JESD204B Intel FPGA IP User Guide

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UG-01142 | 2020.06.30

Version Information

Updated for:
Intel® Quartus® Prime Design Suite 19.4
IP Version 19.2.0

1. JESD204B IP Quick Reference

The JESD204B Intel^® FPGA IP is a high-speed point-to-point serial interface intellectual property (IP).

Note: For system requirements and installation instructions, refer to Intel^® FPGA Software Installation & Licensing.

Table 1. Brief Information About the JESD204B IP
Item	Description
Protocol Features	Joint Electron Device Engineering Council (JEDEC) JESD204B.01, 2012 standard release specification Device subclass: Subclass 0—Backwards compatible to JESD204A. Subclass 1—Uses `SYSREF` signal to support deterministic latency. Subclass 2—Uses `SYNC_N` detection to support deterministic latency.
Core Features	Run-time configuration of parameters L, M, and F Data rate of up to 12.5 gigabits per second (Gbps)—per JESD204B specification Data rate of up to 19.2 Gbps—not certified per JESD204B specification (uncharacterized support) Single or multiple lanes (up to 8 lanes per link) Serial lane alignment and monitoring Lane synchronization Modular design that supports multidevice synchronization MAC and PHY partitioning Deterministic latency support 8B/10B encoding Scrambling/Descrambling Avalon^® Streaming (Avalon-ST) interface for transmit and receive datapaths Avalon^® Memory-Mapped (Avalon-MM) interface for Configuration and Status registers (CSR) Dynamic generation of simulation testbench
Typical Application	Wireless communication equipment Broadcast equipment Military equipment Medical equipment Test and measurement equipment
Device Family Support	Intel^® Agilex™ devices (E-tile) Intel^® Cyclone^® 10 GX FPGA devices Intel^® Stratix^® 10 FPGA devices (L-tile/H-tile/E-tile) Intel^® Arria^® 10 FPGA devices Stratix^® V FPGA devices Arria^® V FPGA devices Arria^® V GZ FPGA devices Cyclone^® V FPGA devices
Design Tools	Platform Designer parameter editor in the Intel^® Quartus^® Prime software for design creation and compilation Timing Analyzer in the Intel^® Quartus^® Prime software for timing analysis ModelSim* - Intel^® FPGA Edition, Riviera-PRO* , VCS* / VCS* MX, NCSim, and Xcelium* Parallel simulator software for design simulation or synthesis

2. About the JESD204B Intel FPGA IP

The JESD204B Intel^® FPGA IP is a high-speed point-to-point serial interface for digital-to-analog (DAC) or analog-to-digital (ADC) converters to transfer data to FPGA devices. This unidirectional serial interface runs at a maximum data rate of 17.4 Gbps. This protocol offers higher bandwidth, low I/O count and supports scalability in both number of lanes and data rates. The JESD204B Intel^® FPGA IP addresses multi-device synchronization by introducing Subclass 1 and Subclass 2 to achieve deterministic latency.

Note: The full product name, JESD204B Intel^® FPGA IP, is shortened to JESD204B IP in this document.

The JESD204B IP incorporates:

Media access control (MAC)—data link layer (DLL) block that controls the link states and character replacement.
Physical layer (PHY)—physical coding sublayer (PCS) and physical media attachment (PMA) block.

The JESD204B IP does not incorporate the Transport Layer (TL) that controls the frame assembly and disassembly. The TL and test components are provided as part of a design example component where you can customize the design for different converter devices.

Figure 1. Typical System Application for JESD204B IP

The JESD204B IP uses the Avalon-ST source and sink interfaces, with unidirectional flow of data, to transmit and receive data on the FPGA fabric interface.

Key features of the JESD204B IP:

Data rate of up to 19.2 Gbps (characterization up to 12.5 G)
Run-time JESD204B parameter configuration (L, M, F, S, N, K, CS, CF)
MAC and PHY partitioning for portability
Subclass 0 mode for backward compatibility to JESD204A
Subclass 1 mode for deterministic latency support (using SYSREF) between the ADC/DAC and logic device
Subclass 2 mode for deterministic latency support (using SYNC_N) between the ADC/DAC and logic device
Multi-device synchronization

2.1. Release Information

IP versions are the same as the Intel^® Quartus^® Prime Design Suite software versions up to v19.1. From Intel^® Quartus^® Prime Design Suite software version 19.2 or later, IP cores have a new IP versioning scheme.

The IP version (X.Y.Z) number may change from one Intel Quartus Prime software version to another. A change in:

X indicates a major revision of the IP. If you update your Intel Quartus Prime software, you must regenerate the IP.
Y indicates the IP includes new features. Regenerate your IP to include these new features.
Z indicates the IP includes minor changes. Regenerate your IP to include these changes.

Table 2. JESD204B IP Release Information
Item	Description
IP Version	19.3.0
Intel^® Quartus^® Prime Version	19.4
Release Date	December 2019
Ordering Code	IP-JESD204B

2.2. Device Family Support

Table 3. Intel Device Family Support
Device Family	Support Level
Intel^® Agilex™ (E-tile)	Advance
Intel^® Stratix^® 10 (E-tile, H-tile, and L-tile)	Final
Intel^® Arria^® 10	Final
Intel^® Cyclone^® 10 GX	Final
Stratix V	Final
Arria V	Final
Cyclone V	Final

The following terms define device support levels for Intel FPGA IP cores:

Advance support—the IP core is available for simulation and compilation for this device family. Timing models include initial engineering estimates of delays based on early post-layout information. The timing models are subject to change as silicon testing improves the correlation between the actual silicon and the timing models. You can use this IP core for system architecture and resource utilization studies, simulation, pinout, system latency assessments, basic timing assessments (pipeline budgeting), and I/O transfer strategy (data-path width, burst depth, I/O standards tradeoffs).
Preliminary support—the IP core is verified with preliminary timing models for this device family. The IP core meets all functional requirements, but might still be undergoing timing analysis for the device family. It can be used in production designs with caution.
Final support—the IP core is verified with final timing models for this device family. The IP core meets all functional and timing requirements for the device family and can be used in production designs.

2.3. Datapath Modes

The JESD204B IP supports TX-only, RX-only, and Duplex (TX and RX) mode. The IP is a unidirectional protocol where interfacing to ADC utilizes the transceiver RX path and interfacing to DAC utilizes the transceiver TX path.

The JESD204B IP generates a single link with a single lane and up to a maximum of 8 lanes. If there are two ADC links that need to be synchronized, you have to generate two JESD204B IP cores and then manage the deterministic latency and synchronization signals, like SYSREF and SYNC_N, at your custom wrapper level.

The JESD204B IP supports duplex mode only if the LMF configuration for ADC (RX) is the same as DAC (TX) and with the same data rate. This use case is mainly for prototyping with internal serial loopback mode. This is because typically as a unidirectional protocol, the LMF configuration of converter devices for both DAC and ADC are not identical.

2.4. IP Variation

The JESD204B IP has three core variations:

JESD204B MAC only
JESD204B PHY only
JESD204B MAC and PHY

In a subsystem where there are multiple ADC and DAC converters, you need to use the Intel^® Quartus^® Prime software to merge the transceivers and group them into the transceiver architecture. For example, to create two instances of the JESD204B TX IP with four lanes each and four instances of the JESD204B RX IP with two lanes each, you can apply one of the following options:

MAC and PHY option
1. Generate JESD204B TX IP with four lanes and JESD204B RX IP with two lanes.
2. Instantiate the desired components.
3. Use the Intel^® Quartus^® Prime software to merge the PHY lanes.
MAC only and PHY only option—based on the configuration above, there are a total of eight lanes in duplex mode.
1. Generate the JESD204B Duplex PHY with a total of eight lanes. (TX skew is reduced in this configuration as the channels are bonded).
2. Generate the JESD204B TX MAC with four lanes and instantiate it two times.
3. Generate the JESD204B RX MAC with two lanes and instantiate it four times.
4. Create a wrapper to connect the JESD204B TX MAC and RX MAC with the JESD204B Duplex PHY.

Note: If the data rate for TX and RX is different, the transceiver does not allow duplex mode to generate a duplex PHY. In this case, you have to generate a RX-only PHY on the RX data rate and a TX-only PHY on the TX data rate.

2.5. JESD204B IP Configuration

Table 5. JESD204B IP Configuration
Symbol	Description	Value
L	Number of lanes per converter device	1-8
M	Number of converters per device	1-256
F	Number of octets per frame	1–256 (for Intel^® Stratix^® 10 devices only) 1, 2, 4–256 (for non Intel^® Stratix^® 10 devices)
S	Number of transmitted samples per converter per frame	1-32
N	Number of conversion bits per converter	1-32
N'	Number of transmitted bits per sample (JESD204 word size, which is in nibble group)	1-32
K	Number of frames per multiframe	17/F ≤ K ≤ 32 ; 1-32
CS	Number of control bits per conversion sample	0-3
CF	Number of control words per frame clock period per link	0-32
HD	High Density user data format	0 or 1
LMFC	Local multiframe clock	(F × K /4) link clock counts ¹

¹ The value of F x K must be divisible by 4.

2.5.1. Run-Time Configuration

The JESD204B IP allows run-time configuration of LMF parameters in all supported devices except for Intel^® Stratix^® 10. For Intel^® Stratix^® 10 devices, the JESD204B IP core must be parameterized according to your target converter device with the IP configurations shown in JESD204B Configurations Tab of Table 15

Note: For Intel^® Stratix^® 10 devices, run-time access for certain registers have been disabled. Refer to the TX and RX register map for more information.

The most critical parameters that must be set correctly during IP generation are the L and F parameters. Parameter L denotes the maximum lanes supported while parameter F denotes the size of the deskew buffer needed for deterministic latency. The hardware generates during parameterization, which means that run-time programmability can only fall back from the parameterized and generated hardware, but not beyond the parameterized IP core.

You can use run-time configuration for prototyping or evaluating the performance of converter devices with various LMF configurations. However, in actual production, Intel^® recommends that you generate the JESD204B IP core with the intended LMF to get an optimized gate count.

For example, if a converter device supports LMF = 442 and LMF = 222, to check the performance for both configurations, you need to generate the JESD204B IP with maximum F and L, which is L = 4 and F = 2. During operation, you can use the fall back configuration to disable the lanes that are not used in LMF = 222 mode. You must ensure that other JESD204B configurations like M, N, S, CS, CF, and HD do not violate the parameter F setting. You can access the Configuration and Status Register (CSR) space to modify other configurations such as:

K (multiframe)
device and lane IDs
enable or disable scrambler
enable or disable character replacement

F Parameter

This parameter indicates how many octets per frame per lane that the JESD204B link is operating in.

Intel^® Agilex™ and Intel^® Stratix^® 10 (L-tile, H-tile, and E-tile) devices support F = 1–256 (F = 3 available)
Intel^® Cyclone^® 10 GX , Intel^® Arria^® 10, Stratix^® V, Arria^® V, Arria^® V GZ, and Cyclone^® V devices support F = 1, 2, 4–256 (F = 3 not available)

To support the High Density (HD) data format, the JESD204B IP tracks the start of frame and end of frame because F can be either an odd or even number. The start of frame and start of multiframe wrap around the 32-bit data width architecture. The RX IP outputs the start of frame (sof[3:0]) and start of multiframe (somf[3:0]), which act as markers, using the Avalon-ST data stream. Based on these markers, the transport layer build the frames.

In a simpler system where the HD data format is set to 0, the F will always be 1, 2, 4, 6, 8, and so forth. This simplifies the transport layer design, so you do not need to use the sof[3:0] and somf[3:0] markers.

2.6. Channel Bonding

The JESD204B IP supports channel bonding—bonded (PMA bonding for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Arria^® 10, and Intel^® Cyclone^® 10 GX) and non-bonded modes.

The channel bonding mode that you select may contribute to the transmitter channel-to-channel skew. A bonded transmitter datapath clocking provides low channel-to-channel skew as compared to non-bonded channel configurations.

For Intel^® Stratix^® 10 L-tile and H-tile, Intel^® Arria^® 10, and Intel^® Cyclone^® 10 GX devices, refer to PMA Bonding chapter of the respective Transceiver PHY User Guides , about how to connect the ATX PLL and fPLL in bonded configuration and non-bonded configuration. For the non-bonded configuration, refer to Implementing Multi-Channel xN Non-Bonded Configuration. For bonded configuration, refer to Implementing x6/xN Bonding Mode.

In PHY-only mode, you can generate up to 32 channels, provided that the channels are on the same side. In MAC and PHY integrated mode, you can generate up to 8 channels.
Note: The maximum channels of 32 is for configuration simplicity. Refer to the Intel^® FPGA Transceiver PHY User Guide for the actual number of channels supported.
In bonded channel configuration, the lower transceiver clock skew for all channels result in a lower channel-to-channel skew.
- For Stratix V, Arria V, and Cyclone V devices, you must use contiguous channels when you select bonded mode. The JESD204B IP automatically selects between ×6, ×N or feedback compensation (fb_compensation) bonding depending on the number of transceiver channels you set.
- For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices, you do not have to place the channels in bonded group contiguously. Refer to Table 7 for the clock network selection. Refer to Channel Bonding section of the respective Transceiver PHY User Guides for more information about PMA Bonding.
- For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, you must use contiguous channels to enable channel bonding with NRZ PMA transceiver channels.
In non-bonded channel configuration, the transceiver clock skew is higher and latency is unequal in the transmitter phase compensation FIFO for each channel. This may result in a higher channel-to-channel skew.

Table 6. Maximum Number of Lanes (L) Supported in Bonded and Non-Bonded Mode
Device Family	Core Variation	Bonding Mode Configuration	Maximum Number of Lanes (L)
Intel^® Agilex™ Intel^® Stratix^® 10 Intel^® Arria^® 10 Intel^® Cyclone^® 10 GX Stratix V Arria V GZ Cyclone V	PHY only	Bonded	32 ²
	PHY only	Non-bonded	32 ²
	MAC and PHY	Bonded	8
	MAC and PHY	Non-bonded	8
Arria V	PHY only	Bonded	32 ²
	PHY only	Non-bonded	32 ²
	MAC and PHY	Bonded	6
	MAC and PHY	Non-bonded	8

Table 7. Clock Network Selection for Bonded Mode
Note: The clock network selection is not applicable for Intel^® Stratix^® 10 E-tile devices.
Device Family	L ≤ 6	L > 6
Intel^® Stratix^® 10 L-tile and H-tile Intel^® Arria^® 10 Intel^® Cyclone^® 10 GX	×6	×N ³
Stratix V	×6	Feedback compensation
Arria V	×N	×N
Arria V GZ	×6	Feedback compensation
Cyclone V	×N	×N

² The maximum lanes listed here is for configuration simplicity. Refer to the Intel^® FPGA Transceiver PHY User Guides for the actual number of channels supported.

³ Bonded mode is not supported for data rate > 15 Gbps. Refer to the respective datasheet for the maximum data rate and channel span supported by the ×N clock network and the transceiver power supply operating condition for your device.

2.7. Performance and Resource Utilization

Table 8. JESD204B Intel^® FPGA IP Performance
Device Family	PMA Speed Grade	FPGA Fabric Speed Grade	Data Rate		Link Clock F_MAX (MHz)
Device Family	PMA Speed Grade	FPGA Fabric Speed Grade	Enable Hard PCS (Gbps)	Enable Soft PCS (Gbps) ⁴	Link Clock F_MAX (MHz)
Intel^® Agilex™ (E-tile)	1	–1	Not supported	2.0 to 19.2	data_rate/40
	2	–2	Not supported	2.0 to 17.4	data_rate/40
	2	–3	Not supported	2.0 to 16.0	data_rate/40
	3	–2	Not supported	2.0 to 17.4	data_rate/40
	3	–3	Not supported	2.0 to 16.0	data_rate/40
Intel^® Stratix^® 10 (L-tile, and H-tile)	1	–1	2.0 to 12.0	2.0 to 16.0⁶	data_rate/40
	1	–2	2.0 to 12.0	2.0 to 14.0	data_rate/40
	2	–1	2.0 to 9.83	2.0 to 16.0⁶	data_rate/40
	2	–2	2.0 to 9.83	2.0 to 14.0	data_rate/40
	3	–1	2.0 to 9.83	2.0 to 16.0⁶	data_rate/40
		–2	2.0 to 9.83	2.0 to 14.0	data_rate/40
		–3	2.0 to 9.83	2.0 to 13.0	data_rate/40
Intel^® Stratix^® 10 (E-tile)	1	–1	Not supported	2.0 to 16.0⁶	data_rate/40
	1	–2	Not supported	2.0 to 14.0	data_rate/40
	2	–1	Not supported	2.0 to 16.0⁶	data_rate/40
	2	–2	Not supported	2.0 to 14.0	data_rate/40
	3	–1	Not supported	2.0 to 16.0	data_rate/40
		–2	Not supported	2.0 to 14.0	data_rate/40
		–3	Not supported	2.0 to 13.0	data_rate/40
Intel^® Arria^® 10	1	–1	2.0 to 12.0	2.0 to 15.0 ⁶ ⁵	data rate/40
	2	–1	2.0 to 12.0	2.0 to 15.0 ⁶ ⁵	data rate/40
	2	–2	2.0 to 9.83	2.0 to 15.0 ⁶ ⁵	data rate/40
	3	–1	2.0 to 12.0	2.0 to 14.2 ⁶ ⁷	data rate/40
	3	–2	2.0 to 9.83	2.0 to 14.2 ⁶ ⁸	data rate/40
	4	–3	2.0 to 8.83	2.0 to 12.5⁹	data rate/40
Intel^® Cyclone^® 10 GX	<Any supported speed grade>	<Any supported speed grade>	2.0 to 6.25	2.0 to 6.25	data rate/40
Stratix V	1	–1 or –2	2.0 to 12.2	2.0 to 12.5	data rate/40
	2	–1 or –2	2.0 to 12.2	2.0 to 12.5	data rate/40
	2	–3	2.0 to 9.8	2.0 to 12.5 ¹⁰	data rate/40
	3	–1, –2, –3, or –4	2.0 to 8.5	2.0 to 8.5	data rate/40
Arria V GX/SX	<Any supported speed grade>	<Any supported speed grade>	1.0 to 6.55	— ¹¹	data rate/40
Arria V GT/ST	<Any supported speed grade>	<Any supported speed grade>	1.0 to 6.55	4.0 to 7.5 (PMA direct) ¹¹	data rate/40
Arria V GZ	2	–3	2.0 to 9.9	— ¹¹	data rate/40
Arria V GZ	3	–4	2.0 to 8.8	— ¹¹	data rate/40
Cyclone V	5	<Any supported speed grade>	1.0 to 5.0	—	data rate/40
Cyclone V	6	–6 or –7	1.0 to 3.125	—	data rate/40

The following table lists the resources and expected performance of the JESD204B IP core. These results are obtained using the Intel^® Quartus^® Prime software targeting the following Intel^® FPGA devices:

Cyclone V: 5CGTFD9E5F31I7
Arria V GT/S/GT: 5AGXFB3H4F35C5
Arria V GZ: 5AGZME5K2F40C3
Stratix V: 5SGXEA7H3F35C3
Intel^® Arria^® 10: 10AX115H2F34I2SGES
Intel^® Stratix^® 10: 1SG280LN3F43E3VG
Intel^® Cyclone^® 10 GX: 10CX105YF672I6G

All the variations for resource utilization are configured with the following parameter settings:

Table 9. Parameter Settings To Obtain the Resource Utilization Data
Parameter	Setting
JESD204B Wrapper	Base and PHY
JESD204B Subclass	1
Data Rate	5 Gbps
PCS Option	Enabled Hard PCS
PLL Type	ATX (for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices) CMU (for Arria V, Cyclone V, and Stratix V devices)
Bonding Mode	Non-bonded
Reference Clock Frequency	125.0 MHz
Octets per frame (F)	1 (For all devices, including Intel^® Stratix^® 10) 3 (For Intel^® Stratix^® 10 device only)
Enable Scrambler (SCR)	Off
Enable Error Code Correction (ECC_EN)	Off

Table 10. JESD204B IP Core Resource Utilization
Note: The resource utilization data are extracted from a full design which includes the Intel^® FPGA Transceiver PHY Reset Controller IP core. Thus, the actual resource utilization for the JESD204B IP core should be smaller by about 15 ALMs and 20 registers.
Device Family	Data Path	Number of Lanes (L)	ALMs	ALUTs	Logic Registers	Memory Block (M10K/M20K) ¹² ¹³
Intel^® Stratix^® 10 (F=1)	RX	1	889.4	1230	1334	0
		2	1329.7	1810	2119	0
		4	2302.8	3101	3634	0
		8	4218.1	5638	6650	0
	TX	1	534.4	694	869	0
		2	746	1061	1078	0
		4	1049.8	1557	1580	0
		8	1534.2	1980	2507	0
Intel^® Stratix^® 10 (F=3)	RX	1	905.1	1336	1453	1
		2	1431.5	2102	2281	2
		4	2445.9	3487	3899	4
		8	4568	6592	6870	8
	TX	1	568.7	737	907	0
		2	790.2	1126	1126	0
		4	1096.4	1659	1545	0
		8	1617.1	2082	2524	0
Intel^® Arria^® 10	RX	1	1047	1496	1264	0
		2	1584	2262	1903	0
		4	2884.5	3870	3211	0
		8	5339	7196	5768	0
	TX	1	701.5	1090	989	0
		2	875.5	1341	1126	0
		4	1248.5	1888	1382	0
		8	1917.5	2820	1878	0
Intel^® Cyclone^® 10 GX	RX	1	1020.5	1496	1250	1
		2	1551.5	2262	1877	2
		4	2801	3870	3159	4
		8	5173.5	7196	5749	8
	TX	1	710	1090	989	0
		2	875.4	1341	1118	0
		4	1249	1888	1369	0
		8	1926.5	2820	1869	0
Stratix V	RX	1	1047.2	1530	1225	0
		2	1608.7	2322	1871	0
		4	2897.2	4037	3161	0
		8	5412.5	7506	5742	0
	TX	1	711	1152	948	0
		2	926.7	1491	1086	0
		4	1345.7	2134	1361	0
		8	2114.7	3358	1907	0
Arria V	RX	1	1024.5	1516	1207	1
		2	1555.5	2302	1838	2
		4	2769.5	3951	3102	4
		8	5189	7399	5619	8
	TX	1	711.7	1149	948	0
		2	860.5	1418	1065	0
		4	1188.7	1932	1299	0
		8	1721	2854	1767	0
Arria V GZ	RX	1	1048.7	1530	1226	0
		2	1601.5	2322	1870	0
		4	2894	4037	3163	0
		8	5400.5	7506	5748	0
	TX	1	712.2	1152	948	0
		2	926.5	1491	1087	0
		4	1349.2	2134	1359	0
		8	2104.7	3358	1907	0
Cyclone V	RX	1	1022	1516	1210	1
		2	1555.5	2302	1839	2
		4	2777.5	3951	3099	4
		8	5195	7399	5619	8
	TX	1	713.5	1149	948	0
		2	867	1418	1066	0
		4	1198	1932	1300	0
		8	1709.2	2838	1769	0

⁴ Select Enable Soft PCS to achieve maximum data rate. For the TX IP core, enabling soft PCS incurs an additional 3–8% increase in resource utilization. For the RX IP core, enabling soft PCS incurs an additional 10–20% increase in resource utilization.

⁵ When using Soft PCS mode at 15.0 Gbps, the timing margin is very limited. You are advised to enable high fitter effort, register duplication, and register retiming to improve timing performance.

⁶ Refer to the Intel^® Arria^® 10 and Intel^® Stratix^® 10 Device Datasheet for the maximum data rate supported across transceiver speed grades and transceiver power supply operating conditions.

⁷ For Intel^® Arria^® 10 GX 160, SX 160, GX 220 and SX 220 devices, the supported data rate is up to 12.288 Gbps.

⁸ For Intel^® Arria^® 10 GX 160, SX 160, GX 220 and SX 220 devices, the supported data rate is 11.0 Gbps.

⁹ For Intel^® Arria^® 10 GX 160, SX 160, GX 220 and SX 220 devices, the supported data rate is 10.0 Gbps.

¹⁰ When using Soft PCS mode at 12.5 Gbps, the timing margin is very limited. You are advised to enable high fitter effort, register duplication, and register retiming to improve timing performance.

¹¹ Enabling Soft PCS does not increase the data rate for the device family and speed grade. You are recommended to select the Enable Hard PCS option.

¹² M10K for Arria V, Cyclone V devices, M20K for Arria V GZ, Stratix V, Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.

¹³

The Intel^® Quartus^® Prime software may auto-fit to use MLAB when the memory size is too small. Conversion from MLAB to M20K or M10K was performed for the numbers listed above.

3. Getting Started

3.1. Introduction to Intel FPGA IP Cores

Intel and strategic IP partners offer a broad portfolio of configurable IP cores optimized for Intel FPGA devices.

The Intel^® Quartus^® Prime software installation includes the Intel^® FPGA IP library. Integrate optimized and verified Intel^® FPGA IP cores into your design to shorten design cycles and maximize performance. The Intel^® Quartus^® Prime software also supports integration of IP cores from other sources. Use the IP Catalog (Tools > IP Catalog) to efficiently parameterize and generate synthesis and simulation files for your custom IP variation. The Intel^® FPGA IP library includes the following types of IP cores:

Basic functions
DSP functions
Interface protocols
Low power functions
Memory interfaces and controllers
Processors and peripherals

This document provides basic information about parameterizing, generating, upgrading, and simulating stand-alone IP cores in the Intel^® Quartus^® Prime software.

Figure 2. IP Catalog

3.2. Installing and Licensing Intel FPGA IP Cores

The Intel^® Quartus^® Prime software installation includes the Intel^® FPGA IP library. This library provides many useful IP cores for your production use without the need for an additional license. Some Intel^® FPGA IP cores require purchase of a separate license for production use. The Intel^® FPGA IP Evaluation Mode allows you to evaluate these licensed Intel^® FPGA IP cores in simulation and hardware, before deciding to purchase a full production IP core license. You only need to purchase a full production license for licensed Intel^® IP cores after you complete hardware testing and are ready to use the IP in production.

The Intel^® Quartus^® Prime software installs IP cores in the following locations by default:

Figure 3. IP Core Installation Path

Table 11. IP Core Installation Locations
Location	Software	Platform
`<drive>`:\intelFPGA_pro\quartus\ip\altera	Intel^® Quartus^® Prime Pro Edition	Windows*
`<drive>`:\intelFPGA\quartus\ip\altera	Intel^® Quartus^® Prime Standard Edition	Windows
`<home directory>`:/intelFPGA_pro/quartus/ip/altera	Intel^® Quartus^® Prime Pro Edition	Linux*
`<home directory>`:/intelFPGA/quartus/ip/altera	Intel^® Quartus^® Prime Standard Edition	Linux

Note: The Intel^® Quartus^® Prime software does not support spaces in the installation path.

3.3. Intel FPGA IP Evaluation Mode

The free Intel^® FPGA IP Evaluation Mode allows you to evaluate licensed Intel^® FPGA IP cores in simulation and hardware before purchase. Intel^® FPGA IP Evaluation Mode supports the following evaluations without additional license:

Simulate the behavior of a licensed Intel^® FPGA IP core in your system.
Verify the functionality, size, and speed of the IP core quickly and easily.
Generate time-limited device programming files for designs that include IP cores.
Program a device with your IP core and verify your design in hardware.

Intel^® FPGA IP Evaluation Mode supports the following operation modes:

Tethered—Allows running the design containing the licensed Intel^® FPGA IP indefinitely with a connection between your board and the host computer. Tethered mode requires a serial joint test action group (JTAG) cable connected between the JTAG port on your board and the host computer, which is running the Intel^® Quartus^® Prime Programmer for the duration of the hardware evaluation period. The Programmer only requires a minimum installation of the Intel^® Quartus^® Prime software, and requires no Intel^® Quartus^® Prime license. The host computer controls the evaluation time by sending a periodic signal to the device via the JTAG port. If all licensed IP cores in the design support tethered mode, the evaluation time runs until any IP core evaluation expires. If all of the IP cores support unlimited evaluation time, the device does not time-out.
Untethered—Allows running the design containing the licensed IP for a limited time. The IP core reverts to untethered mode if the device disconnects from the host computer running the Intel^® Quartus^® Prime software. The IP core also reverts to untethered mode if any other licensed IP core in the design does not support tethered mode.

When the evaluation time expires for any licensed Intel^® FPGA IP in the design, the design stops functioning. All IP cores that use the Intel^® FPGA IP Evaluation Mode time out simultaneously when any IP core in the design times out. When the evaluation time expires, you must reprogram the FPGA device before continuing hardware verification. To extend use of the IP core for production, purchase a full production license for the IP core.

You must purchase the license and generate a full production license key before you can generate an unrestricted device programming file. During Intel^® FPGA IP Evaluation Mode, the Compiler only generates a time-limited device programming file (<project name> _time_limited.sof) that expires at the time limit.

Figure 4. Intel^® FPGA IP Evaluation Mode Flow

Note: Refer to each IP core's user guide for parameterization steps and implementation details.

Intel^® licenses IP cores on a per-seat, perpetual basis. The license fee includes first-year maintenance and support. You must renew the maintenance contract to receive updates, bug fixes, and technical support beyond the first year. You must purchase a full production license for Intel^® FPGA IP cores that require a production license, before generating programming files that you may use for an unlimited time. During Intel^® FPGA IP Evaluation Mode, the Compiler only generates a time-limited device programming file (<project name> _time_limited.sof) that expires at the time limit. To obtain your production license keys, visit the Self-Service Licensing Center.

The Intel^® FPGA Software License Agreements govern the installation and use of licensed IP cores, the Intel^® Quartus^® Prime design software, and all unlicensed IP cores.

3.4. Upgrading IP Cores

Any Intel^® FPGA IP variations that you generate from a previous version or different edition of the Intel^® Quartus^® Prime software, may require upgrade before compilation in the current software edition or version. The Project Navigator displays a banner indicating the IP upgrade status. Click Launch IP Upgrade Tool or Project > Upgrade IP Components to upgrade outdated IP cores.

Figure 5. IP Upgrade Alert in Project Navigator

Icons in the Upgrade IP Components dialog box indicate when IP upgrade is required, optional, or unsupported for an IP variation in the project. Upgrade IP variations that require upgrade before compilation in the current version of the Intel^® Quartus^® Prime software.

Note: Upgrading IP cores may append a unique identifier to the original IP core entity names, without similarly modifying the IP instance name. There is no requirement to update these entity references in any supporting Intel^® Quartus^® Prime file, such as the Intel^® Quartus^® Prime Settings File (.qsf), Synopsys* Design Constraints File (.sdc), or Signal Tap File (.stp), if these files contain instance names. The Intel^® Quartus^® Prime software reads only the instance name and ignores the entity name in paths that specify both names. Use only instance names in assignments.

Table 12. IP Core Upgrade Status
IP Core Status	Description
IP Upgraded	Indicates that your IP variation uses the latest version of the Intel^® FPGA IP core.
IP Component Outdated	Indicates that your IP variation uses an outdated version of the IP core.
IP Upgrade Optional	Indicates that upgrade is optional for this IP variation in the current version of the Intel^® Quartus^® Prime software. You can upgrade this IP variation to take advantage of the latest development of this IP core. Alternatively, you can retain previous IP core characteristics by declining to upgrade. Refer to the Description for details about IP core version differences. If you do not upgrade the IP, the IP variation synthesis and simulation files are unchanged and you cannot modify parameters until upgrading.
IP Upgrade Required	Indicates that you must upgrade the IP variation before compiling in the current version of the Intel^® Quartus^® Prime software. Refer to the Description for details about IP core version differences.
IP Upgrade Unsupported	Indicates that upgrade of the IP variation is not supported in the current version of the Intel^® Quartus^® Prime software due to incompatibility with the current version of the Intel^® Quartus^® Prime software. The Intel^® Quartus^® Prime software prompts you to replace the unsupported IP core with a supported equivalent IP core from the IP Catalog. Refer to the Description for details about IP core version differences and links to Release Notes.
IP End of Life	Indicates that Intel designates the IP core as end-of-life status. You may or may not be able to edit the IP core in the parameter editor. Support for this IP core discontinues in future releases of the Intel^® Quartus^® Prime software.
IP Upgrade Mismatch Warning	Provides warning of non-critical IP core differences in migrating IP to another device family.
IP has incompatible subcores	Indicates that the current version of the Intel^® Quartus^® Prime software does not support compilation of your IP variation, because the IP has incompatible subcores
Compilation of IP Not Supported	Indicates that the current version of the Intel^® Quartus^® Prime software does not support compilation of your IP variation. This can occur if another edition of the Intel^® Quartus^® Prime software, such as the Intel^® Quartus^® Prime Standard Edition, generated this IP. Replace this IP component with a compatible component in the current edition.

Follow these steps to upgrade IP cores:

In the latest version of the Intel^® Quartus^® Prime software, open the Intel^® Quartus^® Prime project containing an outdated IP core variation. The Upgrade IP Components dialog box automatically displays the status of IP cores in your project, along with instructions for upgrading each core. To access this dialog box manually, click Project > Upgrade IP Components.
To upgrade one or more IP cores that support automatic upgrade, ensure that you turn on the Auto Upgrade option for the IP cores, and click Auto Upgrade. The Status and Version columns update when upgrade is complete. Example designs that any Intel^® FPGA IP core provides regenerate automatically whenever you upgrade an IP core.
To manually upgrade an individual IP core, select the IP core and click Upgrade in Editor (or simply double-click the IP core name). The parameter editor opens, allowing you to adjust parameters and regenerate the latest version of the IP core.

Figure 6. Upgrading IP Cores

Note: Intel^® FPGA IP cores older than Intel^® Quartus^® Prime software version 12.0 do not support upgrade. Intel verifies that the current version of the Intel^® Quartus^® Prime software compiles the previous two versions of each IP core. The Intel^® FPGA IP Core Release Notes reports any verification exceptions for Intel^® FPGA IP cores. Intel does not verify compilation for IP cores older than the previous two releases.

3.5. IP Catalog and Parameter Editor

The IP Catalog displays the IP cores available for your project, including Intel^® FPGA IP and other IP that you add to the IP Catalog search path.. Use the following features of the IP Catalog to locate and customize an IP core:

Filter IP Catalog to Show IP for active device family or Show IP for all device families. If you have no project open, select the Device Family in IP Catalog.
Type in the Search field to locate any full or partial IP core name in IP Catalog.
Right-click an IP core name in IP Catalog to display details about supported devices, to open the IP core's installation folder, and for links to IP documentation.
Click Search for Partner IP to access partner IP information on the web.

The parameter editor prompts you to specify an IP variation name, optional ports, and output file generation options. The parameter editor generates a top-level Intel^® Quartus^® Prime IP file (.ip) for an IP variation in Intel^® Quartus^® Prime Pro Edition projects or Quartus IP file (.qip) for an IP variation in Intel^® Quartus^® Prime Standard Edition projects.

3.6. Design Walkthrough

This walkthrough explains how to create a JESD204B IP core design using Platform Designer in the Intel^® Quartus^® Prime software. After you generate a custom variation of the JESD204B IP core, you can incorporate it into your overall project.

3.6.1. Creating a New Intel Quartus Prime Project

You can create a new Intel^® Quartus^® Prime project with the New Project Wizard. Creating a new project allows you to do the following:

Specify the working directory for the project.
Assign the project name.
Designate the name of the top-level design entity.

Launch the Intel^® Quartus^® Prime software.
On the File menu, click New Project Wizard.
In the New Project Wizard: Directory, Name, Top-Level Entity page, specify the working directory, project name, and top-level design entity name. Click Next.
In the New Project Wizard: Add Files page, select the existing design files (if any) you want to include in the project.¹⁴ Click Next.
In the New Project Wizard: Family & Device Settings page, select the device family and specific device you want to target for compilation. Click Next.
In the EDA Tool Settings page, select the EDA tools you want to use with the Intel^® Quartus^® Prime software to develop your project.
Review the summary of your chosen settings in the New Project Wizard window, then click Finish to complete the Intel^® Quartus^® Prime project creation.

¹⁴ To include existing files, you must specify the directory path to where you installed the JESD204B IP core. You must also add the user libraries if you installed the IP core Library in a different directory from where you installed the Intel^® Quartus^® Prime software.

3.6.2. Parameterizing and Generating the IP

Refer to Table 15 for the IP core parameter values and description.

In the IP Catalog (Tools > IP Catalog), locate and double-click the JESD204B Intel^® FPGA IP.
Specify a top-level name for your custom IP variation. This name identifies the IP core variation files in your project. If prompted, also specify the target Intel^® FPGA device family and output file HDL preference. Click OK.
In the Main tab, set the following options:
- Jesd204b wrapper
- Data path
- Jesd204b subclass
- Data Rate
- Transceiver Tile
- PCS Option
- PLL Type
- Bonding Mode
- PLL/CDR Reference Clock Frequency
- Enable Bit reversal and Byte reversal
- Enable Transceiver Dynamic Reconfiguration
- Enable Native PHY Debug Master Endpoint
- Enable Capability Registers
- Set user-defined IP identifier
- Enable Control and Status Registers
- Enable PRBS Soft Accumulators
In the Jesd204b Configurations tab, select the following configurations:
- Common configurations (L, M, Enable manual F configuration, F, N, N', S, K)
- Advanced configurations (SCR, CS, CF, HD, ECC_EN, PHADJ, ADJCNT, ADJDIR)
In the Configurations and Status Registers tab, set the following configurations:
- Device ID
- Bank ID
- Lane ID
- Lane checksum
After parameterizing the core, go to the Example Design tab and click Generate Example Design to create the simulation testbench. Skip to 8 if you do not want to generate the design example.
Set a name for your <example_design_directory> and click OK to generate supporting files and scripts.
The testbench and scripts are located in the <example_design_directory>/ip_sim folder.
The Generate Example Design option generates supporting files for the following entities:
- IP core for simulation—refer to Generating and Simulating the IP Testbench
- IP core design example for simulation—refer to Generating and Simulating the Design Example section in the respective design example user guides.
- IP core design example for synthesis—refer to Compiling the JESD204B IP Core Design Example section in the respective design example user guides.
Click Finish or Generate HDL to generate synthesis and other optional files matching your IP variation specifications. The parameter editor generates the top-level .ip, .qip or .qsys IP variation file and HDL files for synthesis and simulation.

The top-level IP variation is added to the current Intel^® Quartus^® Prime project. Click Project > Add/Remove Files in Project to manually add a .qip or .qsys file to a project. Make appropriate pin assignments to connect ports.

Note: Some parameter options are grayed out if they are not supported in a selected configuration or it is a derived parameter.

3.6.3. Compiling the JESD204B IP Core Design

Refer to the JESD204B IP Design Considerations before compiling the JESD204B IP core design.

To compile your design, click Start Compilation on the Processing menu in the Intel^® Quartus^® Prime software. You can use the generated .ip or .qip file to include relevant files into your project.

3.6.4. Programming an FPGA Device

After successfully compiling your design, program the targeted Intel^® device with the Intel^® Quartus^® Prime Programmer and verify the design in hardware. For instructions on programming the FPGA device, refer to the Device Programming section in the Intel^® Quartus^® Prime Handbook.

3.7. JESD204B Design Examples

The JESD204B IP offers design examples that you can generate through the IP catalog in the Intel^® Quartus^® Prime software.

For detailed information about the JESD204B design examples, refer to following user guides:

3.8. JESD204B IP Design Considerations

You must be aware of the following conditions when integrating the JESD204B IP in your design:

Integrating the IP in Platform Designer
Pin assignments
Adding external transceiver PLL
Timing constraints for the input clock

3.8.1. Integrating the JESD204B IP in Platform Designer

You can integrate the JESD204B IP with other Platform Designer components within Platform Designer.

You can connect standard interfaces like clock, reset, Avalon-MM, Avalon-ST, HSSI bonded clock, HSSI serial clock, and interrupt interfaces within Platform Designer. However, for conduit interfaces, you are advised to export all those interfaces and handle them outside of Platform Designer. ¹⁵ This is because conduit interfaces are not part of the standard interfaces. Thus, there is no guarantee on compatibility between different conduit interfaces.

Note: The Transport Layer provided in this JESD204B IP design example is not supported in Platform Designer. Therefore, you must export all interfaces that connect to the Transport Layer (for example, jesd204_tx_link interface) and connect them to a transport layer outside of Platform Designer.

Figure 7. Example of Connecting JESD204B IP with Other Platform Designer Components in Platform Designer Figure shows an example of how you connect the IP with other Platform Designer components in Platform Designer.

¹⁵ You can also connect conduit interfaces within Platform Designer but you must create adapter components to handle all the incompatibility issues like incompatible signal type and width.

3.8.2. Pin Assignments

Set the pin assignments before you compile to provide direction to the Intel^® Quartus^® Prime software Fitter tool. You must also specify the signals that should be assigned to device I/O pins.

You can create virtual pins to avoid making specific pin assignments for top-level signals. This is useful when you want to perform compilation, but are not ready to map the design to hardware. Intel^® recommends that you create virtual pins for all unused top-level signals to improve timing closure.

Note: Do not create virtual pins for the clock or reset signals.

For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, use the E-Tile Channel Placement Tool to get a valid pinout. Specify the transceiver mode as PMA direct - NRZ.

3.8.3. Adding External Transceiver PLLs

The JESD204B IP core variations that target an Intel^® Stratix^® 10 L-tile, Intel^® Stratix^® 10 H-tile, Intel^® Arria^® 10, or Intel^® Cyclone^® 10 GX FPGA device, require external transceiver PLLs for compilation. Select medium bandwidth for the PLL settings.

Note: For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, the transceiver PLL is within the transceiver itself; so the design does not require external PLLs.

JESD204B IP variations that target an Arria V, Cyclone V, or Stratix V FPGA device contain transceiver PLLs. Therefore, no external PLLs are required for compilation.

Intel recommends that you follow the PLL recommendations in the respective Transceiver PHY user guides based on the data rates.

Note: The PMA width is 20 bits for Hard PCS and 40 bits for Soft PCS.

3.8.4. Timing Constraints For Input Clocks

When you generate the JESD204B IP variation, the Intel^® Quartus^® Prime software generates a Synopsys Design Constraints File (.sdc) that specifies the timing constraints for the input clocks to your IP.

When you generate the JESD204B IP, your design is not yet complete and the JESD204B IP is not yet connected in the design. The final clock names and paths are not yet known. Therefore, the Intel^® Quartus^® Prime software cannot incorporate the final signal names in the .sdc file that it automatically generates. Instead, you must manually modify the clock signal names in this file to integrate these constraints with the timing constraints for your full design.

This section describes how to integrate the timing constraints that the Intel^® Quartus^® Prime software generates with your IP into the timing constraints for your design.

The Intel^® Quartus^® Prime software automatically generates the altera_jesd204.sdc file that contains the JESD204B IP's timing constraints.

Three clocks are created at the input clock port:

JESD204B TX IP:
- txlink_clk
- reconfig_to_xcvr[0] (for Arria V, Cyclone V, and Stratix V devices only)
- reconfig_clk (for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices only)
- tx_avs_clk

JESD204B RX IP:
- rxlink_clk
- reconfig_to_xcvr[0] (for Arria V, Cyclone V, and Stratix V devices only)
- reconfig_clk (for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices only)
- rx_avs_clk

In a functional system design, these clocks (except for reconfig_to_xcvr[0] clock) are typically provided by the core PLL.

In the .sdc file for your project, make the following command changes:

Specify the PLL clock reference pin frequency using the create_clock command.
Derive the PLL generated output clocks from the PLL Intel^® FPGA IP (for Arria V, Cyclone V and Stratix V) or IOPLL Intel^® FPGA IP (for Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX) using the derive_pll_clocks command.
For Intel^® Stratix^® 10 devices, Intel^® FPGA IOPLL IP core has SDC file which derives the PLL clocks based on your PLL configurations. You need not add the derive_pll_clocks command into your top level SDC file."
Comment out the create_clock commands for the txlink_clk, reconfig_to_xcvr[0] or reconfig_clk, and tx_avs_clk, rxlink_clk, and rx_avs_clk clocks in the altera_jesd204.sdc file.
Identify the base and generated clock name that correlates to the txlink_clk, reconfig_clk, and tx_avs_clk, rxlink_clk, and rx_avs_clk clocks using the report_clock command.
Describe the relationship between base and generated clocks in the design using the set_clock_groups command.

After you complete your design, you must modify the clock names in your .sdc file to the full-design clock names, taking into account both the IP instance name in the full design, and the design hierarchy. Be careful when adding the timing exceptions based on your design, for example, when the JESD204B IP handles asynchronous timing between the txlink_clk, rxlink_clk, pll_ref_clk, tx_avs_clk, rx_avs_clk, and reconfig_clk (for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 only) clocks.

The table below shows an example of clock names in the altera_jesd204.sdc and input clock names in the user design. In this example, there is a dedicated input clock for the transceiver TX PLL and CDR at the refclk pin. The device_clk is the input to the core PLL clkin pin. The IP and transceiver Avalon-MM interfaces have separate external clock sources with different frequencies.

Table 13. Example A
Original clock names in altera_jesd204.sdc	User design input clock names	Frequency (MHz)	Recommended SDC timing constraint
tx_pll_ref_clk	xcvr_tx_rx_refclk	250	create_clock -name xcvr_tx_rx_refclk -period 4.0 [get_ports xcvr_tx_rx_refclk ] create_clock -name device_clk -period 8.0 [get_ports device_clk] create_clock -name jesd204_avs_clk -period 10.0 [get_ports jesd204_avs_clk] create_clock -name phy_mgmt_clk -period 13.3 [get_ports phy_mgmt_clk] derive_pll_clocks set_clock_groups -asynchronous \ -group {xcvr_tx_rx_refclk \ <base and generated clock names as reported by report_clock commands> \ } \ -group {device_clk \ <base and generated clock names as reported by report_clock commands> \ } \ -group {jesd204_avs_clk} \ -group {phy_mgmt_clk \ <base and generated clock names as reported by report_clock commands> \ }
rx_pll_ref_clk	xcvr_tx_rx_refclk	250
txlink_clk	device_clk	125
rxlink_clk	device_clk	125
tx_avs_clk	jesd204_avs_clk	100
rx_avs_clk	jesd204_avs_clk	100
reconfig_clk ¹⁶	phy_mgmt_clk	75

However, if your design requires you to connect the rx_avs_clk and reconfig_clk to the same clock, you need to put them in the same clock group.

The table below shows an example where the device_clk in this design is an input into the transceiver refclk pin. The IP's Avalon-MM interface shares the same clock source as the transceiver management clock.

Table 14. Example B
Original clock names in altera_jesd204.sdc	User design input clock names	Frequency (MHz)	Recommended SDC timing constraint
tx_pll_ref_clk	device_clk	125	create_clock -name device_clk -period 8.0 [get_ports device_clk] create_clock -name mgmt_clk -period 10.0 [get_ports mgmt_clk] derive_pll_clocks set_clock_groups -asynchronous \ -group {device_clk \ <base and generated clock names as reported by report_clock commands> \ } \ -group {mgmt_clk \ <base and generated clock names as reported by report_clock commands> \ }
rx_pll_ref_clk
txlink_clk
rxlink_clk
tx_avs_clk	mgmt_clk	100
rx_avs_clk
reconfig_clk ¹⁷

¹⁶ For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 only.

¹⁷ For Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 only.

3.9. JESD204B Intel FPGA IP Parameters

Table 15. JESD204B Intel^® FPGA IP Parameters
Parameter	Value	Description
Main Tab
Device Family	Intel^® Agilex™ Intel^® Stratix^® 10 Intel^® Arria^® 10 Intel^® Cyclone^® 10 GX Stratix V Cyclone V Arria V Arria V GZ	The targeted device family.
JESD204B Wrapper	Base Only PHY Only Both Base and PHY	Select the JESD204B wrapper. Base Only—generates the DLL only. PHY Only—generates the transceiver PHY layer only (soft and hard PCS). Both Base and PHY—generates both DLL and transceiver PHY layers.
Data Path	Receiver Transmitter Duplex	Select the operation modes. This selection enables or disables the receiver and transmitter supporting logic. RX—instantiates the receiver to interface to the ADC. TX—instantiates the transmitter to interface to the DAC. Duplex—instantiates the receiver and transmitter to interface to both the ADC and DAC.
JESD204B Subclass	0 1 2	Select the JESD204B subclass modes. 0—Set subclass 0 1—Set subclass 1 2—Set subclass 2
Data Rate	1.0–19.2	Set the data rate for each lane. Intel^® Agilex™ (E-tile)—2.0 Gbps to 19.2 Gbps Intel^® Stratix^® 10 (L-tile, H-tile, and E-tile)—2.0 Gbps to 16.0 Gbps Intel^® Cyclone^® 10 GX—2.0 Gbps to 6.25 Gbps Intel^® Arria^® 10—2.0 Gbps to 15.0 Gbps Stratix V—2.0 Gbps to 12.5 Gbps Cyclone V—1.0 Gbps to 5.0 Gbps Arria V—1.0 Gbps to 7.5 Gbps Arria V GZ—2.0 Gbps to 9.9 Gbps Note: The maximum data rate is limited due to different device speed grades, transceiver PMA speed grades, and PCS options. Refer to Performance and Resource Utilization for the maximum data rate support.
Transceiver Tile	E-tile H-tile	This option is available only when you target an Intel^® Stratix^® 10 device that supports both H-tile and E-tile. Select the transceiver tile you want for your design. When you select E-tile, you can only use soft PCS. Note: For simplex variants with E-tile transceiver, the underneath transceiver is in duplex mode. The merging of independent TX and RX within a transceiver channel is not supported in this version.
PCS Option	Enabled Hard PCS Enabled Soft PCS Enabled PMA Direct	Select the PCS modes. Enabled Hard PCS—use Hard PCS components. Select this option to minimize resource utilization with data rate that supports up to the limitation of the Hard PCS. Note: For this setting, use 8G PCS mode with 20 bits PMA width and 32-bit PCS width. Enabled Soft PCS—use Soft PCS components. Select this option to allow higher supported data rate but increases the resource utilization. This option is applicable for all devices except Cyclone V and Arria V GT/ST. Note: For this setting, use 10G PCS mode with 40 bits PMA width and 40 bits PCS width. Enabled PMA Direct—Native PHY is set to PMA Direct mode. Select this option to allow the highest supported data rate and to maximize the resource utilization. This option is applicable only for Arria V GT/ST devices. Note: For this setting, use PMA Direct mode with 80-bit PMA width.
PLL Type	CMU ATX	Select the phase-locked loop (PLL) types, depending on the FPGA device family. This parameter is not applicable to Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices. Cyclone V—CMU Arria V—CMU Stratix V—CMU, ATX
Bonding Mode	Bonded Non-bonded	Select the bonding modes. Bonded—select this option to minimize inter-lanes skew for the transmitter datapath. Non-bonded—select this option to disable inter-lanes skew control for the transmitter datapath. Note: For Stratix V, Arria V, and Cyclone V devices, the bonding type is automatically selected based on the device family and number of lanes that you set.
PLL/CDR Reference Clock Frequency	Variable	Set the transceiver reference clock frequency for PLL or CDR. For Stratix V, Arria V, and Cyclone V devices, the frequency range available for you to choose depends on the PLL type and data rate that you select. For Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices, the frequency range available for you to choose depends on the data rate.
VCCR_GXB and VCCT_GXB Supply Voltage for the Transceiver	1.1V 1.0V	Select the supply voltage for the transceiver. For details about the minimum, typical, and maximum supply voltage specifications, refer to the Intel Stratix 10 Device Datasheet. Note: Available only for Intel^® Stratix^® 10 L-tile and H-tile devices.
Enable Bit reversal and Byte reversal	On, Off	The JESD204B IP uses four 10-bit symbols (denoted as symbol3, symbol2, symbol1, and symbol0) for the 8B/10B encoding scheme. Symbol0 is the first symbol to be shifted out through the serial link while symbol3 is the last symbol to be shifted out. Turn off this option to set the data transmission order to start from the least significant bit (lsb) of each symbol. For example, symbol0[0] is shifted out first, followed by symbol0[1], and so on until the entire symbol0 is shifted out. The transmission continues with symbol1[0] through symbol3[9]. Turn on this option to set the data transmission order to start from the most significant bit (lsb) of each symbol. For example, symbol0[9] is shifted out first, followed by symbol0[8], and so on until the entire symbol0 is shifted out. The transmission continues with symbol1[9] through symbol3[0].
Enable Transceiver Dynamic Reconfiguration	On, Off	Turn on this option to enable dynamic data rate change. For V series devices, when you enable this option, you need to connect the reconfiguration interface to the transceiver reconfiguration controller. ¹⁸ For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices, turn on this option to enable the Transceiver Native PHY reconfiguration interface.
Enable Native PHY Debug Master Endpoint ¹⁹	On, Off	Turn on this option for the Transceiver Native PHY IP core to include an embedded Native PHY Debug Master Endpoint. This block connects internally to the Avalon-MM slave interface of the Transceiver Native PHY and can access the reconfiguration space of the transceiver. It can perform certain test and debug functions via JTAG using System Console. This parameter is valid only when you turn on the Enable Transceiver Dynamic Reconfiguration parameter. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
Share Reconfiguration Interface ¹⁹	On, Off	When enabled, Transceiver Native PHY presents a single Avalon-MM slave interface for dynamic reconfiguration of all channels. In this configuration the upper address bits ( Intel^® Stratix^® 10: [log₂<L>+10:11]; Intel^® Arria^® 10/ Intel^® Cyclone^® 10 GX: [log₂<L>+9:10]) of the reconfiguration address bus specify the selected channel. The upper address bits only exist when L>1. Address bits ( Intel^® Stratix^® 10: [10:0]; Intel^® Arria^® 10/ Intel^® Cyclone^® 10 GX: [9:0]) provide the register offset address within the reconfiguration space of the selected channel. L is the number of channel. When disabled, the Native PHY IP core provides an independent reconfiguration interface for each channel. For example, when a reconfiguration interface is not shared for a four-channel Native PHY IP instance, `reconfig_address[9:0]` corresponds to the reconfiguration address bus of logical channel 0, `reconfig_address[19:10]` correspond to the reconfiguration address bus of logical channel 1, `reconfig_address[29:20]` corresponds to the reconfiguration address bus of logical channel 2, and `reconfig_address[39:30]` correspond to the reconfiguration address bus of logical channel 3. For configurations using more than one channel, this option must be enabled when you turn on Enable Native PHY Debug Master Endpoint. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
Provide Separate Reconfiguration Interface for Each Channel	On, Off	When enabled, transceiver dynamic reconfiguration interface presents separate clock, reset, and Avalon-MM slave interface for each channel instead of a single wide bus. This option is only available when Share Reconfiguration Interface is turned off. Note: Available in Intel^® Quartus^® Prime Pro Edition only.
Enable Capability Registers ¹⁹	On, Off	Turn on this option to enable capability registers, which provides high level information about the transceiver channel's configuration. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
Set user-defined IP identifier	0–255	Set a user-defined numeric identifier that can be read from the user identifier offset when you turn on the Enable Capability Registers parameter. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
Enable Control and Status Registers ¹⁹	On, Off	Turn on this option to enable soft registers for reading status signals and writing control signals on the PHY interface through the embedded debug. For more information, refer to the respective Transceiver User Guides. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
Enable PRBS Soft Accumulators ¹⁹	On, Off	Turn on this option to set the soft logic to perform pseudorandom binary sequence (PRBS) bit and error accumulation when using the hard PRBS generator and checker. Note: Available only for Intel^® Agilex™ , Intel^® Stratix^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Arria^® 10 devices.
JESD204B Configurations Tab
Lanes per converter device (L)	1–8	Set the number of lanes per converter device. Note: Refer to Performance and Resource Utilization for the common supported range for L and the resource utilization.
Converters per device (M)	1–256	Set the number of converters per converter device.
Enable manual F configuration	On, Off	Turn on this option to set parameter F in manual mode and enable this parameter to be configurable. Otherwise, the parameter F is in derived mode. You have to enable this parameter and configure the appropriate F value if the transport layer in your design is supporting Control Word (CF) or High Density format(HD), or both. Note: The auto derived F value using formula F=MSN\'/(8*L) may not apply if parameter CF or parameter HD, or both are enabled.
Octets per frame (F)	1–256 (for Intel^® Stratix^® 10 devices only) 1, 2, 4–256 (for non Intel^® Stratix^® 10 devices)	The number of octets per frame is derived from F= MN'S/(8*L).
Converter resolution (N)	1–32	Set the number of conversion bits per converter.
Transmitted bits per sample (N')	1–32	Set the number of transmitted bits per sample (JESD204 word size, which is in nibble group). Note: If parameter CF equals to 0 (no control word), parameter N' must be larger than or equal to sum of parameter N and parameter CS (N' ≥ N + CS). Otherwise, parameter N' must be larger than or equal to parameter N (N'≥N).
Samples per converter per frame (S)	1–32	Set the number of transmitted samples per converter per frame.
Frames per multiframe (K)	1–32	Set the number of frames per multiframe. This value is dependent on the value of F and is derived using the following constraints: The value of K must fall within the range of 17/F <= K <= min(32, floor (1024/F)) The value of F*K must be divisible by 4
Enable scramble (SCR)	On, Off	Turn on this option to scramble the transmitted data or descramble the receiving data.
Control Bits (CS)	0–3	Set the number of control bits per conversion sample.
Control Words (CF)	0–32	Set the number of control words per frame clock period per link.
High density user data format (HD)	On, Off	Turn on this option to set the data format. This parameter controls whether a sample may be divided over more lanes. On: High Density format Off: Data should not cross the lane boundary
Enable Error Code Correction (ECC_EN)	On, Off	Turn on this option to enable error code correction (ECC) for memory blocks.
Phase adjustment request (PHADJ)	On, Off	Turn on this option to specify the phase adjustment request to the DAC. On: Request for phase adjustment Off: No phase adjustment This parameter is valid for Subclass 2 mode only.
Adjustment resolution step count (ADJCNT)	0–15	Set the adjustment resolution for the DAC LMFC. This parameter is valid for Subclass 2 mode only.
Direction of adjustment (ADJDIR)	Advance Delay	Select to adjust the DAC LMFC direction. This parameter is valid for Subclass 2 mode only.
Configurations and Status Registers Tab
Device ID	0–255	Set the device ID number.
Bank ID	0–15	Set the device bank ID number.
Lane# ID	0–31	Set the lane ID number.
Lane# checksum	0–255	Set the checksum for each lane ID.

Note: The PMA Adaptation parameters are available only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices. For more information about the PMA Adaptation parameters, refer to the PMA Adaptation section in the E-tile Transceiver PHY User Guide.

¹⁸ To perform dynamic reconfiguration, you have to instantiate the Transceiver Reconfiguration Controller from the IP Catalog and connect it to the JESD204B IP core through the reconfig_to_xcvr and reconfig_from_xcvr interface.

¹⁹ To support the Transceiver Toolkit in your design, you must turn on this option.

3.10. JESD204B IP Component Files

The following table describes the generated files and other files that may be in your project directory. The names and types of generated files specified may vary depending on whether you create your design with VHDL or Verilog HDL.

Table 16. Generated Files
Extension	Description
<variation name>.v or .vhd	IP variation file, which defines a VHDL or Verilog HDL description of the custom IP. Instantiate the entity defined by this file inside of your design. Include this file when compiling your design in the Intel^® Quartus^® Prime software.
<variation name>.cmp	A VHDL component declaration file for the IP variation. Add the contents of this file to any VHDL architecture that instantiates the IP.
<variation name>.sdc	Contains timing constraints for your IP variation.
<variation name>.qip or .ip	Contains Intel^® Quartus^® Prime project information for your IP variation.
<variation name>.tcl	Tcl script file to run in Intel^® Quartus^® Prime software.
<variation name>.sip	Contains IP library mapping information required by the Intel^® Quartus^® Prime software.The Intel^® Quartus^® Prime software generates a . sip file during generation of some Intel^® FPGA IPs. You must add any generated .sip file to your project for use by NativeLink simulation and the Intel^® Quartus^® Prime Archiver.
<variation name>.spd	Contains a list of required simulation files for your IP.

3.11. JESD204B IP Testbench

The JESD204B IP includes a testbench to demonstrate a normal link-up sequence for the JESD204B IP with a supported configuration. The testbench also provides an example of how to control the JESD204B IP interfaces.

The testbench instantiates the JESD204B IP in duplex mode and connects with the Intel^® FPGA Transceiver PHY Reset Controller IP. Some configurations are preset and are not programmable in the JESD204B IP testbench. For example, the JESD204B IP always instantiates in duplex mode even if RX or TX mode is selected in the JESD204B parameter editor.

Table 17. Preset Configurations for JESD204B IP Testbench
Configuration	Preset Value
JESD204B Wrapper	Base and PHY (MAC and PHY)
Data Path	Simplex TX and simplex RX
PLL/CDR Reference Clock Frequency²⁰	For Base only, or Simplex TX variants: Data_rate/20 (if you turn on Enabled Hard PCS) Data_rate/40 (if you turn on Enabled Soft PCS) Data_rate/80 (if you turn on Enabled PMA Direct)
Link Clock	Data_rate/40
AVS Clock	100 MHz

Figure 8. JESD204B IP Testbench Block DiagramThe external ATX PLL is present only in the JESD204B IP testbench targeting Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, the Transceiver PHY Reset Controller is within the transceiver block.

²⁰ For the ATX PLL supported range of reference clock frequencies, refer to the respective device datasheet.

3.11.1. Generating and Simulating the IP Testbench

You can simulate your JESD204B IP variation by using the provided IP demonstration testbench.

To use the JESD204B IP testbench, follow these steps:

Generate the simulation model. Refer to Generating the Testbench Simulation Model.
Simulate the testbench using the simulator-specific scripts that you have generated. Refer to Simulating the IP Testbench.

Note: Some configurations are preset and are not programmable in the JESD204B IP testbench. For more details, refer to JESD204B IP Testbench or the README.txt file located in the <example_design_directory>/ip_sim folder.

3.11.1.1. Generating the Testbench Simulation Model

To generate the testbench simulation model, execute the generated script (gen_sim_verilog.tcl or gen_sim_vhdl.tcl) located in the <example_design_directory>/ip_sim folder.

To run the Tcl script using the Intel^® Quartus^® Prime software, follow these steps:

Launch the Intel^® Quartus^® Prime software.
On the View menu, click Utility Windows > Tcl Console.
In the Tcl Console, type cd <example_design_directory>/ip_sim to go to the specified directory.
Type source gen_sim_verilog.tcl (Verilog) or source gen_sim_vhdl.tcl (VHDL) to generate the simulation files.

To run the Tcl script using the command line, follow these steps:

Obtain the Intel^® Quartus^® Prime software resource.
Type cd <example_design_directory>/ip_sim to go to the specified directory.
Type quartus_sh -t gen_sim_verilog.tcl (Verilog) or quartus_sh -t gen_sim_vhdl.tcl (VHDL) to generate the simulation files.

3.11.1.2. Simulating the IP Testbench

Note: VHDL is not supported in VCS simulator.

Table 18. Simulation Setup Scripts
Simulator	File Directory	Script
ModelSim* - Intel^® FPGA Edition/ ModelSim* - Intel^® FPGA Starter Edition	`<example_design_directory>`/ip_sim/testbench/setup_scripts/mentor	msim_setup.tcl
Synopsys VCS simulator	`<example_design_directory>`/ip_sim/testbench/setup_scripts/synopsys/vcs	vcs_setup.sh
Synopsys VCS-MX simulator	`<example_design_directory>`/ip_sim/testbench/setup_scripts/synopsys/vcsmx	vcsmx_setup.sh synopsys_sim.setup
Aldec Riviera-PRO* Note: Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices do not support this simulator.	`<example_design_directory>`/ip_sim/testbench/setup_scripts/aldec	rivierapro_setup.tcl
Cadence NCSim	`<example_design_directory>`/ip_sim/testbench/setup_scripts/cadence	ncsim_setup.sh
Cadence Xcelium* Parallel simulator	`<example_design_directory>`/ip_sim/testbench/setup_scripts/xcelium	xcelium_setup.sh

Table 19. Simulation Run Scripts
Simulator	File Directory	Script
ModelSim* - Intel^® FPGA Edition/ ModelSim* - Intel^® FPGA Starter Edition	`<example_design_directory>`/ip_sim/testbench/mentor	run_altera_jesd204_tb.tcl
Synopsys VCS simulator	`<example_design_directory>`/ip_sim/testbench/synopsys/vcs	run_altera_jesd204_tb.sh
Synopsys VCS-MX simulator	`<example_design_directory>`/ip_sim/testbench/synopsys/vcsmx	run_altera_jesd204_tb.sh
Aldec Riviera-PRO* Note: Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices do not support this simulator.	`<example_design_directory>`/ip_sim/testbench/aldec	run_altera_jesd204_tb.tcl
Cadence NCSim	`<example_design_directory>`/ip_sim/testbench/cadence	run_altera_jesd204_tb.sh
Cadence Xcelium* Parallel simulator	`<example_design_directory>`/ip_sim/testbench/xcelium	run_altera_jesd204_tb.sh

To simulate the testbench design using the ModelSim* - Intel^® FPGA Edition/ ModelSim* - Intel^® FPGA Starter Edition, follow these steps:

Launch the ModelSim* - Intel^® FPGA Edition/ ModelSim* - Intel^® FPGA Starter Edition.
On the File menu, click Change Directory > Select <example_design_directory>/ip_sim/testbench/<simulator name>.
On the File menu, click Load > Macro file. Select run_altera_jesd204_tb.tcl. This file compiles the design and runs the simulation automatically, providing a pass/fail indication on completion.

To simulate the testbench design using the Aldec Riviera-PRO^® simulator, follow these steps:

Launch the Aldec Riviera-PRO* simulator.
On the File menu, click Change Directory > Select <example_design_directory>/ip_sim/testbench/<simulator name>.
On the Tool menu, click Execute Macro. Select run_altera_jesd204_tb.tcl. This file compiles the design and runs the simulation automatically, providing a pass/fail indication on completion.

To simulate the testbench design using the VCS, VCS MX (in Linux), or Cadence simulators, follow these steps:

Launch the Synopsys VCS or VCS-MX, or Cadence NCSim or Xcelium* Parallel simulator.
On the File menu, click Change Directory > Select <example_design_directory>/ip_sim/testbench/<simulator name>.
Run the run_altera_jesd204_tb.sh file. This file compiles the design and runs the simulation automatically, providing a pass/fail indication on completion.

3.11.2. Testbench Simulation Flow

The JESD204B testbench simulation flow:

At the start, the system is under reset (all the components are in reset).
After 100 ns, the Transceiver Reset Controller IP core power up and wait for the tx_ready and rx_ready signal from the Transceiver Reset Controller IP to assert.
After 500 ns (all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile) or 1500 ns ( Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices), the reset signal of the JESD204B TX Avalon-MM interface is released (go HIGH). At the next positive edge of the link_clk signal, the JESD204B TX link powers up by releasing its reset signal.
The JESD204B TX link starts transmitting K28.5 characters.
The reset signal of the JESD204B RX Avalon-MM interface is released (go HIGH). At the next positive edge of the link_clk signal, the JESD204B RX link powers up by releasing its reset signal.
Once the link is out of reset, a SYSREF pulse is generated to reset the LMFC counter inside both the JESD204B TX and RX IP core.
When the txlink_ready signal is asserted, the packet generator starts sending packets to the TX datapath.
The packet checker starts comparing the packet sent from the TX datapath and received at the RX datapath after the rxlink_valid signal is asserted.
The testbench reports a pass or fail when all the packets are received and compared.

The testbench concludes by checking that all the packets have been received.

If no error is detected, the testbench issues a TESTBENCH PASSED message stating that the simulation was successful. If an error is detected, the testbench issues a TESTBENCH FAILED message to indicate that the testbench has failed.

Note: For Intel^® Stratix^® 10 L-tile and H-tile devices, reset deassertion staggering of TX/RX analog and digital reset happens before the assertion of TX/RX ready. The reset staggering may incur long simulation time. You may observe the staggering of TX and RX reset through tx_analogreset_stat, tx_digitalreset_stat, rx_analogreset_stat, and rx_digitalreset_stat respectively.

4. JESD204B IP Functional Description

The JESD204B IP implements a transmitter (TX) and receiver (RX) block. Each block has two layers and consists of the following components:

Media access control (MAC)—DLL block that consists of the link layer (link state machine and character replacement), CSR, Subclass 1 and 2 deterministic latency, scrambler or descrambler, and multiframe counter.
Physical layer (PHY)—PCS and PMA block that consists of the 8B/10B encoder, word aligner, serializer, and deserializer.

You can specify the datapath and wrapper for your design and generate them separately.

The TX and RX blocks in the DLL utilizes the Avalon-ST interface to transmit or receive data and the Avalon-MM interface to access the CSRs. The TX and RX blocks operate on 32-bit data width per channel, where the frame assembly packs the data into four octets per channel. Multiple TX and RX blocks can share the clock and reset if the link rates are the same.

Figure 9. Overview of the JESD204B IP Block DiagramIf your design uses hard PCS, the 8B/10B and word aligner blocks should be hard logic, but if your design uses soft PCS, the 8B/10B and word aligner blocks are soft logic.

Figure 10. JESD204B IP TX and RX Datapath Block Diagram

The JESD204B IP uses the Avalon-ST source and sink interfaces, with unidirectional flow of data, to transmit and receive data on the FPGA fabric interface.

32-Bit Architecture

The JESD204B IP consist of 32-bit internal datapath per lane. This means that JESD204B IP expects the data samples to be assembled into 32-bit data (4 octets) per lane in the transport layer before sending the data to the Avalon-ST data bus. The JESD204B IP operates in the link clock domain. The link clock runs at (data rate/40) because it is operating in 32-bit data bus after 8B/10B encoding.

As the internal datapath of the core is 32 bits, the (F × K) value must be in the order of 4 to align the multiframe length on a 32-bit boundary. Apart from this, the deterministic latency counter values such as LMFC counter, RX Buffer Delay (RBD) counter, and Subclass 2 adjustment counter is the link clock count instead of frame clock count.

Avalon-ST Interface

The JESD204B IP and transport layer in the design example use the Avalon-ST source and sink interfaces. There is no backpressure mechanism implemented in this core. The JESD204B IP expects continuous stream of data samples from the upstream device.

Avalon-MM Interface

The Avalon-MM slave interface provides access to internal CSRs. The read and write data width is 32 bits (DWORD access). The Avalon-MM slave is asynchronous to the txlink_clk, txframe_clk, rxlink_clk, and rxframe_clk clock domains. You are recommended to release the reset for the CSR configuration space first. All run-time JESD204B configurations like L, F, M, N, N', CS, CF, and HD should be set before releasing the reset for link and frame clock domain.

Each write transfer has a writeWaitTime of 0 cycle while a read transfer has a readWaitTime of 1 cycle and readLatency of 1 cycle.

4.1. Transmitter

The transmitter block, which interfaces to DAC devices, takes one of more digital sample streams and converts them into one or more serial streams.

The transmitter performs the following functions:

Data scrambling
Frame or lane alignment
Character generation
Serial lane monitoring
8B/10B encoding
Data serializer

Figure 11. Transmitter Data Path Block Diagram

The transmitter block consists of the following modules:

TX CSR—manages the configuration and status registers.
TX_CTL—manages the SYNC_N signal, state machine that controls the data link layer states, LMFC, and also the deterministic latency throughout the link.
TX Scrambler and Data Link Layer—takes in 32 bits of data that implements the Initial Lane Alignment Sequence (ILAS), performs scrambling, lane insertion and frame alignment of characters.

4.1.1. TX Data Link Layer

The JESD204B IP core TX data link layer includes three phases to establish a synchronized link—Code Group Synchronization (CGS), Initial Lane Synchronization (ILAS), and User Data phase.

4.1.1.1. TX CGS

The CGS phase is achieved through the following process:

Upon reset, the converter device (RX) issues a synchronization request by driving SYNC_N low. The JESD204B TX IP core transmits a stream of /K/ = /K28.5/ symbols. The receiver synchronizes when it receives four consecutive /K/ symbols.
For Subclass 0, the RX converter devices deassert SYNC_N signal at the frame boundary. After all receivers have deactivated their synchronization requests, the JESD204B TX IP core continues to emit /K/ symbols until the start of the next frame. The core proceeds to transmit ILAS data sequence or encoded user data if csr_lane_sync_en signal is disabled.
For Subclass 1 and 2, the RX converter devices deassert SYNC_N signal at the LMFC boundary. After all receivers deactivate the SYNC_N signal, the JESD204B TX IP core continues to transmit /K/ symbols until the next LMFC boundary. At the next LMFC boundary, the JESD204B IP core transmits ILAS data sequence. (There is no programmability to use a later LMFC boundary.)

4.1.1.2. TX ILAS

When lane alignment sequence is enabled through the csr_lane_sync_en register, the ILAS sequence is transmitted after the CGS phase. The ILAS phase takes up four multiframes. For Subclass 0 mode, you can program the CSR (csr_ilas_multiframe) to extend the ILAS phase to a maximum of 256 multiframes before transitioning to the encoded user data phase. The ILAS data is not scrambled regardless of whether scrambling is enabled or disabled.

The multiframe has the following structure:

Each multiframe starts with a /R/ character (K28.0) and ends with a /A/ character (K28.3)
The second multiframe transmits the ILAS configuration data. The multiframe starts with /R/ character (K28.0), followed by /Q/ character (K28.4), and then followed by the link configuration data, which consists of 14 octets as illustrated in the table below. It is then padded with dummy data and ends with /A/ character (K28.3), marking the end of multiframe.
Dummy octets are an 8-bit counter and is always reset when it is not in ILAS phase.
For a configuration of more than four multiframes, the multiframe follows the same rule above and is padded with dummy data in between /R/ character and /A/ character.

Table 20. Link Configuration Data Transmitted in ILAS Phase
Configuration Octet	Bits								Description
Configuration Octet	MSB	6	5	4	3	2	1	LSB	Description
0	DID[7:0]								DID = Device ID
1	ADJCNT[3:0]				BID[3:0]				ADJCNT = Number of adjustment resolution steps ²¹ BID = Bank ID
2	0	ADJDIR	PHADJ	LID[4:0]					ADJDIR = Direction to adjust DAC LMFC ²¹ PHADJ = Phase adjustment request ²¹ LID = Lane ID
3	SCR	0	0	L[4:0]					SCR = Scrambling enabled/disabled L = Number of lanes per device (link)
4	F[7:0]								F = Number of octets per frame per lane
5	0	0	0	K[4:0]					K = Number of frames per multiframe
6	M[7:0]								M = Number of converters per device
7	CS[1:0]		0	N[4:0]					CS = Number of control bits per sample N = Converter resolution
8	SUBCLASSV[2:0]			N_PRIME[4:0]					SUBCLASSV = Subclass version N_PRIME = Total bits per sample
9	JESDV[2:0]			S[4:0]					JESDV = JESD204 version S = Number of samples per converter per frame
10	HD	0	0	CF[4:0]					HD = High Density data format CF = Number of control words per frame clock per link
11	RES1[7:0]								RES1 = Reserved. Set to 8'h00
12	RES2[7:0]								RES2 = Reserved. Set to 8'h00
13	FCHK[7:0]								FCHK is the modulus 256 of the sum of the 13 configuration octets above. For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, Arria V, Cyclone V, and Stratix V devices, if you change any of the octets during run time, make sure to update the new FCHK value in the register.

The JESD204B TX IP core also supports debug feature to continuously stay in ILAS phase without exiting. You can enable this feature by setting the bit in csr_ilas_loop register. There are two modes of entry:

RX asserts SYNC_N and deasserts it after CGS phase. This activity triggers the ILAS phase and the CSR stays in ILAS phase indefinitely until this setting changes.
Link reinitialization through CSR is initiated. The JESD204B IP core transmits /K/ character and causes the RX converter to enter CGS phase. After RX deasserts SYNC_N, the CSR enters ILAS phase and stays in that phase indefinitely until this setting changes.

In ILAS loop, the multiframe transmission is the same where /R/ character (K28.0) marks the start of multiframe and /A/ character (K28.3) marks the end of multiframe, with dummy data in between. The dummy data is an increment of Dx.y.

²¹ Applies to Subclass 2 only.

4.1.1.3. User Data Phase

During the user data phase, character replacement at the end of frame and end of multiframe is opportunistically inserted so that there is no additional overhead for data bandwidth.

Character replacement for non-scrambled data

The character replacement for non-scrambled mode in the IP core follows these JESD204B specification rules:

At end of frame (not coinciding with end of multiframe), which equals the last octet in the previous frame, the transmitter replaces the octet with /F/ character (K28.7). However, the original octet is encoded if an alignment character was transmitted in the previous frame.
At the end of a multiframe, which equals to the last octet in the previous frame, the transmitter replaces the octet with /A/ character (K28.3), even if a control character was already transmitted in the previous frame.

For devices that do not support lane synchronization, only /F/ character replacement is done. At every end of frame, regardless of whether the end of multiframe equals to the last octet in previous frame, the transmitter encodes the octet as /F/ character (K28.7) if it fits the rules above.

Character replacement for scrambled data

The character replacement for scrambled data in the IP core follows these JESD204B specification rules:

At end of frame (not coinciding with end of multiframe), which equals to 0xFC (D28.7), the transmitter encodes the octet as /F/ character (K28.7).
At end of multiframe, which equals to 0x7C, the transmitter replaces the current last octet as /A/ character (K28.3).

For devices that do not support lane synchronization, only /F/ character replacement is done. At every end of frame, regardless of whether the end of multiframe equals to 0xFC (D28.7), the transmitter encodes the octet as /F/ character (K28.7) if it fits the rules above.

4.1.2. TX PHY Layer

The 8B/10B encoder encodes the data before transmitting them through the serial line. The 8B/10B encoding has sufficient bit transition density (3-8 transitions per 10-bit symbol) to allow clock recovery by the receiver. The control characters in this scheme allow the receiver to:

synchronize to 10-bit boundary.
insert special character to mark the start and end of frames and start and end of multiframes.
detect single bit errors.

The JESD204B IP core supports transmission order from MSB first as well as LSB first. For MSB first transmission, the serialization of the left-most bit of 8B/10B code group (bit "a") is transmitted first.

4.2. Receiver

The receiver block, which interfaces to ADC devices, receives the serial streams from one or more TX blocks and converts the streams into one or more sample streams.

The receiver performs the following functions:

Data deserializer
8B/10B decoding
Lane alignment
Character replacement
Data descrambling

Figure 12. Receiver Data Path Block Diagram

The receiver block includes the following modules:

RX CSR—manages the configuration and status registers.
RX_CTL—manages the SYNC_N signal, state machine that controls the data link layer states, LMFC, and also the buffer release, which is crucial for deterministic latency throughout the link.
RX Scrambler and Data Link Layer—takes in 32 bits of data that decodes the ILAS, performs descrambling, character replacement as per the JESD204B specification, and error detection (code group error, frame and lane realignment error).

4.2.1. RX Data Link Layer

The JESD204B IP core RX data link layer buffers incoming user data on all lanes until the RX elastic buffers can be released. Special character substitution are done in the TX link so that the RX link can execute frame and lane alignment monitoring based on the JESD204B specification.

4.2.1.1. RX CGS

The CGS phase is the link up phase that monitors the detection of /K28.5/ character.

The CGS phase is achieved through the following process:

Once the word boundary is aligned, the RX PHY layer detects the /K28.5/ 20-bit boundary and indicate that the character is valid.
The receiver deasserts SYNC_N on the next frame boundary (for Subclass 0) or on the next LMFC boundary (for Subclass 1 and 2) after the reception of four successive /K/ characters.
After correct reception of another four 8B/10B characters, the receiver assumes full code group synchronization. Error detected in this state machine is the code group error. Code group error always trigger link reinitialization through the assertion of SYNC_N signal and this cannot be disabled through the CSR. The CS state machine is defined as CS_INIT, CS_CHECK, and CS_DATA.
The minimum duration for a synchronization request on the SYNC_N is five frames plus nine octets.

4.2.1.2. Frame Synchronization

After CGS phase, the receiver assumes that the first non-/K28.5/ character marks the start of frame and multiframe. If the transmitter emits an initial lane alignment sequence, the first non-/K28.5/ character is /K28.0/. Similar to the JESD204B TX IP core, the csr_lane_sync_en is set to 1 by default, thus the RX core detects the /K/ character to /R/ character transition. If the csr_lane_sync_en is set to 0, the RX core detects the /K/ character to the first data transition. An ILAS error and unexpected /K/ character is flagged if either one of these conditions are violated.

When csr_lane_sync_en is set to 0, you have to disable data checking for the first 16 octets of data as the character replacement block takes 16 octets to recover the end-of-frame pointer for character replacement. When csr_lane_sync_en is set to 1 (default JESD204B setting), the number of octets to be discarded depends on the scrambler or descrambler block.

The receiver assumes that a new frame starts in every F octets. The octet counter is used for frame alignment and lane alignment.

4.2.1.3. Frame Alignment

The frame alignment is monitored through the alignment character /F/. The transmitter inserts this character at the end of frame. The /A/ character indicates the end of multiframe. The character replacement algorithm depends on whether scrambling is enabled or disabled, regardless of the csr_lane_sync_en register setting.

The alignment detection process:

If two successive valid alignment characters are detected in the same position other than the assumed end of frame—without receiving a valid or invalid alignment character at the expected position between two alignment characters—the receiver realigns its frame to the new position of the received alignment characters.
If lane realignment can result in frame alignment error, the receiver issues an error.

In the JESD204B RX IP core, the same flexible buffer is used for frame and lane alignment. Lane realignment gives a correct frame alignment because lane alignment character doubles as a frame alignment character. A frame realignment can cause an incorrect lane alignment or link latency. The course of action is for the RX to request for reinitialization through SYNC_N. ²²

²² Dynamic frame realignment and correction is not supported.

4.2.1.4. Lane Alignment

After the frame synchronization phase has entered FS_DATA, the lane alignment is monitored via /A/ character (/K28.3/) at the end of multiframe. The first /A/ detection in the ILAS phase is important for the RX core to determine the minimum RX buffer release for inter-lane alignment. There are two types of error that is detected in lane alignment phase:

Arrival of /A/ character from multiple lanes exceed one multiframe.
Misalignment detected during user data phase.

The realignment rules for lane alignment are similar to frame alignment:

If two successive and valid /A/ characters are detected at the same position other than the assumed end of multiframe—without receiving a valid/invalid /A/ character at the expected position between two /A/ characters—the receiver aligns the lane to the position of the newly received /A/ characters.
If a recent frame alignment causes the loss of lane alignment, the receiver realigns the lane frame—which is already at the position of the first received /A/ character—at the unexpected position.

4.2.1.5. ILAS Data

The JESD204B RX IP core captures 14 octets of link configuration data that are transmitted on the 2^nd multiframe of the ILAS phase. The receiver waits for the reception of /Q/ character that marks the start of link configuration data and then latch it into ILAS octets, which are per lane basis. You can read the 14 octets captured in the link configuration data through the CSR. You need to first set the csr_ilas_data_sel register to select which link configuration data lane it is trying to read from. Then, proceed to read from the csr_ilas_octet register.

4.2.1.6. Initial Lane Synchronization

The receivers in Subclass 1 and Subclass 2 modes store data in a memory buffer (Subclass 0 mode does not store data in the buffer but immediately releases them on the frame boundary as soon as the latest lane arrives.). The RX IP core detects the start of multiframe of user data per lane and then wait for the latest lane data to arrive. The latest data is reported as RBD count (csr_rbd_count) value which you can read from the status register. This is the earliest release opportunity of the data from the deskew FIFO (referred to as RBD offset).

The JESD204B RX IP core supports RBD release at 0 offset and also provides programmable offset through RBD count. By default, the RBD release can be programmed through the csr_rbd_offset to release at the LMFC boundary. If you want to implement an early release mechanism, program it in the csr_rbd_offset register. The csr_rbd_offset and csr_rbd_count is a counter based on the link clock boundary (not frame clock boundary). Therefore, the RBD release opportunity is at every four octets.

Figure 13. Subclass 1 Deterministic Latency and Support for Programmable Release Opportunity

4.2.2. RX PHY Layer

The word aligner block identifies the MSB and LSB boundaries of the 10-bit character from the serial bit stream. Manual alignment is set because the /K/ character must be detected in either LSB first or MSB first mode. When the programmed word alignment pattern is detected in the current word boundary, the PCS indicates a valid pattern in the rx_sync_status (mapped as pcs_valid to the IP core). The code synchronization state is detected after the detection of the /K/ character boundary for all lanes.

In a normal operation, whenever synchronization is lost, the JESD204B RX IP core always return back to the CS_INIT state where the word alignment is initiated. For debug purposes, you can bypass this alignment by setting the csr_patternalign_en register to 0.

The 8B/10B decoder decode the data after receiving the data through the serial line. The JESD204B IP core supports transmission order from MSB first as well as LSB first.

The PHY layer can detect 8B/10B not-in-table (NIT) error and also running disparity error.

4.3. Operation

4.3.1. Operating Modes

The JESD204B IP core supports Subclass 0, 1, and 2 operating modes.

4.3.1.1. Subclass 0 Operating Mode

The JESD204B IP core maintains a LMFC counter that counts from 0 to (F × K/4)–1 and wraps around again. The LMFC counter starts counting at the deassertion of SYNC_N signal from multiple DACs after synchronization. This is to align the LMFC counter upon transmission and can only be done after all the converter devices have deasserted its synchronization request signal.

4.3.1.2. Subclass 1 Operating Mode

The JESD204B IP core maintains a LMFC counter that counts from 0 to (F × K/4)–1 and wraps around again. The LMFC counter resets within two link clock cycles after converter devices issue a common SYSREF frequency to all the transmitters and receivers. The SYSREF frequency must be the same for converter devices that are grouped and synchronized together.

Table 21. Example of SYSREF Frequency CalculationIn this example, you can choose to perform one of the following options:

provide two *SYSREF* and device clock, where the ADC groups share both the device clock and *SYSREF* (18.75 MHz and 9.375 MHz)

provide one *SYSREF* (running at 9.375 MHz) and device clock for all the ADC and DAC groups because the *SYSREF* period in the DAC is a multiplication of n integer.
Group	Configuration	SYSREF Frequency
ADC Group 1 (2 ADCs)	LMF = 222 K = 16 Data rate = 6 Gbps	(6 GHz / 40) / (2 x 16 / 4) = 18.75 MHz
ADC Group 2 (2 ADCs)	LMF = 811 K = 32 Data rate = 6 Gbps	(6 GHz / 40) / (1 x 32 / 4) = 18.75 MHz
DAC Group 3 (2 DACs)	LMF = 222 K = 16 Data rate = 3 Gbps	(3 GHz / 40) / (2 x 16 / 4) = 9.375 MHz

4.3.1.3. Subclass 2 Operating Mode

The JESD204B IP core maintains a LMFC counter that counts from 0 to (F × K/4)–1 and wraps around again. The LMFC count starts upon reset and the logic device always acts as the timing master. To support Subclass 2 for multi-link device, you must deassert the resets for all JESD204B IP core links synchronously at the same clock edge. This deassertion ensures that the internal LMFC vaunter is aligner across multi-link. The converters adjust their own internal LMFC to match the master's counter. The alignment of LMFC within the system relies on the correct alignment of SYNC_N signal deassertion at the LMFC boundary.

The alignment of LMFC to RX logic is handled within the TX converter. The RX logic releases SYNC_N at the LMFC tick and the TX converter adjust its internal LMFC to match the RX LMFC.

For the alignment of LMFC to the TX logic, the JESD204B TX IP core samples SYNC_N from the DAC receiver and reports the relative phase difference between the DAC and TX logic device LMFC in the TX CSR (dbg_phadj, dbg_adjdir, and dbg_adjcnt). Based on the reported value, you can calculate the adjustment required. Then, to initiate the link reinitialization through the CSR, set the value in the TX CSR (csr_phadj, csr_adjdir, and csr_adjcnt). The values on the phase adjustment are embedded in bytes 1 and 2 of the ILAS sequence that is sent to the DAC during link initialization. On the reception of the ILAS, the DAC adjusts its LMFC phase by step count value and sends back an error report with the new LMFC phase information. This process may be repeated until the LMFC at the DAC and the logic device are aligned.

Table 22. `dbg_phadj`, `dbg_adjdir` and `dbg_adjcnt` Values for Different `SYNC_N` Deassertions
Case	`SYNC_N` Signal Deassertion	`dbg_phadj` Value	`dbg_adjdir` Value	`dbg_adjcnt` Value
1	Happens at LMFC boundary²³	0	—	—
2	Happens at LMFC count value that is equals or less than half of FxK/4 value	1	0	Number of link clock cycles from the LMFC boundary to the detection of `SYNC_N` signal deassertion
3	Happens at LMFC count value that is more than half of FxK/4 value	1	1	Number of link clock cycles from detection of the `SYNC_N` signal deassertion to the next LMFC boundary

Figure 14. Timing Diagram Example for Case 1

Figure 15. Timing Diagram Example for Case 2

Figure 16. Timing Diagram Example for Case 3

²³ No adjustment is required.

4.3.2. Scrambler/Descrambler

Both the scrambler and descrambler are designed in a 32-bit parallel implementation and the scrambling/descrambling order starts from first octet with MSB first.

The JESD204B TX and RX IP core support scrambling by implementing a 32-bit parallel scrambler in each lane. The scrambler and descrambler are located in the JESD204B IP MAC interfacing to the Avalon-ST interface. You can enable or disable scrambling and this option applies to all lanes. Mixed mode operation, where scrambling is enabled for some lanes, is not permitted.

The scrambling polynomial:

1 + x¹⁴ + x¹⁵

The descrambler can self-synchronize in eight octets. In a typical application where the reset value of the scrambler seed is different from the converter device to FPGA logic device, the correct user data is recovered in the receiver in two link clocks (due to the 32-bit architecture). The PRBS pattern checker on the transport layer should always disable checking of the first eight octets from the JESD204B RX IP core.

4.3.3. SYNC_N Signal

For Subclass 0 implementation, the SYNC_N signal from the DAC converters in the same group path must be combined.

In some applications, multiple converters are grouped together in the same group path to sample a signal (referred as multipoint link). The FPGA can only start the LMFC counter and its transition to ILAS after all the links deassert the synchronization request. The JESD204B TX IP core provides three signals to facilitate this application. The SYNC_N is the direct signal from the DAC converters. The error signaling from SYNC_N is filtered and sent out as dev_sync_n signal. For Subclass 0, you need to multiplex all the dev_sync_n signals in the same multipoint link and then input them to the IP core through mdev_sync_n signal.

Figure 17. Subclass 0 — Combining the SYNC_N Signal for JESD204B TX IP Core

For Subclass 1 implementation, you may choose to combine or not to combine the SYNC_N signal from the converter device. If you implement two ADC converter devices as a multipoint link and one of the converter is unable to link up, the functional link still operates. You must manage the trace length for the SYSREF signal and also the differential pair to minimize skew.

The SYNC_N is the direct signal from the DAC converters. The error signaling from SYNC_N is filtered and sent out as dev_sync_n output signal. The dev_sync_n signal from the JESD204B TX IP core must loopback into the mdev_sync_n signal of the same instance without combining the SYNC_N signal.

You must set the same RBD offset value (csr_rbd_offset) to all the JESD204B RX IP cores within the same multipoint link for the RBD release (the latest lane arrival for each of the links). The JESD204B RX IP core deskews and outputs the data when the RBD offset value is met. The total latency is consistent in the system and is also the same across multiple resets. Setting a different RBD offset to each link or setting an early release does not guarantee deterministic latency and data alignment.

Figure 18. Subclass 1 — Combining the SYNC_N Signal for JESD204B TX IP Core

4.3.4. Link Reinitialization

The JESD204B TX and RX IP core support link reinitialization.

There are two modes of entry for link reinitialization:

Hardware initiated link reinitialization:
- For TX, the reception of SYNC_N for more than five frames and nine octets triggers link reinitialization.
- For RX, the loss of code group synchronization, frame alignment and lane alignment errors cause the IP core to assert SYNC_N and request for link reinitialization.
Software initiated link reinitialization—both the TX and RX IP core allow software to request for link reinitialization.
- For TX, the IP core transmits /K/ character and wait for the receiver to assert SYNC_N to indicate that it has entered CS_INIT state.
- For RX, the IP core asserts SYNC_N to request for link reinitialization.

Hardware initiated link reinitialization can be globally disabled through the csr_link_reinit_disable register for debug purposes.

Hardware initiated link reinitialization can be issued as interrupt depending on the error type and interrupt error enable. If lane misalignment has been detected as a result of a phase change in local timing reference, the software can rely on this interrupt trigger to initiates a LMFC realignment. The realignment process occurs by first resampling SYSREF and then issuing a link reinitialization request.

4.3.5. Link Startup Sequence

Set the run-time LMF configuration when the txlink_rst_n or rxlink_rst_n signals are asserted. Upon txlink_rst_n or rxlink_rst_n deassertion, the JESD204B IP core begins operation. The following sections describe the detailed operation for each subclass mode.

TX (Subclass 0)

Upon reset deassertion, the JESD204B TX IP core is in CGS phase. SYNC_N deassertion from the converter device enables the JESD204B TX IP core to exit CGS phase and enter ILAS phase (if csr_lane_sync_en = 1) or User Data phase (if csr_lane_sync_en = 0).

TX (Subclass 1)

Upon reset deassertion, the JESD204B TX IP core is in CGS phase. SYNC_N deassertion from the converter device enables the JESD204B TX IP core to exit CGS phase. The IP core ensures that at least one SYSREF rising edge is sampled before exiting CGS phase and entering ILAS phase. This is to prevent a race condition where the SYNC_N is deasserted before SYSREF is sampled. SYSREF sampling is crucial to ensure deterministic latency in the JESD204B Subclass 1 system.

TX (Subclass 2)

Similar to Subclass 1 mode, the JESD204B TX IP core is in CGS phase upon reset deassertion. The LMFC alignment between the converter and IP core starts after SYNC_N deassertion. The JESD204B TX IP core detects the deassertion of SYNC_N and compares the timing to its own LMFC. The required adjustment in the link clock domain is updated in the register map. You need to update the final phase adjustment value in the registers for it to transfer the value to the converter during the ILAS phase. The DAC adjusts the LMFC phase and acknowledge the phase change with an error report. This error report contains the new DAC LMFC phase information, which allows the loop to iterate until the phase between them is aligned.

RX (Subclass 0)

The JESD204B RX IP core drives and holds SYNC_N (dev_sync_n signal) low when it is in reset. Upon reset deassertion, the JESD204B RX IP core checks if there is sufficient /K/ character to move its state machine out of synchronization request. Once sufficient /K/ character is detected, the IP core deasserts SYNC_N.

RX (Subclass 1)

The JESD204B RX IP core drives and holds the SYNC_N (dev_sync_n signal) low when it is in reset. Upon reset deassertion, the JESD204B RX IP core checks if there is sufficient /K/ character to move its state machine out of synchronization request. The IP core also ensures that at least one SYSREF rising edge is sampled before deasserting SYNC_N. This is to prevent a race condition where the SYNC_N is deasserted based on internal free-running LMFC count instead of the updated LMFC count after SYSREF is sampled.

RX (Subclass 2)

The JESD204B RX IP core behaves the same as in Subclass 1 mode. In this mode, the logic device is always the master timing reference. Upon SYNC_N deassertion, the ADC adjusts the LMFC timing to match the IP core.

4.3.6. Error Reporting Through SYNC_N Signal

The JESD204B TX IP core can detect error reporting through SYNC_N when SYNC_N is asserted for two frame clock periods (if F >= 2) or four frame clock periods (if F = 1). When the downstream device reports an error through SYNC_N, the TX IP core issues an interrupt. The TX IP core samples the SYNC_N pulse width using the link clock.

For a special case of F = 1, two frame clock periods are less than one link clock. Therefore, the error signaling from the receiver may be lost. You must program the converter device to extend the SYNC_N pulse to four frame clocks when F = 1.

The JESD204B RX IP core does not report an error through SYNC_N signaling. Instead, the RX IP core issues an interrupt when any error is detected.

You can check the csr_tx_err, csr_rx_err0, and csr_rx_err1 register status to determine the error types.

4.4. Clocking Scheme

This section describes the clocking scheme for the JESD204B IP core and transceiver.

Table 23. JESD204B IP Core Clocks
Clock Signal	Formula	Description
TX/RX Device Clock: `pll_ref_clk`	PLL selection during IP core generation	The PLL reference clock used by the TX Transceiver PLL or RX CDR. This is also the recommended reference clock to the PLL Intel^® FPGA IP core (for Arria V, Cyclone V, or Stratix V devices) or IOPLL Intel^® FPGA IP core (for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices).
TX/RX Link Clock: `txlink_clk` `rxlink_clk`	Data rate/40	The timing reference for the JESD204B IP core.The link clock runs at data rate/40 because the IP core operates in a 32-bit data bus architecture after 8B/10B encoding. For Subclass 1, to avoid half link clock latency variation, you must supply the device clock at the same frequency as the link clock. The JESD204B transport layer in the design example requires both the link clock and frame clock to be synchronous.
TX/RX Frame Clock (in design example): `txframe_clk` `rxframe_clk`	Data rate/(10 × F)	The frame clock as per the JESD204B specification. This clock is applicable to the JESD204B transport layer and other upstream devices that run in frame clock such as the PRBS generator/checker or any data processing blocks that run at the same rate as the frame clock. The JESD204B transport layer in the design example also supports running the frame clock in half rate or quarter rate by using the FRAMECLK_DIV parameter. The JESD204B transport layer requires both the link clock and frame clock to be synchronous. For more information, refer to the F1/F2_FRAMECLK_DIV parameter description and its relationship to the frame clock in the respective JESD204B Intel^® FPGA IP design example user guides.
TX/RX Transceiver Serial Clock and Parallel Clock	Internally derived from the data rate during IP core generation	The serial clock is the bit clock to stream out serialized data. The transceiver PLL supplies this clock and is internal to the transceiver. The parallel clock is for the transmitter PMA and PCS within the PHY. This clock is internal to the transceiver and is not exposed in the JESD204B IP core. For Arria V, Cyclone V, and Stratix V devices, these clocks are internally generated as the transceiver PLL is encapsulated within the JESD204B IP core's PHY. For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices, you need to generate the transceiver PLL based on the data rate and connect the serial and parallel clock. You are recommended to select medium bandwidth for the transceiver PLL setting. These clocks are referred to as `serial_clk` and `bonding_clock` in Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices. Refer to the respective Transceiver PHY IP Core User Guides for more information.
TX/RX PHY Clock: `txphy_clk` `rxphy_clk`	Data rate/40 (for all devices except Arria V GT/ST in PMA Direct mode) Data rate/80 (for Arria V GT/ST devices in PMA Direct mode)	The PHY clock generated from the transceiver parallel clock for the TX path or the recovered clock generated from the CDR for the RX path. There is limited use for this clock. Avoid using this clock when PMA Direct mode is selected. Use this clock only if the JESD204B configuration is F=4 and the core is operating at Subclass 0 mode. This clock can be used as input for both the `txlink_clk` and `txframe_clk`, or `rxlink_clk` and `rxframe_clk`. When you set the PCS option to enable Hard PCS or Soft PCS mode, the `txphy_clk` connects to the transceiver `tx_std_clkout` signal and the `rxphy_clk` connects to the `rx_std_clkout` signal. These are the clock lines at the PCS and FPGA fabric interface. When you enable PMA Direct mode (for Arria V GT/ST only), the `txphy_clk` connects to the transceiver `tx_pma_clkout` signal and the `rxphy_clk` connects to the `rx_pma_clkout` signal. These are the clock lines at the PMA and PCS interface.
TX/RX AVS Clock: `jesd204_tx_avs_clk` `jesd204_rx_avs_clk`	75–125 MHz	The configuration clock for the JESD204B IP core CSR through the Avalon-MM interface.
Transceiver Management Clock: `reconfig_clk`	100 MHz–125 MHz ( Intel^® Arria^® 10) 100 MHz–125 MHz ( Intel^® Cyclone^® 10 GX) 100 MHz–150 MHz ( Intel^® Stratix^® 10)	The configuration clock for the transceiver CSR through the Avalon-MM interface. This clock is exported only when the transceiver dynamic reconfiguration option is enabled. This clock is only applicable for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.

4.4.1. Device Clock

In a converter device, the sampling clock is typically the device clock.

For the JESD204B IP in an FPGA logic device, you need one or two reference clocks as shown in Figure 19 and Figure 20. In the single reference clock design, the device clock is used as the transceiver PLL reference clock and also the core PLL reference clock. In the dual reference clock design, the device clock is used as the core PLL reference clock and the other reference clock is used as the transceiver PLL reference clock. The available frequency depends on the PLL type, bonding option, number of lanes, and device family. During IP core generation, the Intel^® Quartus^® Prime software recommends the available reference frequency for the transceiver PLL and core PLL based on user selection.

Note: Due to the clock network architecture in the FPGA, Intel recommends that you use the device clock to generate the link clock and use the link clock as the timing reference. You need to use the PLL Intel^® FPGA IP core (in Arria V, Cyclone V, and Stratix V devices) or IOPLL Intel^® FPGA IP core (in Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices) to generate the link clock and frame clock. The link clock is used in the JESD204B IP (MAC) and the transport layer. You are recommended to supply the reference clock source through a dedicated reference clock pin.

Based on the JESD204B specification for Subclass 1, the device clock is the timing reference and is source synchronous with SYSREF. To achieve deterministic latency, match the board trace length of the SYSREF signal with the device clock. Maintain a constant phase relationship between the device clock and SYSREF signal pairs going to the FPGA and converter devices. Ideally, the SYSREF pulses from the clock generator should arrive at the FPGA and converter devices at the same time. To avoid half link clock latency variation, you must supply the device clock at the same frequency as the link clock.

The JESD204B protocol does not support rate matching. Therefore, you must ensure that the TX or RX device clock (pll_ref_clk) and the PLL reference clock that generates link clock (txlink_clk or rxlink_clk) and frame clock (txframe_clk or rxframe_clk) have 0 ppm variation. Both PLL reference clocks should come from the same clock chip.

Figure 19. JESD204B Subsystem with Shared Transceiver Reference Clock and Core Clock

Note: This diagram is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.

Figure 20. JESD204B Subsystem with Separate Transceiver Reference Clock and Core Clock

4.4.2. Link Clock

The device clock is the timing reference for the JESD204B system.

Due to the clock network architecture in the FPGA, JESD204B IP core does not use the device clock to clock the SYSREF signal because the GCLK or RCLK is not fully compensated. You are recommended to use the PLL Intel^® FPGA IP core (in Arria V, Cyclone V, and Stratix V devices) or IOPLL Intel^® FPGA IP core (in Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices) to generate both the link clock and frame clock. The PLL Intel^® FPGA IP core must operate in normal mode or source synchronous mode and uses a dedicated reference clock pin as the input reference clock source to achieve the following state:

the GCLK and RCLK clock network latency is fully compensated.
the link clock and frame clock at the registers are phase-aligned to the input of the clock pin.

To provide consistency across the design regardless of frame clock and sampling clock, the link clock is used as a timing reference.

The PLL Intel^® FPGA IP core should provide both the frame clock and link clock from the same PLL as these two clocks are treated as synchronous in the design.

For Subclass 0 mode, the device clock is not required to sample the SYSREF signal edge. The link clock does not need to be phase compensated to capture SYSREF. Therefore, you can generate both the link clock and frame clock using direct mode in the PLL Intel^® FPGA IP core. If F = 4, where link clock is the same as the frame clock, you can use the parallel clock output from the transceiver (txphy_clk or rxphy_clk signal) except when the PCS option is in PMA Direct mode.

4.4.3. Local MultiFrame Clock

The Local MultiFrame Clock (LMFC) is a counter generated from the link clock and depends on the F and K parameter.

The K parameter must be set between 1 to 32 and meet the requirement of at least a minimum of 17 octets and a maximum of 1024 octets in a single multiframe. In a 32-bit architecture, the K × F must also be in the order of four.

In a Subclass 1 deterministic latency system, the SYSREF frequency is distributed to the devices to align them in the system. The SYSREF resets the internal LMFC clock edge when the sampled SYSREF signal's rising edge transition from 0 to 1. Due to source synchronous signaling of SYSREF with respect to the device clock sampling (provided from the clock chip), the JESD204B IP core does not directly use the device clock to sample SYSREF but instead uses the link clock to sample SYSREF. Therefore, the Intel^® FPGA PLL IP core that provides the link clock must to be in normal mode to phase-compensate the link clock to the device clock.

Based on hardware testing, to get a fixed latency, at least 32 octets are recommended in an LMFC period so that there is a margin to tune the RBD release opportunity to compensate any lane-to-lane deskew across multiple resets. If F = 1, then K = 32 is optimal as it provides enough margin for system latency variation. If F = 2, then K = 16 and above (18/20/22/24/26/28/30/32) is sufficient to compensate lane-to-lane deskew.

The JESD204B IP core implements the local multiframe clock as a counter that increments in link clock counts. The local multiframe clock counter is equal to (F × K/4) in link clock as units. The rising edge of SYSREF resets the local multiframe clock counter to 0. There are two CSR bits that controls SYSREF sampling.

csr_sysref_singledet—resets the local multiframe clock counter once and automatically cleared after SYSREF is sampled. This register also prevents CGS exit to bypass SYSREF sampling.
csr_sysref_alwayson—resets the local multiframe clock counter at every rising edge of SYSREF that it detects. This register also enables the SYSREF period checker. If the provided SYSREF period violates the F and K parameter, an interrupt is triggered. However, this register does not prevent CGS-SYSREF race condition.

The following conditions occur if both CSR bits are set:

resets the local multiframe clock counter at every rising edge of SYSREF.
prevents CGS-SYSREF race condition.
checks SYSREF period.

4.4.4. Clock Correlation

This section describes the clock correlation between the device clock, link clock, frame clock, and local multiframe clock.

Example 1

Targeted Device with LMF=222, K=16 and Data rate = 6.5 Gbps

Device Clock Selected = 325 MHz (obtained during IP core generation)

Link Clock = 6.5 GHz/40 = 162.5 MHz

Frame Clock = 6.5 GHz/(10x2) = 325 MHz

Local Multiframe Clock = 325 MHz / 16 = 20.3125 MHz

SYSREF Frequency = Local Multiframe Clock / n; (n = integer; 1, 2, …)

Local Multiframe Clock Counter = (F × K/4) = (2×16/4) = 8 link clocks ²⁴

Example 2

Targeted Device with LMF=244, K=16 and Data rate = 5.0 Gbps

Device Clock Selected = 125 MHz (obtained during IP core generation)

Link Clock = 5 GHz/40 = 125 MHz ²⁵

Frame Clock = 5 GHz /(10×4) = 125 MHz ²⁵

Local Multiframe Clock = 125 MHz / 16 = 7.8125 MHz

SYSREF Frequency = Local Multiframe Clock / n; (n = integer; 1, 2, …)

Local Multiframe Clock Counter = (F × K/4) = (4×16/4) = 16 link clocks ²⁴

Example 3

Targeted Device with LMF=421, K=32 and Data rate = 10.0 Gbps

Device Clock Selected = 250 MHz (obtained during IP core generation)

Link Clock = 10 GHz/40 = 250 MHz

Frame Clock = 10 GHz/(10×1) = 1 GHz ²⁶

Local Multiframe Clock = 1 GHz / 32 = 31.25 MHz

SYSREF Frequency = Local Multiframe Clock / n; (n = integer; 1, 2, …)

Local Multiframe Clock Counter = (F × K/4) = (1×32/4) = 8 link clocks ²⁴

Example 4 (When F=3, for Intel^® Stratix^® 10 devices only)

Targeted Device with LMF=883, K=32 and Data rate = 12.0 Gbps

Device Clock Selected = 300 MHz (obtained during IP core generation)

Link Clock = 12 GHz/40 = 300 MHz

Frame Clock = 12 GHz/(10×3) = 400 MHz ²⁷

Local Multiframe Clock = 400 MHz / 32 = 12.5 MHz

SYSREF Frequency = Local Multiframe Clock / n; (n = integer; 1, 2, …)

Local Multiframe Clock Counter = (F × K/4) = (3×32/4) = 24 link clocks ²⁴

²⁴ Eight link clocks mean that the local multiframe clock counts from values 0 to 7 and then loops back to 0.

²⁵ The link clock and frame clock are running at the same frequency. You only need to generate one clock from the Intel^® FPGA PLL or Intel^® FPGA IO PLL IP core.

²⁶ In this example, the frame clock may not be able to run up to 1 GHz in the FPGA fabric. The JESD204B transport layer in the design example supports running the data stream of half rate (1 GHz/2 = 500 MHz), at two times the data bus width or of quarter rate (1GHz/4 = 250 MHz), at four times the data bus width.

²⁷ The JESD204B transport layer in the design example runs the data stream at half rate (400 MHz/2 = 200 MHz), two times the data bus width.

4.5. Reset Scheme

All resets in the JESD204B IP are synchronous reset signals and should be asserted and deasserted synchronously.

Note: Ensure that the resets are synchronized to the respective clocks for reset assertion and deassertion.

Table 24. JESD204B IP Resets
Reset Signal	Associated Clock	Description
`txlink_rst_n` `rxlink_rst_n`	TX/RX Link Clock	Active low reset. Intel^® recommends that you: Assert the `txlink_rst_n`/`rxlink_rst_n` and `txframe_rst_n` /`rxframe_rst_n` signals when the transceiver is in reset. Deassert the `txlink_rst_n` and `txframe_rst_n` signals after the Intel^® FPGA PLL IP is locked and the `tx_ready[]` signal from the Transceiver Reset Controller is asserted. Deassert the `rxlink_rst_n` and `rxframe_rst_n` signals after the Transceiver CDR `rx_islockedtodata[]` signal and `rx_ready[]` signal from the Transceiver Reset Controller are asserted. The `txlink_rst_n`/`rxlink_rst_n` and `txframe_rst_n` /`rxframe_rst_n` signals can be deasserted at the same time. These resets can only be deasserted after you configure the CSR registers.
`txframe_rst_n` `rxframe_rst_n`	TX/RX Frame Clock	Active low reset controlled by the clock and reset unit. If the TX/RX link clock and the TX/RX frame clock has the same frequency, both can share the same reset.
`tx_analogreset[L-1:0]` `rx_analogreset[L-1:0]`	Transceiver Native PHY Analog Reset	Active high reset controlled by the transceiver reset controller. This signal resets the TX/RX PMA. The link clock, frame clock, and AVS clock reset signals (`txlink_rst_n`/`rxlink_rst_n`, `txframe_rst_n`/`rxframe_rst_n` and `jesd204_tx_avs_rst_n`/`jesd204_rx_avs_rst_n`) can only be deasserted after the transceiver comes out of reset. ²⁸ Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_analogreset_stat[L-1:0]` `rx_analogreset_stat[L-1:0]`	Transceiver Native PHY Analog Reset	TX PMA analog reset status port connected to the transceiver reset controller. ²⁹ Note: This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`tx_digitalreset[L-1:0]` `rx_digitalreset[L-1:0]`	Transceiver Native PHY Digital Reset	Active high reset controlled by the transceiver reset controller. This signal resets the TX/RX PCS. The link clock, frame clock, and AVS clock reset signals (`txlink_rst_n`/`rxlink_rst_n`, `txframe_rst_n`/`rxframe_rst_n` and `jesd204_tx_avs_rst_n`/`jesd204_rx_avs_rst_n`) can only be deasserted after the transceiver comes out of reset. ²⁸ Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_digitalreset_stat[L-1:0]` `rx_digitalreset_stat[L-1:0]`	Transceiver Native PHY Digital Reset	TX PCS digital reset status port connected to the transceiver reset controller.²⁹ Note: This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`jesd204_tx_avs_rst_n` `jesd204_rx_avs_rst_n`	TX/RX AVS (CSR) Clock	Active low reset controlled by the clock and reset unit. Typically, both signals can be deasserted after the core PLL and transceiver PLL are locked and out of reset. If you want to dynamically modify the LMF at run-time, you can program the CSRs after AVS reset is deasserted. This phase is referred to as the configuration phase. After the configuration phase is complete, then only the `txlink_rst_n`/`rxlink_rst_n` and `txframe_rst_n`/`rxframe_rst_n` signals can be deasserted.

²⁸ Refer to the respective Transceiver PHY IP User Guides for the timing diagram of the tx_analogreset, rx_analogreset, tx_digitalreset, and rx_digitalreset signals.

²⁹ Refer to the Intel^® Stratix^® 10 L- and H-tile Transceiver PHY IP User Guide for the timing diagram of the tx_analogreset_stat, rx_analogreset_stat, tx_digitalreset_stat, and rx_digitalreset_stat signals.

4.5.1. Reset Sequence

Intel^® recommends that you assert reset for the JESD204B IP core and transport layer when powering up the PLLs and transceiver.

4.5.2. ADC–FPGA Subsystem Reset Sequence

Figure 21. ADC–FPGA Subsystem Reset Sequence Timing Diagram

The recommended ADC – FPGA subsystem bring-up sequence:

Provide a free-running and stable reference clock to the converter and FPGA in the JESD204B subsystem. The reference clock for the converter is the device clock. Intel^® recommends four reference clocks for the FPGA.
1. The first reference clock is the calibration clock for the transceiver.
  - For Intel^® Stratix^® 10 devices, this is the clock at the OSC_CLK_1 pin for the calibration engine.
  - For Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices, this is the clock at the CLKUSR pin for the calibration engine.
  - For Arria V, Cyclone V, and Stratix V devices, this is the clock for the transceiver reconfiguration controller.
2. The second reference clock is the management clock for the transceiver reconfiguration interface and the JESD204B IP core Avalon-MM interface.
  - If the dynamic reconfiguration option is enabled for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices, this reference clock is connected to the reconfig_clk input port of the JESD204B IP core.
3. The third reference clock is the transceiver reference clock.
  - For Intel^® Stratix^® 10, you must provide the reference clock at the transceiver dedicated reference clock input pin.
  - For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, Arria V, Cyclone V, and Stratix V devices, this clock is also used as the reference clock for the core PLL (IOPLL Intel^® FPGA IP core for Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices; and PLL Intel^® FPGA IP core for Arria V, Cyclone V, and Stratix V devices) if you share the device clock and the transceiver reference clock (refer to Figure 19).
4. The fourth reference clock is the core PLL reference clock (device clock).
  - For Intel^® Stratix^® 10, you must provide the reference clock at the dedicated reference clock input pin at the IO bank.
  - For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, Arria V, Cyclone V, and Stratix V devices, this is the reference clock for the core PLL (IOPLL Intel^® FPGA IP core for Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices; and PLL Intel^® FPGA IP core for Arria V, Cyclone V, and Stratix V devices) if you do not share the device clock and the transceiver reference clock (refer to Figure 19).
Configure the FPGA. Hold the RX transceiver channel in reset.
- For Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices, if the reference clock is not available for the transceiver CDR before the FPGA is configured, you need to hold the RX transceiver channels in reset and perform user calibration for the RX transceiver channels after the reference clock is stable. For more information about user calibration for the transceiver channels, refer to the Calibration chapter in the Intel^® Arria^® 10 or Intel^® Cyclone^® 10 GX Transceiver PHY User Guides.
You can program the ADC through its SPI interface before or after configuring the FPGA. Ensure that the ADC PLL is locked before you proceed to the next step.
Ensure that the FPGA device clock core PLL is locked to the reference clock.
Deassert the FPGA RX transceiver channel reset. Do this by deasserting the reset input pin of the Transceiver PHY Reset Controller.
Once the transceiver is out of reset (the rx_ready signal from the Intel^® FPGA Transceiver PHY Reset Controller is asserted), deassert the Avalon-MM interface reset for the IP core. At the configuration phase, the subsystem can program the JESD204B IP core if the default IP core register settings need to change.
Deassert both the link reset for the IP core and the frame reset for the transport layer.
For subclass 1, if the continuous SYSREF pulses from the clock generator are present when the RX link reset is deasserted, the ADC-RX link initializes. If the SYSREF pulse is not present, trigger the clock generator to provide a SYSREF pulse to initialize the link. For subclass 0, the link initializes after the ADC is programmed and the RX link reset is deasserted.

4.5.3. FPGA–DAC Subsystem Reset Sequence

Figure 22. FPGA–DAC Subsystem Reset Sequence Timing Diagram

The recommended FPGA – DAC subsystem bring-up sequence:

Provide a free-running and stable reference clock to the converter and FPGA in the JESD204B subsystem. The reference clock for the converter is the device clock. Intel^® recommends four reference clocks for the FPGA.
1. The first reference clock is the calibration clock for the transceiver.
  - For Intel^® Stratix^® 10 devices, this is the clock at the OSC_CLK_1 pin for the calibration engine.
  - For Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices, this is the clock at the CLKUSR pin for the calibration engine.
  - For Stratix V, Arria V, and Cyclone V devices, this is the clock for the transceiver reconfiguration controller.
2. The second reference clock is the management clock for the transceiver reconfiguration interface and the JESD204B IP core Avalon MM interface.
  - If the dynamic reconfiguration option is enabled for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices, this reference clock is connected to the reconfig_clk input port of the JESD204B IP core.
3. The third reference clock is the transceiver reference clock.
  - For Intel^® Stratix^® 10, you must provide the reference clock at the transceiver dedicated reference clock input pin.
  - For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, Arria^® V, Cyclone^® V, and Stratix^® V, this clock is also used as the reference clock for the core PLL (IOPLL Intel^® FPGA IP core for Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX; and PLL Intel^® FPGA IP core for Arria V, Cyclone V, and Stratix V devices) if you share the device clock and the transceiver reference clock (refer to Figure 19).
4. The fourth reference clock is the core PLL reference clock (device clock).
  - For Intel^® Stratix^® 10, you must provide the reference clock at the dedicated reference clock input pin at the IO bank.
  - For Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, Arria^® V, Cyclone^® V, and Stratix^® V, this is the reference clock for the core PLL (IOPLL Intel^® FPGA IP core for Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices; and PLL Intel^® FPGA IP core for Arria V, Cyclone V, and Stratix V devices) if you do not share the device clock and the transceiver reference clock (refer to Figure 20).
Configure the FPGA. Hold the TX transceiver PLL and channel in reset.
- For Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX devices, if the reference clock is not available for the transceiver PLL before the FPGA is configured, you need to hold the transceiver PLL and channels in reset and perform user calibration for the transceiver PLL and TX channels after the reference clock is stable. For more information about user calibration for the transceiver PLL and channels, refer to the Calibration chapter in the Intel^® Arria^® 10 or Intel^® Cyclone^® 10 GX Transceiver PHY User Guides.
Ensure that the FPGA device clock core PLL is locked to the reference clock.
Deassert the FPGA TX transceiver PLL and channel reset. Do this by deasserting the reset input pin of the Transceiver PHY Reset Controller.
Ensure that the FPGA transceiver PLL is locked to the reference clock.
Once the TX transceiver PLL and channel are out of reset (the tx_ready signal from the Transceiver PHY Reset Controller is asserted), deassert the Avalon-MM interface reset for the IP core. At the configuration phase, the subsystem can program the JESD204B IP core if the default IP core register settings need to change.
Deassert both the link reset for the IP core and the frame reset for the transport layer.
The TX IP core streams /K/ characters to the DAC after TX link reset is deasserted.
Program the DAC through its SPI interface.
For subclass 1, if the continuous SYSREF pulses from the clock generator are present when the TX link reset is deasserted, the TX-DAC link initializes. If the SYSREF pulse is not present, trigger the clock generator to provide a SYSREF pulse to initialize the link.
For subclass 0, the link initializes after the DAC is programmed and the TX link reset is deasserted.

4.6. Signals

The JESD204B IP core signals are listed by interface:

Transmitter
Receiver

Note: You should terminate any unused signals.

4.6.1. Transmitter Signals

Figure 23. Transmitter Signal DiagramL denotes the number of lanes.

Table 25. Transmitter Signals
Signal	Width	Direction	Description
Clocks and Resets
`pll_ref_clk`	1	Input	Transceiver reference clock signal. The reference clock selection depends on the FPGA device family and data rate. This signal is only applicable for Arria V, Cyclone V, and Stratix V devices.
`txlink_clk`	1	Input	TX link clock signal. This clock is equal to the TX data rate divided by 40. For Subclass 1, you cannot use the output of `txphy_clk` signal as `txlink_clk` signal . To sample `SYSREF` correctly, the core PLL must provide the `txlink_clk` signal and must be configured as normal operating mode.
`txlink_rst_n_reset_n`	1	Input	Reset for the TX link clock signal. This reset is an active low signal.
`txphy_clk[]`	L	Output	TX parallel clock output for the TX transceiver with PCS option in Hard PCS or Soft PCS mode. This clock has the same frequency as `txlink_clk` signal. For PCS option in PMA Direct mode, this clock is half the frequency of `txlink_clk` signal. This clock is output as an optional port for user if the `txlink_clk` and `txframe_clk` signals are operating at the same frequency in Subclass 0 operating mode.
`tx_digitalreset[]` ³⁰	L	Input	Reset for the transceiver PCS block. This reset is an active high signal. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_digitalreset_stat[]`	L	Output	TX PCS digital reset status port connected to the transceiver reset controller. This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`tx_analogreset[]` ³⁰	L	Input	Reset for the transceiver PMA block. This reset is an active high signal. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_analogreset_stat[]`	L	Output	TX PMA analog reset status port connected to the transceiver reset controller. Note: This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`pll_locked[]` ³⁰	L	Output	This is the PLL locked output signal for the hard transceiver of the Arria V, Cyclone V, and Stratix V devices. This signal is asserted to indicate that the TX transceiver PLL is locked.
`pll_locked[]` ³⁰	L	Input	This is the input signal for the Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_cal_busy[]` ³⁰	L	Output	TX calibration in progress signal. This signal is asserted to indicate that the TX transceiver calibration is in progress. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`pll_powerdown[]` ³⁰	1 if bonding mode = "xN" L if bonding mode = feedback_compensation	Input	TX transceiver PLL power down signal. This signal is only applicable for Arria V, Cyclone V, and Stratix V devices.
`tx_bonding_clocks` (Single Channel) `tx_bonding_clocks_ch<0..L-1>[]` (Multiple Channels)	6	Input	The transceiver PLL bonding clocks. The transceiver PLL generation provides these clocks. This signal is only available if you select `Bonded` mode for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`tx_serial_clk0` (Single Channel) `tx_serial_clk0_ch<0..L-1>` (Multiple Channels)	1	Input	The transceiver PLL serial clock. This is the serializer clock in the PMA. The transceiver PLL generation provides these clocks. This signal is only available if you select `Non-bonded` mode for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 L-tile and H-tile devices. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
Signal	Width	Direction	Description
Transceiver Interface
`tx_serial_data[]`	L	Output	Differential high-speed serial output data. The clock is embedded in the serial data stream.
`tx_serial_data_n`	L	Output	Differential high-speed serial output data. The clock is embedded in the serial data stream. You don't need to connect this signal at the top-level pinout for proper compilation. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`reconfig_to_xcvr[]`	(L+1)70 if bonding mode = "xN" L140 if bonding mode = feedback compensation	Input	Reconfiguration signals from the Transceiver Reconfiguration Controller IP core to the PHY device. This signal is only applicable for Arria V, Cyclone V, and Stratix V devices. You must connect these signals to the Transceiver Reconfiguration Controller IP core regardless of whether run-time reconfiguration is enabled or disabled. The Transceiver Reconfiguration Controller IP core also supports various calibration function during transceiver power up.
`reconfig_from_xcvr[]`	(L+1)46 if bonding mode = "xN" L92 if bonding mode = feedback compensation	Output	Reconfiguration signals to the Transceiver Reconfiguration Controller IP core. This signal is only applicable for Arria V, Cyclone V, and Stratix V devices. You must connect these signals to the Transceiver Reconfiguration Controller IP core regardless of whether run-time reconfiguration is enabled or disabled. The Transceiver Reconfiguration Controller IP core also supports various calibration function during transceiver power up.
`reconfig_clk` `reconfig_clk[]` `reconfig_clk_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The Avalon-MM clock input. The frequency range is 100–125 MHz. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_reset` `reconfig_reset[]` `reconfig_reset_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Reset signal for the Transceiver Reconfiguration Controller IP core. This signal is active high and level sensitive. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_address[]` `reconfig_avmm_address_ch<0..L-1>[]`	Intel^® Arria^® 10 log₂L1024 if Share Reconfiguration Interface = On 10L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 10 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On Intel^® Stratix^® 10 log₂L2048 if Share Reconfiguration Interface = On 11L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 11 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The Avalon-MM address. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_writedata[]` `reconfig_avmm_writedata_ch<0..L-1>[]`	For all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile. 32 if Share Reconfiguration Interface = On 32L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 32 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On For Intel^® Stratix^® 10 E-tile devices. 8 if Share Reconfiguration Interface = On 8L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 8 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The input data. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_readdata[]` `reconfig_avmm_readdata_ch<0..L-1>[]`	For all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile. 32 if Share Reconfiguration Interface = On 32L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 32 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices. 8 if Share Reconfiguration Interface = On 8L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 8 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Output	The output data. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_write` `reconfig_avmm_write[]` `reconfig_avmm_write_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Write signal. This signal is active high. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_read` `reconfig_avmm_read[]` `reconfig_avmm_read_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Read signal. This signal is active high. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_waitrequest` `reconfig_avmm_waitrequest[]` `reconfig_avmm_waitrequest_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Output	Wait request signal. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`phy_tx_ready`	L	Output	Signal to indicate the transceiver TX is ready. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`phy_tx_pma_ready`	L	Output	Signal to indicate the transceiver TX PMA is ready. This signal must be asserted before you assert or deassert any TX resets. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`phy_tx_rst_n`	1	Input	Active-high hard reset signal that resets the transceiver TX interface. Asserting this signal does not reset the transceiver PMA. Refer to the E-tile Transceiver PHY User Guide about how to reset PMA through the Avalon-MM reconfiguration interface. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
Signal	Width	Direction	Description
Avalon-ST Interface
`jesd204_tx_link_data[]`	L*32	Input	Indicates a 32-bit user data at `txlink_clk` clock rate, where four octets are packed into a 32-bit data width per lane. The data format is big endian. The first octet is located at bit[31:24], followed by bit[23:16], bit[15:8], and the last octet is bit[7:0]. Lane 0 data is always located in the lower 32-bit data. If more than one lane is instantiated, lane 1 is located at bit[63:32], with the first octet position at bit[63:56].
`jesd204_tx_link_valid`	1	Input	Indicates whether the data from the transport layer is valid or invalid. The Avalon-ST sink interface in the TX core cannot be backpressured and assumes that data is always valid on every cycle when the `jesd204_tx_link_ready` signal is asserted. 0—data is invalid 1—data is valid
`jesd204_tx_link_ready`	1	Output	Indicates that the Avalon-ST sink interface in the TX core is ready to accept data. The Avalon-ST sink interface asserts this signal on the JESD204B link state of USER_DATA phase. The ready latency is 0.
`jesd204_tx_frame_ready`	1	Output	Indicates that the Avalon-ST sink interface in the transport layer is ready to accept data. The Avalon-ST sink interface asserts this signal on the JESD204B link state of ILAS 4^th multiframe and also the USER_DATA phase. The ready latency is 0.
Signal	Width	Direction	Description
Avalon-MM Interface
`jesd204_tx_avs_clk`	1	Input	The Avalon-MM interface clock signal. This clock is asynchronous to all the functional clocks in the JESD204B IP core. The JESD204B IP core can handle any cross clock ratio and therefore the clock frequency can range from 75 MHz to 125 MHz.
`jesd204_tx_avs_rst_n`	1	Input	This reset is associated with the `jesd204_tx_avs_clk` signal. This reset is an active low signal. You can assert this reset signal asynchronously but must deassert it synchronously to the `jesd204_tx_avs_clk` signal. After you deassert this signal, the CPU can configure the CSRs.
`jesd204_tx_avs_chipselect`	1	Input	When this signal is present, the slave port ignores all Avalon-MM signals unless this signal is asserted. This signal must be used in combination with read or write. If the Avalon-MM bus does not support chip select, you are recommended to tie this port to 1.
`jesd204_tx_avs_address[]`	8	Input	For Avalon-MM slave, the interconnect translates the byte address into a word address in the address space so that each slave access is for a word of data. For example, address = 0 selects the first word of the slave and address = 1 selects the second word of the slave.
`jesd204_tx_avs_writedata[]`	32	Input	32-bit data for write transfers. The width of this signal and the `jesd204_tx_avs_readdata[31:0]` signal must be the same if both signals are present
`jesd204_tx_avs_read`	1	Input	This signal is asserted to indicate a read transfer. This is an active high signal and requires the `jesd204_tx_avs_readdata[31:0]` signal to be in use.
`jesd204_tx_avs_write`	1	Input	This signal is asserted to indicate a write transfer. This is an active high signal and requires the `jesd204_tx_avs_writedata[31:0]` signal to be in use.
`jesd204_tx_avs_readdata[]`	32	Output	32-bit data driven from the Avalon-MM slave to master in response to a read transfer.
`jesd204_tx_avs_waitrequest`	1	Output	This signal is asserted by the Avalon-MM slave to indicate that it is unable to respond to a read or write request. The JESD204B IP core ties this signal to 0 to return the data in the access cycle.
Signal	Width	Direction	Description
JESD204 Interface
`sysref`	1	Input	SYSREF signal for JESD204B Subclass 1 implementation. For Subclass 0 and Subclass 2 mode, tie-off this signal to 0.
`sync_n`	1	Input	Indicates `SYNC_N` from the converter device or receiver. This is an active low signal and is asserted 0 to indicate a synchronization request or error reporting from the converter device. To indicate a synchronization request, the converter device must assert this signal for at least five frames and nine octets. To indicate an error reporting, the converter device must ensure that the pulse is at least one cycle of the `txlink_clk` signal or two cycles of the `txframe_clk` signal (whichever period is longer).
`dev_sync_n`	1	Output	Indicates a clean synchronization request. This is an active low signal and is asserted 0 to indicate a synchronization request only. The `sync_n` signal error reporting is being masked out of this signal. This signal is also asserted during software-initiated synchronization.
`mdev_sync_n`	1	Input	Indicates a multidevice synchronization request. Synchronize signal combination should be done externally and then input to the JESD204B IP core through this signal. For subclass 0—combine the `dev_sync_n` signal from all multipoint links before connecting to the `mdev_sync_n` signal. For subclass 1—connect the `dev_sync_n` signal to the `mdev_sync_n` signal for each link respectively. In a single link instance where multidevice synchronization is not needed, tie the `dev_sync_n` signal to this signal.
`somf[]`	4	Output	Indicates a start of multiframe. [3]—start of multiframe for `jesd204_tx_link_data[31:24`] [2]—start of multiframe for `jesd204_tx_link_data[23:16]` [1]—start of multiframe for `jesd204_tx_link_data[15:8]` [0]—start of multiframe for `jesd204_tx_link_data[7:0]`
Signal	Width	Direction	Description
CSR
`jesd204_tx_frame_error`	1	Input	Optional signal to indicate an empty data stream due to invalid data. This signal is asserted high to indicate an error during data transfer from the transport layer to the TX core.
`csr_l[]`	5	Output	Indicates the number of active lanes for the link. The transport layer can use this signal as a run-time parameter.
`csr_f[]`	8	Output	Indicates the number of octets per frame. The transport layer can use this signal as a run-time parameter.
`csr_k[]`	5	Output	Indicates the number of frames per multiframe. The transport layer can use this signal as a run-time parameter.
`csr_m[]`	8	Output	Indicates the number of converters for the link. The transport layer can use this signal as a run-time parameter.
`csr_cs[]`	2	Output	Indicates the number of control bits per sample. The transport layer can use this signal as a run-time parameter.
`csr_n[]`	5	Output	Indicates the converter resolution. The transport layer can use this signal as a run-time parameter.
`csr_np[]`	5	Output	Indicates the total number of bits per sample. The transport layer can use this signal as a run-time parameter.
`csr_s[]`	5	Output	Indicates the number of samples per converter per frame cycle. The transport layer can use this signal as a run-time parameter.
`csr_hd`	1	Output	Indicates the high density data format. The transport layer can use this signal as a run-time parameter.
`csr_cf[]`	5	Output	Indicates the number of control words per frame clock period per link. The transport layer can use this signal as a run-time parameter.
`csr_lane_powerdown[]`	L	Output	Indicates which lane is powered down. You need to set this signal if you have configured the link and want to reduce the number of active lanes.
Signal	Width	Direction	Description
Out-of-band (OOB)
`jesd204_tx_int`	1	Output	Interrupt pin for the JESD204B IP core. Interrupt is asserted when any error or synchronization request is detected. Configure the `tx_err_enable` register to set the type of error that can trigger an interrupt.
Signal	Width	Direction	Description
Debug or Testing
`jesd204_tx_dlb_data[]`	L*32	Output	Optional signal for parallel data from the DLL in TX to RX loopback testing. ³¹
`jesd204_tx_dlb_kchar_data[]`	L*4	Output	Optional signal to indicate the K character value for each byte in TX to RX loopback testing. ³¹
`csr_tx_testmode[]`	4	Output	Indicates the test mode for the JESD204B IP core and the test pattern for the test pattern generator in the design example. Note: The test pattern generator is a component of the design example and is not a part of the JESD204B IP core. Refer to the `tx_test` register in the register map.
`csr_tx_testpattern_a[]`	32	Output	A 32-bit fixed data pattern for testing purpose, such as short transport layer test pattern. You can configure the fixed data pattern through the TX register `user_test_pattern_a (offset 0xD4)` ³²
`csr_tx_testpattern_b[]`	32	Output	A 32-bit fixed data pattern for testing purpose, such as short transport layer test pattern. You can configure the fixed data pattern through the TX register `user_test_pattern_b (offset 0xD8)` ³²
`csr_tx_testpattern_c[]`	32	Output	A 32-bit fixed data pattern for testing purpose, such as short transport layer test pattern. You can configure the fixed data pattern through the TX register `user_test_pattern_c (offset 0xDC)` ³²
`csr_tx_testpattern_d[]`	32	Output	A 32-bit fixed data pattern for testing purpose, such as short transport layer test pattern. You can configure the fixed data pattern through the TX register `user_test_pattern_d (offset 0xE0)` ³²

³⁰ The Transceiver PHY Reset Controller IP core controls this signal.

³¹ This signal is only for internal testing purposes. You can leave this signal disconnected.

³² You can connect this signal to the TX transport layer as test data samples or to the JESD204B TX IP core to emulate data from the TX transport layer. You may ignore this signal if unused. to the JESD204B TX IP core.

4.6.2. Receiver Signals

Figure 24. Receiver Signal DiagramL denotes the number of lanes.

Table 26. Receiver Signals
Signal	Width	Direction	Description
Clocks and Resets
`pll_ref_clk`	1	Input	Transceiver reference clock signal.
`rxlink_clk`	1	Input	RX link clock signal used by the Avalon-ST interface. This clock is equal to RX data rate divided by 40. For Subclass 1, you cannot use the output of `rxphy_clk` signal as `rxlink_clk` signal. To sample `SYSREF` correctly, the core PLL must provide the `rxlink_clk` signal and must be configured as normal operating mode.
`rxlink_rst_n_reset_n`	1	Input	Reset for the RX link clock signal. This reset is an active low signal.
`rxphy_clk[]`	L	Output	Recovered clock signal. This clock is derived from the clock data recovery (CDR) and the frequency depends on the JESD204B IP core data rate. For PCS option in Hard PCS or Soft PCS mode, this clock has the same frequency as the `rxlink_clk` signal. For PCS option in PMA Direct mode, this clock is half the frequency of `rxlink_clk` signal.
`rx_digitalreset[]` ³³	L	Input	Reset for the transceiver PCS block. This reset is an active high signal. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`rx_digitalreset_stat[]`	L	Output	TX PCS digital reset status port connected to the transceiver reset controller. Note: This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`rx_analogreset[]` ³³	L	Input	Reset for the CDR and transceiver PMA block. This reset is an active high signal. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`rx_analogreset_stat[]`	L	Output	TX PMA analog reset status port connected to the transceiver reset controller. Note: This signal is applicable only for Intel^® Stratix^® 10 L-tile and H-tile devices.
`rx_islockedtodata[]` ³³	L	Output	This signal is asserted to indicate that the RX CDR PLL is locked to the RX data and the RX CDR has changed from LTR to LTD mode.
`rx_cal_busy[]` ³³	L	Output	RX calibration in progress signal. This signal is asserted to indicate that the RX transceiver calibration is in progress. Note: This signal is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
Signal	Width	Direction	Description
Transceiver Interface
`rx_serial_data[]`	L	Input	Differential high-speed serial input data. The clock is recovered from the serial data stream.
`rx_serial_data_n`	L	Input	Differential high-speed serial input data. The clock is recovered from the serial data stream. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`reconfig_to_xcvr[]`	L*70	Input	Dynamic reconfiguration input for the hard transceiver. This signal is only applicable for for Arria V, Cyclone V, and Stratix V devices. You must connect these signals to the Transceiver Reconfiguration Controller IP core regardless of whether run-time reconfiguration is enabled or disabled. The Transceiver Reconfiguration Controller IP core also supports various calibration function during transceiver power up.
`reconfig_from_xcvr[]`	L*46	Output	Dynamic reconfiguration output for the hard transceiver. This signal is only applicable for for Arria V, Cyclone V, and Stratix V devices You must connect these signals to the Transceiver Reconfiguration Controller IP core regardless of whether run-time reconfiguration is enabled or disabled. The Transceiver Reconfiguration Controller IP core also supports various calibration function during transceiver power up.
`reconfig_clk` `reconfig_clk[]` `reconfig_clk_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The Avalon-MM clock input. The frequency range is 100–125 MHz. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_reset` `reconfig_reset[]` `reconfig_reset_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Reset signal for the Transceiver Reconfiguration Controller IP core. This signal is active high and level sensitive. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_address[]` `reconfig_avmm_address_ch<0..L-1>[]`	Intel^® Arria^® 10 and Intel^® Cyclone^® 10 GX log₂L1024 if Share Reconfiguration Interface = On 10L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 10 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On Intel^® Stratix^® 10 log₂L2048 if Share Reconfiguration Interface = On 11L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 11 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The Avalon-MM address. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_writedata[]` `reconfig_avmm_writedata_ch<0..L-1>[]`	For all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile. 32 if Share Reconfiguration Interface = On 32L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 32 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices. 8 if Share Reconfiguration Interface = On 8L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 8 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	The input data. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_readdata[]` `reconfig_avmm_readdata_ch<0..L-1>[]`	For all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile. 32 if Share Reconfiguration Interface = On 32L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 32 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices. 8 if Share Reconfiguration Interface = On 8L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 8 bits per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Output	The output data. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_write` `reconfig_avmm_write[]` `reconfig_avmm_write_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Write signal. This signal is active high. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_read` `reconfig_avmm_read[]` `reconfig_avmm_read_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Input	Read signal. This signal is active high. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`reconfig_avmm_waitrequest` `reconfig_avmm_waitrequest[]` `reconfig_avmm_waitrequest_ch<0..L-1>`	1 if Share Reconfiguration Interface = On L if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = Off 1 bit per channel port if Share Reconfiguration Interface = Off and Provide Separate Reconfiguration Interface for Each Channel = On	Output	Wait request signal. This signal is only available if you enable dynamic reconfiguration for Intel^® Arria^® 10, Intel^® Cyclone^® 10 GX, and Intel^® Stratix^® 10 devices.
`phy_rx_ready`	L	Output	Signal to indicate the transceiver RX is ready. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`phy_rx_pma_ready`	L	Output	Signal to indicate the transceiver RX PMA is ready. This signal must be asserted before you assert or deassert any RX resets. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
`phy_rx_rst_n`	1	Input	Active-high hard reset signal that resets the transceiver RX interface. Asserting this signal does not reset the transceiver PMA. Refer to the E-tile Transceiver PHY User Guide about how to reset PMA through the Avalon-MM reconfiguration interface. Note: This signal is applicable only for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.
Signal	Width	Direction	Description
Avalon-ST Interface
`jesd204_rx_link_data[]`	L*32	Output	Indicates a 32-bit data from the DLL to the transport layer. The data format is big endian, where the earliest octet is placed in bit [31:24] and the latest octet is placed in bit [7:0].
`jesd204_rx_link_valid`	1	Output	Indicates whether the data to the transport layer is valid or invalid. The Avalon-ST source interface in the RX core cannot be backpressured and transmits the data when the `jesd204_rx_data_valid` signal is asserted. 0—data is invalid 1—data is valid
`jesd204_rx_link_ready`	1	Input	Indicates that the Avalon-ST sink interface in the transport layer is ready to receive data.
`jesd204_rx_frame_error`	1	Input	Indicates an empty data stream due to invalid data. This signal is asserted high to indicate an error during data transfer from the RX core to the transport layer.
Signal	Width	Direction	Description
Avalon-MM Interface
`jesd204_rx_avs_clk`	1	Input	The Avalon-MM interface clock signal. This clock is asynchronous to all the functional clocks in the JESD204B IP core. The JESD204B IP core can handle any cross clock ratio and therefore the clock frequency can range from 75 MHz to 125 MHz.
`jesd204_rx_avs_rst_n`	1	Input	This reset is associated with the `jesd204_rx_avs_clk` signal. This reset is an active low signal. You can assert this reset signal asynchronously but must deassert it synchronously to the `jesd204_rx_avs_clk` signal. After you deassert this signal, the CPU can configure the CSRs.
`jesd204_rx_avs_chipselect`	1	Input	When this signal is present, the slave port ignores all Avalon-MM signals unless this signal is asserted. This signal must be used in combination with read or write. If the Avalon-MM bus does not support chip select, you are recommended to tie this port to 1.
`jesd204_rx_avs_address[]`	8	Input	For Avalon-MM slave, the interconnect translates the byte address into a word address in the address space so that each slave access is for a word of data. For example, address = 0 selects the first word of the slave and address = 1 selects the second word of the slave.
`jesd204_rx_avs_writedata[]`	32	Input	32-bit data for write transfers. The width of this signal and the `jesd204_rx_avs_readdata[31:0]` signal must be the same if both signals are present.
`jesd204_rx_avs_read`	1	Input	This signal is asserted to indicate a read transfer. This is an active high signal and requires the `jesd204_rx_avs_readdata[31:0]` signal to be in use.
`jesd204_rx_avs_write`	1	Input	This signal is asserted to indicate a write transfer. This is an active high signal and requires the `jesd204_rx_avs_writedata[31:0]` signal to be in use.
`jesd204_rx_avs_readdata[]`	32	Output	32-bit data driven from the Avalon-MM slave to master in response to a read transfer.
`jesd204_rx_avs_waitrequest`	1	Output	This signal is asserted by the Avalon-MM slave to indicate that it is unable to respond to a read or write request. The JESD204B IP core ties this signal to 0 to return the data in the access cycle.
Signal	Width	Direction	Description
JESD204 Interface
`sysref`	1	Input	`SYSREF` signal for JESD204B Subclass 1 implementation. For Subclass 0 and Subclass 2 mode, tie-off this signal to 0.
`dev_sync_n`	1	Output	Indicates a SYNC~ from the receiver. This is an active low signal and is asserted 0 to indicate a synchronization request. Instead of reporting the link error through this signal, the JESD204B IP core uses the `jesd204_rx_int` signal to interrupt the CPU. For multilink synchronization, you can optionally connect the `DEV_SYNC_N` from each IP core to the input of an AND gate. The output of the AND gate is exported to the FPGA pins for connection to the analog-to-digital converters. Refer to AN803 and AN804 for more information about the connection guidelines.
`sof[]`	4	Output	Indicates a start of frame. [3]—start of frame for `jesd204_rx_link_data[31:24`] [2]—start of frame for `jesd204_rx_link_data[23:16]` [1]—start of frame for `jesd204_rx_link_data[15:8]` [0]—start of frame for `jesd204_rx_link_data[7:0]`
`somf[]`	4	Output	Indicates a start of multiframe. [3]—start of multiframe for `jesd204_rx_link_data[31:24`] [2]—start of multiframe for `jesd204_rx_link_data[23:16]` [1]—start of multiframe for `jesd204_rx_link_data[15:8]` [0]—start of multiframe for `jesd204_rx_link_data[7:0]`
`dev_lane_aligned`	1	Output	Indicates that all lanes for this device are aligned.
`alldev_lane_aligned`	1	Input	Aligns all lanes for this device. For multidevice synchronization, input all the `dev_lane_aligned` signals to an AND gate and connect the AND gate output to this pin. For single device support, connect the `dev_lane_aligned` signal back to this signal.
Signal	Width	Direction	Description
CSR
`csr_l[]`	5	Output	Indicates the number of active lanes for the link. The transport layer can use this signal as a run-time parameter.
`csr_f[]`	8	Output	Indicates the number of octets per frame. The transport layer can use this signal as a run-time parameter.
`csr_k[]`	5	Output	Indicates the number of frames per multiframe. The transport layer can use this signal as a run-time parameter.
`csr_m[]`	8	Output	Indicates the number of converters for the link. The transport layer can use this signal as a run-time parameter.
`csr_cs[]`	2	Output	Indicates the number of control bits per sample. The transport layer can use this signal as a run-time parameter.
`csr_n[]`	5	Output	Indicates the converter resolution. The transport layer can use this signal as a run-time parameter.
`csr_np[]`	5	Output	Indicates the total number of bits per sample. The transport layer can use this signal as a run-time parameter.
`csr_s[]`	5	Output	Indicates the number of samples per converter per frame cycle. The transport layer can use this signal as a run-time parameter.
`csr_hd`	1	Output	Indicates the high density data format. The transport layer can use this signal as a run-time parameter.
`csr_cf[]`	5	Output	Indicates the number of control words per frame clock period per link. The transport layer can use this signal as a run-time parameter.
`csr_lane_powerdown[]`	L	Output	Indicates which lane is powered down. You need to set this signal if you have configured the link and want to reduce the number of active lanes.
Signal	Width	Direction	Description
Out-of-band (OOB)
`jesd204_rx_int`	1	Output	Interrupt pin for the JESD204B IP core. Interrupt is asserted when any error is detected. Configure the `rx_err_enable` register to set the type of error that can trigger an interrupt.
Signal	Width	Direction	Description
Debug or Testing
`jesd204_rx_dlb_data[]`	L*32	Input	Optional signal for parallel data to the DLL in TX to RX loopback testing. ³⁴
`csr_rx_testmode[]`	4	Output	Indicates the test mode for the JESD204B IP core and the test pattern for the test pattern checker in the design example. Note: The test pattern checker is a component of the design example and is not a part of the JESD204B IP core. Refer to the `rx_test` register in the register map.
`jesd204_rx_dlb_data_valid[]`	L	Input	Optional signal to indicate valid data for each byte in TX to RX loopback testing. ³⁴
`jesd204_rx_dlb_kchar_data[]`	L*4	Input	Optional signal to indicate the K character value for each byte in TX to RX loopback testing. ³⁴
`jesd204_rx_dlb_errdetect[]`	L*4	Input	Optional signal to indicate 8B/10B error. ³⁴
`jesd204_rx_dlb_ disperr[]`	L*4	Input	Optional signal to indicate running disparity. ³⁴

³³ The Transceiver PHY Reset Controller IP Core controls this signal.

³⁴ This signal is only for internal testing purposes. Tie this signal to low.

4.7. Registers

The JESD204B IP core supports a basic one clock cycle transaction bus. There is no support for burst mode and wait-state feature (the avs_waitrequest signal is tied to 0). The JESD204B IP core Avalon-MM slave interface has a data width of 32 bits and is implemented based on word addressing. The Avalon-MM slave interface does not support byte enable access.

Each write transfer has a writeWaitTime of 0 cycle while a read transfer has a readWaitTime of 1 cycle and readLatency of 1 cycle.

The following sections list the TX and RX core registers. The register address in the register map is written based on byte addressing. The Platform Designer interconnect automatically converts from byte to word addressing. You do not need to manually shift the address bus. If the Avalon-MM master interfaces to the IP core Avalon-MM slave without the Platform Designer interconnect, to perform byte to word addressing conversion, you are recommended to shift the Avalon-MM master address bus by 2 bits (divide by 4) when connecting to the IP core's Avalon-MM slave. In this connection, the Avalon-MM master address bit[2] connects to the IP core (Avalon-MM slave) address bit[0], while the Avalon-MM master bit[9] connects to the IP core address bit[7].

Note: For Intel^® Stratix^® 10 devices, run-time access for certain registers have been disabled. Refer to the TX and RX register map for more information.

4.7.1. Register Access Type Convention

This table describes the register access type for Intel^® FPGA IP cores.

Table 27. Register Access Type and Definition
Access Type	Definition
RO	Software read only (no effect on write). The value is hard-tied internally to either '0' or '1' and does not vary.
RO/v	Software read only (no effect on write). The value may vary.
RC	Software reads and returns the current bit value, then the bit is self-clear to 0. Software reads also cause the bit value to be cleared to 0.
RW	Software reads and returns the current bit value. Software writes and sets the bit to the desired value.
RW1C	Software reads and returns the current bit value. Software writes 0 and have no effect. Software writes 1 and clear the bit to 0, if the bit has been set to 1 by hardware. Hardware sets the bit to 1. Software clear has higher priority than hardware set.
RW1S	Software reads and returns the current bit value. Software writes 0 and have no effect. Software writes 1 and set the bit to 1. Hardware clears the bit to 0, if the bit has been set to 1 by software. Software set has higher priority than hardware clear.

4.7.2. Transmitter Registers

Table 28. lane_ctrl_commonCommon lane control and assignment. The common lane control applies to all lanes in the link..
Offset: 0x0

Note: The bits that are compile-time specific are not configurable through register. You must recompile to change the value.)
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl	Physical lane control reserve register	RW	0x0
1	csr_bit reversal	Bit reversal for LSB/MSB first serialization. This is a compile-time option which needs to be set before IP generation. 0 = LSB-first serialization 1 = MSB-first serialization Note: JESD204B converter device may support either MSB-first serialization or LSB-first serialization. You must set both `csr_byte_reversal` and `csr_bit_reversal` bits to 1 when generating the IP. When `csr_bit_reversal` = 1, the word aligner reverses the TX parallel data bits before transmitting it to the PMA for serialization. For example; in 20-bit mode; D[19:0] is rewired to D[0:19] and in 40-bit mode; D[39:0] is rewired to D[0:39].	R	Compile-time specific
0	csr_byte reversal	Byte reversal for LSB/MSB first serialization. This is a compile-time option which needs to be set before IP generation. 0 = LSB-first serialization Byte order = {octet3, octet2, octet1, octet0} 1 = MSB-first serialization Byte order = {octet0, octet1, octet2, octet3} Note: JESD204B converter device may support either MSB-first serialization or LSB-first serialization. When `csr_byte_reversal` = 1, the byte order is reversed before transmitting data.	R	Compile-time specific

Table 29. lane_ctrl_0Lane control and assignment for Lane 0.
Offset: 0x4
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl0	Physical lane control reserve register	RW	0x0
1	csr_lane0_powerdown	Power down control for lane 0. This register routes out of the IP as `csr_lane_powerdown[0]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane0_polarity	Set 1 to inverse lane 0 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 30. lane_ctrl_1Lane control and assignment for Lane 1.
Offset: 0x8
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl1	Physical lane control reserve register	RW	0x0
1	csr_lane1_powerdown	Power down control for lane 1. This register routes out of the IP as `csr_lane_powerdown[1]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane1_polarity	Set 1 to inverse lane 1 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 31. lane_ctrl_2Lane control and assignment for Lane 2.
Offset: 0xC
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl2	Physical lane control reserve register	RW	0x0
1	csr_lane2_powerdown	Power down control for lane 2. This register routes out of the IP as `csr_lane_powerdown[2]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane2_polarity	Set 1 to inverse lane 2 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 32. lane_ctrl_3Lane control and assignment for Lane 3.
Offset: 0x10
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl3	Physical lane control reserve register	RW	0x0
1	csr_lane3_powerdown	Power down control for lane 3. This register routes out of the IP as `csr_lane_powerdown[3]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane3_polarity	Set 1 to inverse lane 3 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 33. lane_ctrl_4Lane control and assignment for Lane 4.
Offset: 0x14
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl4	Physical lane control reserve register	RW	0x0
1	csr_lane4_powerdown	Power down control for lane 4. This register routes out of the IP as `csr_lane_powerdown[4]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane4_polarity	Set 1 to inverse lane 4 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 34. lane_ctrl_5Lane control and assignment for Lane 5.
Offset: 0x18
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl5	Physical lane control reserve register	RW	0x0
1	csr_lane5_powerdown	Power down control for lane 5. This register routes out of the IP as `csr_lane_powerdown[5]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane5_polarity	Set 1 to inverse lane 5 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 35. lane_ctrl_6Lane control and assignment for Lane 6.
Offset: 0x1C
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl6	Physical lane control reserve register	RW	0x0
1	csr_lane6_powerdown	Power down control for lane 6. This register routes out of the IP as `csr_lane_powerdown[6]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane6_polarity	Set 1 to inverse lane 6 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 36. lane_ctrl_7Lane control and assignment for Lane 7.
Offset: 0x20
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	rl7	Physical lane control reserve register	RW	0x0
1	csr_lane7_powerdown	Power down control for lane 7. This register routes out of the IP as `csr_lane_powerdown[7]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x0
0	csr_lane7_polarity	Set 1 to inverse lane 7 polarity. When set, the TX interface inverts the polarity of the TX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 37. dll_ctrlData link layer (DLL) and TX control.
Offset: 0x50
Bit	Name	Description	Attribute	Reset
31:17	Reserved	Reserved	R	0x0
16	rd5	DLL control reserve register 5	RW	0x0
15	rd4	DLL control reserve register 4	RW	0x0
14	rd3	DLL control reserve register 3	RW	0x0
13	rd2	DLL control reserve register 2	RW	0x0
12	rd1	DLL control reserve register 1	RW	0x0
11	csr_reinit_rxsyncn_rise	Control CGS state exit behavior during link reinitialization through `syncn_sysref_ctrl` (0x54) `csr_link_reinit`. 0 = Exit CGS state without detected SYNC~ rise from DAC converter. (Default) If this mode is entered, transmitter shall transmit at least four /K28.5/ symbols and exit CGS state at next LMFC boundary during link re-initialization. 1 = Exit CGS state only when detected SYNC~ rise from DAC converter. If this mode is entered, transmitter shall stays at CGS state and transmit /K28.5/ symbols until detected SYNC~ rise then exit CGS state at next LMFC boundary during link re-initialization.	RW	0x0
10	test_ilas_loop	Write 1 to this register will force the state machine to stay in Initial Lane Alignment Sequence (ILAS) state indefinitely after entry. ILAS Configuration will be transmitted during the second ILAS multiframe. The rest of the multiframe will have the start-of-multiframe character (/R/) followed by dummy data and end-of-multiframe (/A/). There are 2 modes of entry per JESD204B Specification, chapter 5.3.3.8.2: If this mode is entered when receiver initiates synchronization request, transmitter shall initiate CGS. Upon completion of CGS, transmitter shall repeatedly transmit ILAS. If there is no synchronization request upon test entry, transmitter shall transmit at least four /K28.5/ symbols. At the LMFC boundary, the transmitter shall repeatedly transmit ILAS.	RW	0x0
9	csr_char_repl_disable	Disable character replacement for debug purposes. When this bit is set, end-of-frame (/F/) and end-of-multiframe (/A/) character replacement will be disabled. 0 = Character replacement enabled (Default) 1 = Character replacement disabled. Used for debug purposes.	RW	0x0
8:1	csr_ilas_multiframe	The counter is binary value minus 1. ILAS required by subclass 1 and 2 consists of exactly 4 multiframes. However, configurations with multiple subclass 0 DAC devices may require additional multiframes to achieve lane alignment. Therefore, the length of ILAS shall be programmable from 4 up to 256 multiframes. When illegal values like 0/1/2 is set, the IP will still run as 4 multiframes. Note: This counter value takes effect regardless of subclass setting. Do not to change this register for Subclass 1 and Subclass 2.	RW	0x0
0	csr_lane_sync_en	Lane synchronization enable is required multilane alignment for a JESD204B link. 0 = Lane synchronization is disabled. ILAS will be bypassed. The character replacement of user data during end of multiframe will be considered as end of frame. 1 = Lane synchronization enabled (Default) Note: For device that is classified as NMCDA-SL, you can disable lane synchronization. Set this bit to 1 for all other devices.	RW	0x0

Table 38. syncn_sysref_ctrlSYNC_N and SYSREF control. Controls event sequencing related to `SYNC_N` and `SYSREF` signals.
Offset: 0x54
Bit	Name	Description	Attribute	Reset
31:21	Reserved	Reserved	R	0x0
20	csr_cgs_bypass_sysref	This bit applies to Subclass 1 only. Enabling DLL states transition from Code Group Synchronization (CGS) to Initial Lane Alignment Sequence (ILAS) to bypass `SYSREF` single detect sampling. By default, the JESD204B IP will remain in CGS state until `SYSREF` is sampled. Once `csr_sysref_singledet` is cleared, then only the DLL state can transition from CGS to ILAS on the next LMFC tick. Write 1 to this register to allow the IP to exit out of CGS state without ensuring that at least one rising edge of `SYSREF` was sampled. Note: This is a debug mode, where you can bypass `SYSREF` sampling if only a quick link up is required. Setting this bit to 1 may cause race condition between `SYSREF` sampling and CGS exit.	RW	0x0
19:12	csr_lmfc_offset	The Local Multiframe Clock (LMFC) offset is a binary value minus 1. Upon the detection of the rising edge of `SYSREF` in continuous mode or single detect mode, the LMFC counter will be reset to the value set in `csr_lmfc_offset`. The LMFC counter operates in link clock domain, therefore the legal value for the counter is from 0 to ((FxK/4)-1. If you set an out-of-range value, the LMFC offset internally resets to 0. Note: By default, the rising edge of `SYSREF` will reset the LMFC counter to 0. However, if the system design has large phase offset between the `SYSREF` sampled by the converter device and the FPGA, you can virtually shift the `SYSREF` edges by changing the LMFC offset reset value using this register.	RW	0x0
11:7	Reserved	Reserved	R	0x0
6	rs4	SYNCN and SYSREF control reserve register 4	RW	0x0
5	rs3	SYNCN and SYSREF control reserve register 3	RW	0x0
4	rs2	SYNCN and SYSREF control reserve register 2	RW	0x0
3	rs1	SYNCN and SYSREF control reserve register 1	RW	0x0
2	csr_sysref_singledet	This register enables LMFC realignment with a single sample of rising edge of `SYSREF`. The bit is auto-cleared by hardware once `SYSREF` is sampled. If you require `SYSREF` to be sampled again (due to link reset or reinitialization), you must set this bit again. This register also has another critical function. The JESD204B IP will never will never exit out of CGS unless at least a `SYSREF` edge is sampled. This is to prevent race condition between `SYSREF` being sampled and the exit of CGS to ILAS. If CGS transition to ILAS before the common `SYSREF` is sampled for both the IP and converter device, this would cause undeterministic latency as the transmitted ILAS is based on the free running LMFC counter coming out of reset. 0 = Any rising edge of `SYSREF` will not reset the LMFC counter. 1 = Resets the LMFC counter on the first rising edge of `SYSREF` and then clears this bit. (Default) Note: Intel recommends that you use `csr_sysref_singledet` with `csr_sysref_alwayson` even if you want to do `SYSREF` continuous detection mode. This is because this register is able to indicate whether `SYSREF` was ever sampled. This register also prevents race condition as mentioned above. Using only `SYSREF` single detect mode will not be able to detect incorrect `SYSREF` period.	RW	0x1
1	csr_sysref_alwayson	This register enables LMFC realignment at every rising edge of `SYSREF`. LMFC counter is reset when every `SYSREF` transition from 0 to 1 is detected. 0 = Any rising edge of `SYSREF` will not reset the LMFC counter. 1 = Continuously resets LMFC counter at every `SYSREF` rising edge. Note: When this bit is set, the `SYSREF` period will be checked to ensure it never violates internal local multiframe period and this period can only be n-integer multiplied of ((FxK)/4. If the `SYSREF` period is different from the local multiframe period, `tx_err` (0x60) `csr_sysref_lmfc_err` will be asserted and an interrupt will be triggered. If you want to change `SYSREF` period, this bit should be set to 0 first. After `SYSREF` clock has stabilized, this bit is set to 1 to sample the rising edges of the new `SYSREF`.	RW	0x0
0	csr_link_reinit	The JESD204B IP will reinitialize the link to enter Code Group Synchronization by transmitting /K28.5. The software will need to check that SYNC_N `tx_status0` (0x80) `csr_dev_syncn` is 1 before setting this register. This bit automatically clears once link reinitialization is entered by hardware. 0 = No link reinit request (Default) 1 = Reinitialize the link.	RW	0x0

Table 39. tx_errThis register logs errors detected in the FPGA IP. Each set bit in the register will generate interrupt, if enabled by corresponding bits in the TX Error Enable (*tx_err_enable (0x64)*). After servicing the interrupt, the software must clear the appropriate serviced interrupt status bit and ensure that no other interrupts are pending.
Offset: 0x60
Bit	Name	Description	Attribute	Reset
31:9	Reserved	Reserved	R	0x0
8	re4	TX error reserve status 4	RW	0x0
7	csr_pcfifo_empty_err	Detected 1 or more lanes of Phase Compensation FIFO is empty unexpectedly when the JESD204B link is running. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 devices. Note: You MUST reset the JESD204B link if this bit is triggered. The transceiver channel, and the IP link reset must be applied.	RW1C	0x0
6	csr_pcfifo_full_err	Detected 1 or more lanes of Phase Compensation FIFO is full unexpectedly when the JESD204B link is running. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 devices. Note: You MUST reset the JESD204B link if this bit is triggered. The transceiver channel, and the IP link reset must be applied.	RW1C	0x0
5	csr_pll_locked_err	Detected 1 or more lanes of PLL locked loose lock when the JESD204B link is running. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW1C	0x0
4	csr_syncn_reinit_req	Receiver has requested reinitialization by asserting `SYNC_N` low for more than 5 frames and 9 octets. Note: Upon the detection of `SYNC_N` link reinitialization request from the receiver, the JESD204B IP enters Code Group Synchronization (CGS) and transmits continuous /K28.5/. If you want to regenerate and sample `SYSREF`, enabling this interrupt notifies the software that the receiver has requested for link reinitialization.	RW1C	0x0
3	csr_frame_data_invalid_err	This error bit is applicable only if you use the Intel FPGA transport layer in your design. This error bit will be asserted if the upstream component deasserts the `jesd204_tx_data_valid` signal at the Intel FPGA transport layer AV-ST bus. The transport layer expects the upstream device in the system to always send the valid data with zero latency when `jesd204_tx_data_ready` is asserted by the transport layer. Note: If this error detection is not required, you can tie off the `jesd204_tx_frame_error` signal to 0.	RW1C	0x0
2	csr_dll_data_invalid_err	This error bit will be asserted if the TX detects data invalid on the AV-ST bus when data is requested. By design, the JESD204B TX core expects the upstream device (JESD204B transport layer) to always send the valid data with zero latency when `jesd204_tx_data_ready` is asserted. Note: If this error detection is not required, you can tie off the `jesd204_tx_link_valid` signal to 1.	RW1C	0x0
1	csr_sysref_lmfc_err	When `syncn_sysref_ctrl` (0x54) `csr_sysref_alwayson` is set to 1, the LMFC counter checks whether the `SYSREF` period matches the LMFC counter where it is n-integer multiplier of the (FxK/4). If `SYSREF` period does not match the LMFC period, this bit will be asserted.	RW1C	0x0
0	csr_syncn_err	The JESD204B receiver indicates error through the `SYNC_N` signal.	RW1C	0x0

Table 40. tx_err_enableThis register enables the error types that will generate interrupt. Setting 0 to the register bits will disable the specific error type from generating interrupt.
Offset: 0x64
Bit	Name	Description	Attribute	Reset
31:9	Reserved	Reserved	R	0x0
8	re4_en	TX error enable reserve 4	RW	0x1
7	csr_pcfifo_empty_err_en	Enable interrupt for Phase Compensation FIFO empty error	RW	0x1
6	csr_pcfifo_full_err_en	Enable interrupt for Phase Compensation FIFO full error	RW	0x1
5	csr_pll_locked_err_en	Enable interrupt for PLL loose lock error. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	RW	0x1
4	csr_syncn_reinit_req_en	Enable interrupt for SYNCN reinit request.	RW	0x1
3	csr_frame_data_invalid_err_en	Enable interrupt for transport layer data invalid error type.	RW	0x0
2	csr_dll_data_invalid_err_en	Enable interrupt for DLL data invalid error type.	RW	0x0
1	csr_sysref_lmfc_err_en	Enable interrupt for SYSREF LMFC error type.	RW	0x0
0	csr_syncn_err_en	Enable interrupt for SYNC_N error type.	RW	0x1

Table 41. tx_status0Monitor ports of internal signals and counter which will be useful for debug.
Offset: 0x80

Note: The bits that are compile-time specific are not configurable through register. You must recompile to change the value.)
Bit	Name	Description	Attribute	Reset
31:21	Reserved	Reserved	R	0x0
20:13	csr_dbg_adjcnt	Number of adjustment resolution steps of DAC LMFC in device link clock resolution. Applies to Subclass 2 only. Note: For Subclass 2 operations, the JESD204B IP calculates the phase of the `SYNC_N` deassertion from the receiver with respect to internal LMFC counter. Interrupt will be triggered with either `tx_err` (0x60) `csr_syncn_err` or `csr_syncn_reinit_req` set. This register along with `csr_dbg_adjdir` and `csr_dbg_phadj` latch the phase offset, direction and resolution based on phase detection using link clock. Hysteresis and device clock ratio calculation should be done in the software.	R	0x0
12	csr_dbg_adjdir	Adjustment direction of DAC LMFC to the nearest LMFC tick. Applies to Subclass 2 only. 0 = Advance 1 = Delay Note: For Subclass 2 operations, the JESD204B IP calculates the phase of the `SYNC_N` deassertion from the receiver with respect to internal LMFC counter. Interrupt will be triggered with either `tx_err` (0x60) `csr_syncn_err` or `csr_syncn_reinit_req` set. This register along with `csr_dbg_phadj` and `csr_dbg_adjcnt` latch the phase offset, direction and resolution based on phase detection using link clock. Hysteresis and device clock ratio calculation should be done in the software.		0x0
11	csr_dbg_phadj	`SYNC_N` deassertion is not-in-phase with the internal LMFC counter. Applies to Subclass 2 only. 0 = DAC LMFC is aligned to device LMFC. 1 = DAC LMFC is NOT aligned to device LMFC Note: For Subclass 2 operations, the JESD204B IP calculates the phase of the `SYNC_N` deassertion from the receiver with respect to internal LMFC counter. Interrupt will be triggered with either `tx_err` (0x60) `csr_syncn_err` or `csr_syncn_reinit_req` set. This register along with `csr_dbg_adjdir` and `csr_dbg_adjcnt` latch the phase offset, direction and resolution based on phase detection using link clock. Hysteresis and device clock ratio calculation should be done in the software.		0x0
10:3	csr_ilas_cnt	This register is a binary minus 1 value. The counter value reflects on which number of ILAS multiframe the DLL state machine is in.	R	0x0
2	csr_dll_state	Current state of data link layer (DLL). 00 = Code Group Synchronization (CGS) 01 = Initial Lane Alignment Sequence (ILAS) 10 = User Data Mode 11 = D21.5 test mode	R	0x0
1:0	csr_dev_syncn	Internal `SYNC_N` value. 0 = Receiver is asserting synchronization request. 1 = JESD204B link is out of synchronization.	R	0x0

Table 42. tx_status1Monitor ports of internal signals and counter which will be useful for debug.
Offset: 0x84
Bit	Name	Description	Attribute	Reset
31:24	Reserved	Reserved	R	0x0
23	csr_lane7_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 7	R	0x0
22	csr_lane6_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 6	R	0x0
21	csr_lane5_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 5	R	0x0
20	csr_lane4_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 4	R	0x0
19	csr_lane3_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 3	R	0x0
18	csr_lane2_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 2	R	0x0
17	csr_lane1_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 1	R	0x0
16	csr_lane0_tx_pcfifo_empty	TX phase compensation FIFO status empty flag for lane 0	R	0x0
15:8	Reserved	Reserved	R	0x0
7	csr_lane7_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 7	R	0x0
6	csr_lane6_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 6	R	0x0
5	csr_lane5_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 5	R	0x0
4	csr_lane4_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 4	R	0x0
3	csr_lane3_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 3	R	0x0
2	csr_lane2_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 2	R	0x0
1	csr_lane1_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 1	R	0x0
0	csr_lane0_tx_pcfifo_full	TX phase compensation FIFO status full flag for lane 0	R	0x0

Table 43. tx_status2Monitor ports of internal signals and counter which will be useful for debug.
Offset: 0x88
Bit	Name	Description	Attribute	Reset
31:24	Reserved	Reserved	R	0x0
23	csr_lane7_pll_locked	PLL status for lane 7, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
22	csr_lane6_pll_locked	PLL status for lane 6, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
21	csr_lane5_pll_locked	PLL status for lane 5, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
20	csr_lane4_pll_locked	PLL status for lane 4, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
19	csr_lane3_pll_locked	PLL status for lane 3, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
18	csr_lane2_pll_locked	PLL status for lane 2, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
17	csr_lane1_pll_locked	PLL status for lane 1, indicates PLL is locked. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
16	csr_lane0_pll_locked	PLL status for lane 0, indicates PLL is locked. For bonded mode, the transceiver generates only one PLL locked signal. The single bit will be routed to lane 0 of PLL locked status. All other lanes will be tied off to 0. For non-bonded mode, PLL locked status will be per channel. The status will be routed to the respective PLL locked status per channel. For Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices, tie this register to 1’b1.	R	0x0
15:8	Reserved	Reserved	R	0x0
7	csr_lane7_tx_cal_busy	Reconfig status for lane 7, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
6	csr_lane6_tx_cal_busy	Reconfig status for lane 6, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
5	csr_lane5_tx_cal_busy	Reconfig status for lane 5, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
4	csr_lane4_tx_cal_busy	Reconfig status for lane 4, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
3	csr_lane3_tx_cal_busy	Reconfig status for lane 3, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
2	csr_lane2_tx_cal_busy	Reconfig status for lane 2, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
1	csr_lane1_tx_cal_busy	Reconfig status for lane 1, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices.	R	0x0
0	csr_lane0_tx_cal_busy	Reconfig status for lane 0, indicates TX calibration is in progress. Note: This status bit is not applicable for Intel^® Agilex™ and Intel^® Stratix^® 10 E-tile devices. .	R	0x0

Table 44. tx_status3TX status reserve..
Offset: 0x8C
Bit	Name	Description	Attribute	Reset
31:0	rs32	TX status reserve.	R	0x0

Table 45. ilas_data1Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0x94
Bit	Name	Description	Attribute	Reset
31:24	csr_m	Link M. Number of converters per device (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
23:21	Reserved	Reserved	R	0x0
20:16	csr_k	Link K. Number of frames per multiframe (binary value minus 1). A multiframe is defined as a group of K successive frames where K is between 1 and 32 and such that the number of octets per multiframe is between 17 and 1024. The IP requires that FxK must be divisible by 4. Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
15:8	csr_f	Link F. Number of octets per frame (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
7	csr_scr_en	Enable or disable descrambler. 0 = Disable descrambler 1 = Enable descrambler Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices. .	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
6:5	Reserved	Reserved	R	0x0
4:0	csr_l	Link L. Number of lanes per converter (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.

Table 46. ilas_data2Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0x98
Bit	Name	Description	Attribute	Reset
31	csr_hd	Link HD. High density format. Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
30:29	Reserved	Reserved	R	0x0
28:24	csr_cf	Link CF. Number of control words per frame clock period per link CF = L is encoded as 31: control words on all lanes. CF = 31 can only occur when L = 31 Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
23:21	csr_jesdv	JESD204x version. 000 = JESD204A 001 = JESD204B Note: Run-time reconfiguration is disabled for Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Stratix^® 10 RO for Intel^® Stratix^® 10 devices	0x1
20:16	csr_s	Link S. Number of samples per converter per frame cycle (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
15:13	csr_subclassv	Device subclass version 000 = Subclass 0 001 = Subclass 1 010 = Subclass 2 Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
12.8	csr_np	Link NP. Total number of bits per sample (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
7:6	csr_cs	Link CS. Number of control bits per sample. Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
5	Reserved	Reserved	R	0x0
4:0	csr_n	Link N. Converter resolution (binary value minus 1). Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.

Table 47. ilas_data3Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0x9C
Bit	Name	Description	Attribute	Reset
31	csr_phadj	Phase adjustment request of DAC LMFC. The register is auto-cleared by the hardware after sending ILAS 2nd multiframe. Applies to Subclass 2 only.	RW	Reset to parameter value per IP generation.
30	csr_adjdir	Adjustment direction of DAC LMFC. The register is auto-cleared by the hardware after sending ILAS 2nd multiframe. Applies to Subclass 2 only. 0 = Advance 1 = Delay	RW	Reset to parameter value per IP generation.
29:20	Reserved	Reserved	R	0x0
19:16	csr_f	Number of adjustment resolution steps of DAC LMFC. The register is auto-cleared by the hardware after sending ILAS 2nd multiframe. Applies to Subclass 2 only.	RW	Reset to parameter value per IP generation.
15:8	csr_rsvd2	ILAS reserved 2 bytes.	RW	0x00
7:0	csr_rsvd1	ILAS reserved 1 bytes.	RW	0x00

Table 48. ilas_data4Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0xA0
Bit	Name	Description	Attribute	Reset
31:29	Reserved	Reserved	R	0x0
28:24	csr_lid_l3	Lane Identification for lane 3 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
23:21	Reserved	Reserved	R	0x0
20:16	csr_lid_l2	Lane Identification for lane 2 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
15:13	Reserved	Reserved	R	0x0
12:8	csr_lid_l1	Lane Identification for lane 1 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
7:5	Reserved	Reserved	R	0x0
4:0	csr_lid_l0	Lane Identification for lane 0 transmitted during ILAS.	RW	Reset to parameter value per IP generation.

Table 49. ilas_data5Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0xA4
Bit	Name	Description	Attribute	Reset
31:29	Reserved	Reserved	R	0x0
28:24	csr_lid_l7	Lane Identification for lane 7 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
23:21	Reserved	Reserved	R	0x0
20:16	csr_lid_l6	Lane Identification for lane 6 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
15:13	Reserved	Reserved	R	0x0
12:8	csr_lid_l5	Lane Identification for lane 5 transmitted during ILAS.	RW	Reset to parameter value per IP generation.
7:5	Reserved	Reserved	R	0x0
4:0	csr_lid_l4	Lane Identification for lane 4 transmitted during ILAS.	RW	Reset to parameter value per IP generation.

Table 50. ilas_data8Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0xB0
Bit	Name	Description	Attribute	Reset
31:24	csr_fchk_l3	ILAS checksum lane 3. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
23:16	csr_fchk_l2	ILAS checksum lane 2. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
15:8	csr_fchk_l1	ILAS checksum lane 1. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
7:0	csr_fchk_l0	ILAS checksum lane 0. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.

Table 51. ilas_data9Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0xB4
Bit	Name	Description	Attribute	Reset
31:10	csr_fchk_l7	ILAS checksum lane 7. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
23:16	csr_fchk_l6	ILAS checksum lane 6. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
15:8	csr_fchk_l5	ILAS checksum lane 5. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.
7:0	csr_fchk_l4	ILAS checksum lane 4. Checksum is the modulo 256 of parameters listed ILAS configuration data.	RW	Reset to parameter value per IP generation.

Table 52. ilas_data12Link control configuration transmitted during initial lane alignment sequence (ILAS).
Offset: 0xC0
Bit	Name	Description	Attribute	Reset
31:10	Reserved	Reserved	R	0x0
9:2	csr_fxk_h	Upper bits of FxK[8:2]. This is a binary value minus 1. Link F multiply with Link K must be divisible by 4. Note: The IP runs on 32-bit data width boundary per channel, so you must always ensure that FxK must be divisible by 4. Note: Run-time reconfiguration is disabled for Intel^® Agilex™ and Intel^® Stratix^® 10 devices.	RW for all devices except Intel^® Agilex™ and Intel^® Stratix^® 10 RO for Intel^® Agilex™ and Intel^® Stratix^® 10 devices	Reset to parameter value per IP generation.
1:0	csr_fxk_l	Lower bits of FxK[1:0]. This is a binary value minus 1. Link F multiply with Link K must be divisible by 4. Note: The IP runs on 32-bit data width boundary per channel, so you must always ensure that FxK must be divisible by 4. FxK (in binary value minus 1) always results to a value of 2'b11in the lower 2 bits.	R	0x3

Table 53. tx_testJESD204 test control.
Offset: 0xD0
Bit	Name	Description	Attribute	Reset
31:4	Reserved	Reserved	R	0x0
3:0	csr_tx_testmode	b0xxx is reserved for the JESD204B IP and 'b1xxx is reserved for external components out of the JESD204B IP. JESD204B IP test mode: 0000 = No test (Default) 0001 = K28.5 0010 = D21.5 JESD204B IP reference design test mode: 1000 = Alternating Checkerboard 1001 = Ramp 1010 = PRBS	RW	0x0

Table 54. user_test_pattern_aTest pattern per sample per converter.
Offset: 0xD4
Bit	Name	Description	Attribute	Reset
31:16	test_pattern1	User test pattern 1.	RW	0x0000
15:0	test_pattern0	User test pattern 0.	RW	0x0000

Table 55. user_test_pattern_bTest pattern per sample per converter.
Offset: 0xD8
Bit	Name	Description	Attribute	Reset
31:16	test_pattern3	User test pattern 3.	RW	0x0000
15:0	test_pattern2	User test pattern 2.	RW	0x0000

Table 56. user_test_pattern_cTest pattern per sample per converter.
Offset: 0xDC
Bit	Name	Description	Attribute	Reset
31:16	test_pattern5	User test pattern 5.	RW	0x0000
15:0	test_pattern4	User test pattern 4.	RW	0x0000

Table 57. user_test_pattern_dTest pattern per sample per converter.
Offset: 0xE0
Bit	Name	Description	Attribute	Reset
31:16	test_pattern7	User test pattern 7.	RW	0x0000
15:0	test_pattern6	User test pattern 6.	RW	0x0000

4.7.3. Receiver Registers

Table 58. lane_ctrl_commonCommon lane control and assignment. The common lane control applies to all lanes in the link.
Offset: 0x0

Note: The bits that are compile-time specific are not configurable through register. You must recompile to change the value.)
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl	Physical lane control reserve register	RW	0x0
1	csr_bit_reversal	Bit reversal for LSB/MSB first serialization. This is a compile-time option which needs to be set before IP generation. 0 = LSB-first serialization 1 = MSB-first serialization Note: JESD204B converter device may support either MSB-first serialization or LSB-first serialization. You must set both `csr_byte_reversal` and `csr_bit_reversal` bits to 1 when generating the IP. When `csr_bit_reversal` = 1, the word aligner reverses the RX parallel data bits upon receiving the PMA deserialized data. For example; in 20-bit mode; D[19:0] is rewired to D[0:19] and in 40-bit mode; D[39:0] is rewired to D[0:39].	R	Compile-time specific
0	csr_byte_reversal	Byte reversal for LSB/MSB first serialization. This is a compile-time option which needs to be set before IP generation. 0 = LSB-first serialization Byte order = {octet3, octet2, octet1, octet0} 1 = MSB-first serialization Byte order = {octet0, octet1, octet2, octet3} Note: JESD204B converter device may support either MSB-first serialization or LSB-first serialization. When `csr_byte_reversal` = 1, the word aligner reverses the byte order.	R	Compile-time specific

Table 59. lane_ctrl_0Lane control and assignment for lane 0.
Offset: 0x4
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	csr_alllanes_patternalign_en	Enables word alignment to the specified pattern boundary alignment during link initialization. You should set this bit to 1 in normal operations. Note: You can disable this bit to debug bit slip error.	RW	0x1
1	csr_lane0_powerdown	Power down control for lane 0. This register routes out of the IP as `csr_lane_powerdown[0]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane0_polarity	Set 1 to inverse lane 0 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 60. lane_ctrl_1Lane control and assignment for lane 1.
Offset: 0x8
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl1	Physical lane control reserve register.	RW	0x1
1	csr_lane1_powerdown	Power down control for lane 1. This register routes out of the IP as `csr_lane_powerdown[1]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane1_polarity	Set 1 to inverse lane 1 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 61. lane_ctrl_2Lane control and assignment for lane 2.
Offset: 0xC
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl2	Physical lane control reserve register.	RW	0x1
1	csr_lane2_powerdown	Power down control for lane 2. This register routes out of the IP as `csr_lane_powerdown[2]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane2_polarity	Set 1 to inverse lane 2 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 62. lane_ctrl_3Lane control and assignment for lane 3.
Offset: 0x10
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl3	Physical lane control reserve register.	RW	0x1
1	csr_lane3_powerdown	Power down control for lane 3. This register routes out of the IP as `csr_lane_powerdown[3]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane3_polarity	Set 1 to inverse lane 3 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 63. lane_ctrl_4Lane control and assignment for lane 4.
Offset: 0x14
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl4	Physical lane control reserve register.	RW	0x1
1	csr_lane4_powerdown	Power down control for lane 4. This register routes out of the IP as `csr_lane_powerdown[4]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane4_polarity	Set 1 to inverse lane 4 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 64. lane_ctrl_5Lane control and assignment for lane 5.
Offset: 0x18
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl5	Physical lane control reserve register.	RW	0x1
1	csr_lane5_powerdown	Power down control for lane 5. This register routes out of the IP as `csr_lane_powerdown[2]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane5_polarity	Set 1 to inverse lane 5 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 65. lane_ctrl_6Lane control and assignment for lane 6.
Offset: 0x1C
Bit	Name	Description	Attribute	Reset
31:3	Reserved	Reserved	R	0x0
2	rl6	Physical lane control reserve register.	RW	0x1
1	csr_lane6_powerdown	Power down control for lane 6. This register routes out of the IP as `csr_lane_powerdown[6]`. The transport layer (TL) uses this signal to indicate the fall back of the lanes (L) for run-time LMF support. To save power, route this signal to the Transceiver Reset Controller block as an assert mask for `rx_digitalreset` and `rx_analogreset` to power down the lane. 0 = Normal mode 1 = Power down	RW	0x0
0	csr_lane6_polarity	Set 1 to inverse lane 6 polarity. When set, the RX interface inverts the polarity of the RX data. You can use this bit to correct the polarity of differential pairs if the transmission circuitry or board layout mistakenly swaps the positive and negative signals.	RW	0x0

Table 66. lane_ctrl_7Lane control and assignment for lane 7.
Offset: 0x20
Bit	Name

F Parameter

32-Bit Architecture

Avalon-ST Interface

Avalon-MM Interface

Character replacement for non-scrambled data

Character replacement for scrambled data

TX (Subclass 0)

TX (Subclass 1)

TX (Subclass 2)

RX (Subclass 0)

RX (Subclass 1)

RX (Subclass 2)

Example 1

Example 2

Example 3

Example 4 (When F=3, for Intel® Stratix® 10 devices only)

Example 4 (When F=3, for Intel^® Stratix^® 10 devices only)