Arria® V Device Handbook: Volume 2: Transceivers

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ID 683573
Date 5/29/2020
Public
Document Table of Contents
Document Table of Contents x
1. Transceiver Architecture in Arria V Devices 2. Transceiver Clocking in Arria V Devices 3. Transceiver Reset Control in Arria V Devices 4. Transceiver Protocol Configurations in Arria V Devices 5. Transceiver Custom Configurations in Arria V Devices 6. Transceiver Configurations in Arria V GZ Devices 7. Transceiver Loopback Support in Arria V Devices 8. Dynamic Reconfiguration in Arria V Devices
1. Transceiver Architecture in Arria V Devices x
1.1. Architecture Overview 1.2. PCS Architecture 1.3. Channel Bonding 1.4. PLL Sharing 1.5. Document Revision History
1.1. Architecture Overview x
1.1.1. Transceiver Banks 1.1.2. 10-Gbps Support Capability in GT and ST Devices 1.1.3. Transceiver Channel Architecture 1.1.4. PMA Architecture
1.1.2. 10-Gbps Support Capability in GT and ST Devices x
1.1.2.1. Enhanced Small Form-Factor Pluggable (SFP+) Interface 1.1.2.2. 10GBASE-KR Support 1.1.2.3. 9.8 Gbps CPRI Application
1.1.4. PMA Architecture x
1.1.4.1. Transmitter PMA Datapath 1.1.4.2. Receiver PMA Datapath 1.1.4.3. Transmitter PLL 1.1.4.4. Clock Divider 1.1.4.5. Calibration Block
1.1.4.1. Transmitter PMA Datapath x
1.1.4.1.1. Serializer 1.1.4.1.2. Transmitter Buffer
1.1.4.2. Receiver PMA Datapath x
1.1.4.2.1. Receiver Buffer 1.1.4.2.2. Channel PLL 1.1.4.2.3. Deserializer
1.1.4.3. Transmitter PLL x
1.1.4.3.1. Auxiliary Transmit (ATX) PLL Architecture 1.1.4.3.2. CMU PLL 1.1.4.3.3. fPLL as Transmitter PLL
1.1.4.5. Calibration Block x
1.1.4.5.1. Offset Cancellation in the Receiver Buffer and Receiver CDR 1.1.4.5.2. ATX PLL Calibration for Arria V GZ Devices 1.1.4.5.3. Calibration Block Boundary
1.2. PCS Architecture x
1.2.1. Transmitter PCS Datapath for Arria V GX, SX, GT, and ST Devices and Arria V GZ Standard PCS 1.2.2. Receiver PCS Datapath for Arria V GX, SX, GT, and ST Devices and Arria V GZ Standard PCS 1.2.3. 10G PCS Architecture for Arria V GZ Devices 1.2.4. PCIe Gen3 PCS Architecture
1.2.1. Transmitter PCS Datapath for Arria V GX, SX, GT, and ST Devices and Arria V GZ Standard PCS x
1.2.1.1. Transmitter Phase Compensation FIFO 1.2.1.2. Byte Serializer 1.2.1.3. 8B/10B Encoder 1.2.1.4. Transmitter Bit-Slip
1.2.1.1. Transmitter Phase Compensation FIFO x
1.2.1.1.1. Phase Compensation Mode 1.2.1.1.2. Registered Mode
1.2.1.3. 8B/10B Encoder x
1.2.1.3.1. 8B/10B Encoder in Single-Width Mode 1.2.1.3.2. 8B/10B Encoder in Double-Width Mode 1.2.1.3.3. Running Disparity Control 1.2.1.3.4. Encoder Output During Reset Sequence
1.2.2. Receiver PCS Datapath for Arria V GX, SX, GT, and ST Devices and Arria V GZ Standard PCS x
1.2.2.1. Word Aligner 1.2.2.2. Rate Match FIFO 1.2.2.3. 8B/10B Decoder 1.2.2.4. Byte Deserializer 1.2.2.5. Byte Ordering 1.2.2.6. Receiver Phase Compensation FIFO
1.2.2.1. Word Aligner x
1.2.2.1.1. Word Aligner in Manual Alignment Mode 1.2.2.1.2. Bit-Slip Mode 1.2.2.1.3. Word Aligner in Automatic Synchronization State Machine Mode 1.2.2.1.4. Word Aligner in Deterministic Latency State Machine Mode 1.2.2.1.5. Programmable Run-Length Violation Detection 1.2.2.1.6. Receiver Polarity Inversion 1.2.2.1.7. Bit Reversal 1.2.2.1.8. Receiver Byte Reversal
1.2.2.3. 8B/10B Decoder x
1.2.2.3.1. 8B/10B Decoder in Single-Width Mode 1.2.2.3.2. 8B/10B Decoder in Double-Width Mode
1.2.2.5. Byte Ordering x
1.2.2.5.1. Byte Ordering in Single-Width Mode 1.2.2.5.2. Byte Ordering in Double-Width Mode 1.2.2.5.3. Word Aligner-Based Ordering Mode 1.2.2.5.4. Manual Ordering Mode
1.2.2.6. Receiver Phase Compensation FIFO x
1.2.2.6.1. Phase Compensation Mode 1.2.2.6.2. Registered Mode
1.2.3. 10G PCS Architecture for Arria V GZ Devices x
1.2.3.1. Transmitter 10G PCS Datapath 1.2.3.2. Receiver 10G PCS Datapath
1.2.3.1. Transmitter 10G PCS Datapath x
1.2.3.1.1. Transmitter FIFO 1.2.3.1.2. Frame Generator 1.2.3.1.3. CRC-32 Generator 1.2.3.1.4. 64B/66B Encoder 1.2.3.1.5. Scrambler 1.2.3.1.6. Disparity Generator 1.2.3.1.7. Transmitter Gearbox
1.2.3.2. Receiver 10G PCS Datapath x
1.2.3.2.1. Receiver Gearbox 1.2.3.2.2. Block Synchronizer 1.2.3.2.3. Disparity Checker 1.2.3.2.4. Descrambler 1.2.3.2.5. Frame Synchronizer 1.2.3.2.6. Bit-Error Rate (BER) Monitor 1.2.3.2.7. 64B/66B Decoder 1.2.3.2.8. CRC-32 Checker 1.2.3.2.9. Receiver FIFO
1.2.4. PCIe Gen3 PCS Architecture x
1.2.4.1. Transmitter PCIe Gen3 PCS Datapath 1.2.4.2. Receiver PCIe Gen3 PCS Datapath 1.2.4.3. PIPE Interface
1.2.4.1. Transmitter PCIe Gen3 PCS Datapath x
1.2.4.1.1. Phase Compensation FIFO (Shared with Standard PCS) 1.2.4.1.2. Scrambler 1.2.4.1.3. Encoder 1.2.4.1.4. Gearbox
1.2.4.2. Receiver PCIe Gen3 PCS Datapath x
1.2.4.2.1. Block Sync 1.2.4.2.2. Rate Match FIFO 1.2.4.2.3. Decoder 1.2.4.2.4. Descrambler
1.2.4.3. PIPE Interface x
1.2.4.3.1. Auto Speed Negotiation Block 1.2.4.3.2. Electrical Idle Inference Block 1.2.4.3.3. Clock Data Recovery (CDR) Control Block
1.3. Channel Bonding x
1.3.1. Bonded Channel Configurations 1.3.2. Non-Bonded Channel Configurations
2. Transceiver Clocking in Arria V Devices x
2.1. Input Reference Clocking 2.2. Internal Clocking 2.3. FPGA Fabric–Transceiver Interface Clocking 2.4. Document Revision History
2.1. Input Reference Clocking x
2.1.1. Reference Clock Network 2.1.2. Dual-Purpose RX/refclk Pin 2.1.3. Fractional PLL (fPLL)
2.2. Internal Clocking x
2.2.1. Transmitter Clock Network 2.2.2. Transmitter Clocking 2.2.3. Receiver Clocking
2.2.2. Transmitter Clocking x
2.2.2.1. Non-Bonded Channel Configurations 2.2.2.2. Bonded Channel Configurations
2.2.3. Receiver Clocking x
2.2.3.1. Receiver Non-Bonded Channel Configurations 2.2.3.2. Receiver Bonded Channel Configurations
2.3. FPGA Fabric–Transceiver Interface Clocking x
2.3.1. Transceiver Datapath Interface Clocking 2.3.2. Transmitter Datapath Interface Clocking 2.3.3. Receiver Datapath Interface Clock 2.3.4. GXB 0 PPM Core Clock Assignment for GZ Devices
2.3.2. Transmitter Datapath Interface Clocking x
2.3.2.1. Quartus II-Software Selected Transmitter Datapath Interface Clock 2.3.2.2. Selecting a Transmitter Datapath Interface Clock
2.3.3. Receiver Datapath Interface Clock x
2.3.3.1. Quartus II Software-Selected Receiver Datapath Interface Clock 2.3.3.2. Selecting a Receiver Datapath Interface Clock
3. Transceiver Reset Control in Arria V Devices x
3.1. PHY IP Embedded Reset Controller 3.2. User-Coded Reset Controller 3.3. Transceiver Reset Using Avalon Memory Map Registers 3.4. Clock Data Recovery in Manual Lock Mode Resetting the Transceiver During Dynamic Reconfiguration 3.6. Transceiver Blocks Affected by the Reset and Powerdown Signals 3.7. Transceiver Power-Down 3.8. Document Revision History
3.1. PHY IP Embedded Reset Controller x
3.1.1. Embedded Reset Controller Signals 3.1.2. Resetting the Transceiver with the PHY IP Embedded Reset Controller During Device Power-Up 3.1.3. Resetting the Transceiver with the PHY IP Embedded Reset Controller During Device Operation
3.2. User-Coded Reset Controller x
3.2.1. User-Coded Reset Controller Signals 3.2.2. Resetting the Transmitter with the User-Coded Reset Controller During Device Power-Up 3.2.3. Resetting the Transmitter with the User-Coded Reset Controller During Device Operation 3.2.4. Resetting the Receiver with the User-Coded Reset Controller During Device Power-Up Configuration 3.2.5. Resetting the Receiver with the User-Coded Reset Controller During Device Operation
3.3. Transceiver Reset Using Avalon Memory Map Registers x
3.3.1. Transceiver Reset Control Signals Using Avalon Memory Map Registers
3.4. Clock Data Recovery in Manual Lock Mode x
3.4.1. Control Settings for CDR Manual Lock Mode 3.4.2. Resetting the Transceiver in CDR Manual Lock Mode
4. Transceiver Protocol Configurations in Arria V Devices x
4.1. PCI Express 4.2. Gigabit Ethernet 4.3. XAUI 4.4. 10GBASE-R 4.5. Serial Digital Interface 4.6. Gigabit-Capable Passive Optical Network (GPON) 4.7. Serial Data Converter (SDC) JESD204 4.8. SATA and SAS Protocols 4.9. Deterministic Latency Protocols—CPRI and OBSAI 4.10. Serial RapidIO 4.11. Document Revision History
4.1. PCI Express x
4.1.1. PCIe Transceiver Datapath 4.1.2. PCIe Supported Features 4.1.3. PIPE Transceiver Channel Placement Guidelines 4.1.4. PCIe Supported Configurations and Placement Guidelines 4.1.5. PIPE Transceiver Clocking
4.1.2. PCIe Supported Features x
4.1.2.1. PIPE Interface 4.1.2.2. Transmitter Electrical Idle Generation 4.1.2.3. Power State Management 4.1.2.4. 8B/10B Encoder Usage for Compliance Pattern Transmission Support 4.1.2.5. Receiver Status 4.1.2.6. Receiver Detection 4.1.2.7. Clock Rate Compensation Up to ±300 ppm 4.1.2.8. PCIe Reverse Parallel Loopback
4.2. Gigabit Ethernet x
4.2.1. Gigabit Ethernet Transceiver Datapath
4.3. XAUI x
4.3.1. Transceiver Datapath in a XAUI Configuration 4.3.2. XAUI Supported Features 4.3.3. Transceiver Clocking and Channel Placement Guidelines in XAUI Configuration
4.4. 10GBASE-R x
4.4.1. 10GBASE-R Transceiver Datapath Configuration 4.4.2. 10GBASE-R Supported Features 4.4.3. 10GBASE-R Transceiver Clocking
4.5. Serial Digital Interface x
4.5.1. Configurations Supported in SDI Mode 4.5.2. Serial Digital Interface Transceiver Datapath
4.9. Deterministic Latency Protocols—CPRI and OBSAI x
4.9.1. Latency Uncertainty Removal with the Phase Compensation FIFO in Register Mode 4.9.2. Channel PLL Feedback for Deterministic Relationship 4.9.3. CPRI and OBSAI 4.9.4. CPRI Enhancements
5. Transceiver Custom Configurations in Arria V Devices x
5.1. Standard PCS Configuration 5.2. Standard PCS in Low Latency Configuration 5.3. PMA Direct 5.4. Document Revision History
5.1. Standard PCS Configuration x
5.1.1. Custom Configuration Channel Options 5.1.2. Rate Match FIFO in Custom Configuration
5.1.2. Rate Match FIFO in Custom Configuration x
5.1.2.1. Rate Match FIFO Behaviors in Custom Single-Width Mode 5.1.2.2. Rate Match FIFO Behaviors in Custom Double-Width Mode
5.2. Standard PCS in Low Latency Configuration x
5.2.1. Low Latency Custom Configuration Channel Options
6. Transceiver Configurations in Arria V GZ Devices x
6.1. 10GBASE-R and 10GBASE-KR 6.2. Interlaken 6.3. PCI Express (PCIe)—Gen1, Gen2, and Gen3 6.4. XAUI 6.5. CPRI and OBSAI—Deterministic Latency Protocols 6.6. Transceiver Configurations 6.7. Native PHY IP Configuration 6.8. Document Revision History
6.1. 10GBASE-R and 10GBASE-KR x
6.1.1. 10GBASE-R and 10GBASE-KR Transceiver Datapath Configuration 6.1.2. 10GBASE-R and 10GBASE-KR Supported Features 6.1.3. 1000BASE-X and 1000BASE-KX Transceiver Datapath 6.1.4. 1000BASE-X and 1000BASE-KX Supported Features 6.1.5. Synchronization State Machine Parameters in 1000BASE-X and 1000BASE-KX Configurations 6.1.6. Transceiver Clocking in 10GBASE-R, 10GBASE-KR, 1000BASE-X, and 1000BASE-KX Configurations
6.2. Interlaken x
6.2.1. Transceiver Datapath Configuration 6.2.2. Supported Features 6.2.3. Transceiver Clocking
6.3. PCI Express (PCIe)—Gen1, Gen2, and Gen3 x
6.3.1. Transceiver Datapath Configuration 6.3.2. Supported Features for PCIe Configurations 6.3.3. Supported Features for PCIe Gen3 6.3.4. Transceiver Clocking and Channel Placement Guidelines 6.3.5. Advanced Channel Placement Guidelines for PIPE Configurations 6.3.6. Transceiver Clocking for PCIe Gen3
6.4. XAUI x
6.4.1. Transceiver Datapath in a XAUI Configuration 6.4.2. Supported Features 6.4.3. Transceiver Clocking and Channel Placement Guidelines
6.5. CPRI and OBSAI—Deterministic Latency Protocols x
6.5.1. Transceiver Datapath Configuration 6.5.2. Phase Compensation FIFO in Register Mode 6.5.3. Channel PLL Feedback 6.5.4. CPRI and OBSAI
6.6. Transceiver Configurations x
6.6.1. Standard PCS Configurations—Custom Datapath 6.6.2. Standard PCS Configurations—Low Latency Datapath 6.6.3. Transceiver Channel Placement Guidelines 6.6.4. 10G PCS Configurations 6.6.5. Merging Instances
6.6.4. 10G PCS Configurations x
6.6.4.1. 10G PCS Datapath Functionality 6.6.4.2. Using the coreclkin Ports
6.7. Native PHY IP Configuration x
6.7.1. Protocols and Transceiver PHY IP Support 6.7.2. Native PHY Transceiver Datapath Configuration 6.7.3. Standard PCS Features 6.7.4. 10G PCS Supported Features 6.7.5. 10G Datapath Configurations with Native PHY IP 6.7.6. PMA Direct Supported Features 6.7.7. Channel and PCS Datapath Dynamic Switching Reconfiguration
6.7.3. Standard PCS Features x
6.7.3.1. Standard PCS Receiver and Transmitter Blocks
6.7.4. 10G PCS Supported Features x
6.7.4.1. 10G PCS Receiver and Transmitter Blocks 6.7.4.2. Receiver and Transmit Gearbox in Native PHY IP
7. Transceiver Loopback Support in Arria V Devices x
7.1. Serial Loopback 7.2. Forward Parallel Loopback 7.3. PIPE Reverse Parallel Loopback 7.4. Reverse Serial Loopback 7.5. Reverse Serial Pre-CDR Loopback 7.6. Document Revision History
8. Dynamic Reconfiguration in Arria V Devices x
8.1. Dynamic Reconfiguration Features 8.2. Offset Cancellation 8.3. Transmitter Duty Cycle Distortion Calibration 8.4. PMA Analog Controls Reconfiguration 8.5. Dynamic Reconfiguration of Loopback Modes 8.6. Transceiver PLL Reconfiguration 8.7. Transceiver Channel Reconfiguration 8.8. Transceiver Interface Reconfiguration 8.9. Reduced .mif Reconfiguration 8.10. On-Chip Signal Quality Monitoring (Eye Viewer) 8.11. Adaptive Equalization 8.12. Decision Feedback Equalization 8.13. Unsupported Reconfiguration Modes 8.14. Document Revision History
1. Transceiver Architecture in Arria V Devices
2. Transceiver Clocking in Arria V Devices
3. Transceiver Reset Control in Arria V Devices
4. Transceiver Protocol Configurations in Arria V Devices
5. Transceiver Custom Configurations in Arria V Devices
6. Transceiver Configurations in Arria V GZ Devices
7. Transceiver Loopback Support in Arria V Devices
8. Dynamic Reconfiguration in Arria V Devices

2.2.1. Transmitter Clock Network

The transmitter PLL is comprised of the ATX PLL (for GZ devices only) , CMU PLL, and fPLL.

All CMU PLLs are identical in architecture, but vary in the following:

  • Usage capability: CMU PLL in channel 1 and 4 are capable of distributing a clock with accessibility to the transmitter clock network, while the rest only are able to clock the transmitter in the same channel only.
  • Performance: Up to 6.5536 Gbps in GX and SX, except for the CMU PLL of channel 1 and 4 in GT and ST devices, which are capable of up to 10.3125 Gbps. In GZ devices, the CMU PLL in channel 1 and channel 4 can drive any transceiver channel up to 12.5 Gbps.
Table 40.   Usage Capability of Each ATX PLL (for GZ devices) and CMU PLL Within a Transceiver Bank
CMU PLL Location in a Transceiver Bank Clock Network Access Maximum ATX / CMU PLL Performance (Gbps) Maximum CMU PLL Performance (Gbps) Usage Capability
GZ Devices only GX and SX Devices GT and ST Devices
CH 0 No 12.5 6.5536 6.5536 Clock transmitter within same channel only
CH 1 Yes 12.5 6.5536 10.3125 Clock transmitter within same channel only and other channels via clock network
CH 2 No 12.5 6.5536 6.5536 Clock transmitter within same channel only
CH 3 No 12.5 6.5536 6.5536 Clock transmitter within same channel only
CH 4 Yes 12.5 6.5536 10.3125 Clock transmitter within same channel only and other channels via clock network
CH 5 No 12.5 6.5536 6.5536 Clock transmitter within same channel only

The fPLLs adjacent to the transceiver banks provide an additional transmitter PLL source for clocking transceivers up to 3.125 Gbps. Two fPLLs are available as the transmitter PLL for every transceiver bank of six channels, or one fPLL for a bank of three channels.

The transmitter clock network routes the clock from the transmitter PLL to the transmitter channel. As shown in Figure 47 , the transmitter clock network routes the clock from the transmit PLL to the transmitter channel. A clock divider provides two clocks to the transmitter channel:

  • Serial clock—high-speed clock for the serializer
  • Parallel clock—low-speed clock for the serializer and the PCS

Arria V transceivers support non-bonded and bonded transceiver clocking configurations:

  • Non-bonded configuration—Only the serial clock from the transmit PLL is routed to the transmitter channel. The clock divider of each channel generates the local parallel clock. The x1 and xN (for Native PHY IP only) clock lines are used for non-bonded configurations. This configuration is available for both the 6-Gbps, 10-Gbps and 12.5 Gbps (GZ devices only) transceivers.
  • Bonded configuration—Both the serial clock and parallel clock are routed from the central clock divider in channel 1 or 4 to the bonded transmitter channels. The x6 and xN clock lines are used for bonded configurations. This configuration is only available for 6 Gbps transceivers. Arria V GZ devices can support data rates upto 12.5 Gbps on the x6 clock lines and 8 Gbps using PCIe or 9.8304 Gbps using Native PHY IP on the xN clock lines.

The transmitter clock network is comprised of x1 (x1 and x1_fPLL), x6 and xN clock lines.

Table 41.  Characteristics of x1, x6, and xN Clock Lines
Characteristics x1 x1_fPLL x6 x6_fPLL xN
Clock Source CMU PLL from CH 1 or CH 4 in a bank (serial clock only) fPLL adjacent to transceivers (serial clock only) Central clock divider from Ch 1 or Ch 4 in a bank (serial and parallel clock) fPLL through the x1_fPLL line. The central clock divider resource of Ch 1 or Ch 4 in a bank is used (serial and parallel clock). However, the Ch 1 or Ch 4 can still be used as the receiver CDR. x6 clock lines (serial and parallel clock)
Max Data Rate (Gbps) 10.3125 (GT and ST) 6.5536 (GX and SX) 3.125 6.5536 3.125 3.25 19
Clock Line Span Within a transceiver bank Within a group of 3 channels (0, 1, 2 or 3, 4, 5) Within a transceiver bank Within a transceiver bank Across all channels in the same side of device
Non-bonded Configuration Yes Yes Yes No Yes
Bonded Configuration No No Yes Yes Yes
Table 42.  Data Rates and Spans Supported by Clock Sources and Clock Networks in Arria V GZ Devices
Clock Network Transceiver Channel Clock Source Max Data Rate Bonding Span
x1 GX ATX PLLs in a transceiver bank 12.5 Gbps 20 No Transceiver bank
CMU PLLs in a transceiver bank 12.5 Gbps 20 Transceiver bank
Fractional PLLs in a transceiver bank 3.125 Gbps fPLLs can only span upper or lower 3 channels in a transceiver bank.
xN (Native PHY) GX ATX PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive only the serial clock from the x6 clock lines. 8 Gbps No xN lines span a side of the device. Specified datarate can drive up to 13 data channels above and up to 13 data channels below TX PLL.
Channel PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive only the serial clock from the x6 clock lines. 7.99 Gbps
Fractional PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive only the serial clock from the x6 clock lines. 3.125 Gbps
x6 GX ATX PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The x6 clock lines receive both the serial and parallel clock from the central clock dividers. 12.5 Gbps 20 Yes Transceiver bank
The channel (CMU) PLLs provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The x6 clock lines receive both the serial and parallel clock from the central clock dividers. 12.5 Gbps 20
Fractional PLLs provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The x6 clock lines receive both the serial and parallel clock from the central clock dividers. 3.125 Gbps
x6 PLL Feedback Compensation 21 GX One ATX PLL per bonded transceiver bank provides a serial clock to the central clock dividers of Ch 1 and Ch 4. The central clock dividers in the transceiver bank drive the x6 clock lines and provide feedback path to the ATX PLL. The x6 clock lines receive both the serial and parallel clocks from the central clock dividers. 12.5 Gbps 20 Yes x6 lines span a transceiver bank. The x6 lines across multiple transceiver banks can be bonded together through PLL feedback compensation path to span the entire side of the device.
One CMU PLL per bonded transceiver bank provides a serial clock to the central clock dividers of Ch 1 and Ch 4. The central clock dividers in the transceiver bank drive the x6 clock lines and provide feedback path to the CMU PLL. The x6 clock lines receive both the serial and parallel clocks from the central clock dividers. 12.5 Gbps 20
xN (PCIe) 22 GX The ATX or channel (CMU) PLL provides a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive the serial and parallel clocks from the x6 clock lines. 8 Gbps Yes xN lines span a side of the device, but can bond only up to eight contiguous data channels.
xN (Native PHY) GX ATX PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive the serial and parallel clocks from the x6 clock lines. 9.8304 Gbps Yes xN lines span a side of the device. Specified datarate can bond up to 7 contiguous data channels above and up to 7 contiguous data channels below TX PLL.
8 Gbps Yes xN lines span a side of the device. Specified datarate can bond up to 13 contiguous data channels above and up to 13 contiguous data channels below TX PL
Channel (CMU) PLLs in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive the serial and parallel clocks from the x6 clock lines. 7.99 Gbps Yes xN lines span a side of the device. Specified datarate can bond up to 13 contiguous data channels above and up to 13 contiguous data channels below TX PL
Fractional PLLs (fPLLs) in a transceiver bank provide a serial clock to the central clock dividers of Ch1 and Ch4. The central clock dividers in the transceiver bank drive the x6 clock lines. The xN clock lines receive the serial and parallel clocks from the x6 clock lines. 3.125 Gbps
Figure 48.  x1 Clock Line Architecture (up to 6.5536 Gbps)


The x1 clock lines are driven by serial clocks of CMU PLLs from channels 1 and 4. The serial clock in the x1 clock line is then distributed to the local and central clock dividers of every channel within a transceiver bank.

The x1_fPLL clock lines are driven by the serial clocks of the adjacent fPLL. The serial clock in the x1_fPLL clock lines, is then distributed to the local and central clock dividers of channels within a group of three channels (0, 1, 2 or 3, 4, 5).

Figure 49.  x1 Clock Line Architecture (more than 6.5536 Gbps)


For serial data rates beyond 6.5536 Gbps (10-Gbps channels only in GT and ST devices). The x1 clock lines are driven by the serial clocks of CMU PLLs from channels 1 and 4. The serial clock in the x1 clock line is then distributed to the local and central clock dividers of every channel within a transceiver bank.

Note: When you configure the channel PLL as a CMU PLL to drive the local clock divider, or the central clock divider of its own channel, you cannot use the channel PLL as a CDR. Without a CDR, you can use the channel only as a transmitter channel.
Figure 50. x1 Clock Line Architecture (up to 12.5 Gbps) for GZ Devices


Figure 51.  x6 and xN Clock Line Architecture


The x6 clock lines are driven by serial and parallel clocks from the central clock divider in channels 1 and 4. For channels within a bank, the serial and parallel clocks in the x6 clock line is then distributed to every channel within a transceiver bank.

The xN clock lines extend the clocking reach of the x6 clock line to all channels within the same side of the device. To reach a xN clock line, the clocks must be provided on the x6 clock line. The serial and parallel clocks in the x6 clock line is distributed to every channel within a transceiver bank. The serial and parallel clocks are distributed to other channels beyond the bank using the xN clock line.

In bonded configurations, serial and parallel clocks from the x6 or xN clock lines are received by the clock divider of every bonded channel and fed directly to the serializer. In a non-bonded configuration, the clock divider of every non-bonded channel receives the serial clock from the x6 or xN clock lines and generates the individual parallel clock to the serializer.

Note:
  • In a bonded configuration, bonded channels must be placed contiguously without leaving a gap between the channels, except when the gap channel is a CMU PLL.
  • xN bonded configuration is only supported by PIPE and Native PHY IP.
Related Information
19 Only for PCIe Gen2 configurations, xN clock lines can support a maximum data rate of 5 Gbps. There is no xN data rate limit check in the Quartus II software. The limit in the handbook is the golden reference.
20 For the fastest speed grade only. For the remaining speed grades, refer to the Arria V Device Datasheet .
21 The input reference clock frequency of the transmit PLL must be the same as the parallel clock frequency which clock the PCS bonded channels.
22 For more information about PCIe x8 configurations, refer to the Transceiver Configurations in Arria V GZ Devices chapter.
Level Two Title