JESD204B Intel® FPGA IP User Guide

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ID 683442
Date 5/05/2023
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Document Table of Contents
Document Table of Contents x
1. JESD204B IP Quick Reference 2. About the JESD204B Intel® FPGA IP 3. Getting Started 4. JESD204B IP Functional Description 5. JESD204B IP Deterministic Latency Implementation Guidelines 6. JESD204B IP Debug Guidelines 7. JESD204B Intel® FPGA IP User Guide Archives 8. Document Revision History for the JESD204B Intel® FPGA IP User Guide
2. About the JESD204B Intel® FPGA IP x
2.1. Release Information 2.2. Device Family Support 2.3. Datapath Modes 2.4. IP Variation 2.5. JESD204B IP Configuration 2.6. Channel Bonding 2.7. Performance and Resource Utilization
2.5. JESD204B IP Configuration x
2.5.1. Run-Time Configuration
3. Getting Started x
3.1. Introduction to Intel® FPGA IP Cores 3.2. Installing and Licensing Intel® FPGA IP Cores 3.3. Intel® FPGA IP Evaluation Mode 3.4. Upgrading IP Cores 3.5. IP Catalog and Parameter Editor 3.6. Design Walkthrough 3.7. JESD204B Design Examples 3.8. JESD204B IP Design Considerations 3.9. JESD204B Intel® FPGA IP Parameters 3.10. JESD204B IP Component Files 3.11. JESD204B IP Testbench
3.6. Design Walkthrough x
3.6.1. Creating a New Intel® Quartus® Prime Project 3.6.2. Parameterizing and Generating the IP 3.6.3. Compiling the JESD204B IP Core Design 3.6.4. Programming an FPGA Device
3.8. JESD204B IP Design Considerations x
3.8.1. Integrating the JESD204B IP in Platform Designer 3.8.2. Pin Assignments 3.8.3. Adding External Transceiver PLLs 3.8.4. Timing Constraints For Input Clocks
3.11. JESD204B IP Testbench x
3.11.1. Generating and Simulating the IP Testbench 3.11.2. Testbench Simulation Flow
3.11.1. Generating and Simulating the IP Testbench x
3.11.1.1. Generating the Testbench Simulation Model 3.11.1.2. Simulating the IP Testbench
4. JESD204B IP Functional Description x
4.1. Transmitter 4.2. Receiver 4.3. Operation 4.4. Clocking Scheme 4.5. Reset Scheme 4.6. Signals 4.7. Registers
4.1. Transmitter x
4.1.1. TX Data Link Layer 4.1.2. TX PHY Layer
4.1.1. TX Data Link Layer x
4.1.1.1. TX CGS 4.1.1.2. TX ILAS 4.1.1.3. User Data Phase
4.2. Receiver x
4.2.1. RX Data Link Layer 4.2.2. RX PHY Layer
4.2.1. RX Data Link Layer x
4.2.1.1. RX CGS 4.2.1.2. Frame Synchronization 4.2.1.3. Frame Alignment 4.2.1.4. Lane Alignment 4.2.1.5. ILAS Data 4.2.1.6. Initial Lane Synchronization
4.3. Operation x
4.3.1. Operating Modes 4.3.2. Scrambler/Descrambler 4.3.3. SYNC_N Signal 4.3.4. Link Reinitialization 4.3.5. Link Startup Sequence 4.3.6. Error Reporting Through SYNC_N Signal
4.3.1. Operating Modes x
4.3.1.1. Subclass 0 Operating Mode 4.3.1.2. Subclass 1 Operating Mode 4.3.1.3. Subclass 2 Operating Mode
4.4. Clocking Scheme x
4.4.1. Device Clock 4.4.2. Link Clock 4.4.3. Local MultiFrame Clock 4.4.4. Clock Correlation 4.4.5. Transceiver Calibration Clock Source
4.5. Reset Scheme x
4.5.1. Reset Sequence 4.5.2. ADC–FPGA Subsystem Reset Sequence 4.5.3. FPGA–DAC Subsystem Reset Sequence
4.6. Signals x
4.6.1. Transmitter Signals 4.6.2. Receiver Signals
4.7. Registers x
4.7.1. Register Access Type Convention 4.7.2. Transmitter Registers 4.7.3. Receiver Registers
5. JESD204B IP Deterministic Latency Implementation Guidelines x
5.1. Constraining Incoming SYSREF Signal 5.2. Programmable RBD Offset 5.3. Programmable LMFC Offset 5.4. Maintaining Deterministic Latency during Link Reinitialization
6. JESD204B IP Debug Guidelines x
6.1. Clocking Scheme 6.2. JESD204B Parameters 6.3. SPI Programming 6.4. Converter and FPGA Operating Conditions 6.5. Signal Polarity and FPGA Pin Assignment 6.6. Creating a Signal Tap Debug File to Match Your Design Hierarchy 6.7. Debugging JESD204B Link Using System Console
6.6. Creating a Signal Tap Debug File to Match Your Design Hierarchy x
6.6.1. Removing Irrelevant Signals and Adding E-Tile PHY Signals
1. JESD204B IP Quick Reference
2. About the JESD204B Intel® FPGA IP
3. Getting Started
4. JESD204B IP Functional Description
5. JESD204B IP Deterministic Latency Implementation Guidelines
6. JESD204B IP Debug Guidelines
7. JESD204B Intel® FPGA IP User Guide Archives
8. Document Revision History for the JESD204B Intel® FPGA IP User Guide

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 20 and Figure 21. 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 20. JESD204B Subsystem with Shared Transceiver Reference Clock and Core Clock
Note: This diagram is not applicable for Intel Agilex® 7 and Intel® Stratix® 10 E-tile devices.


Figure 21. JESD204B Subsystem with Separate Transceiver Reference Clock and Core Clock


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