JESD204B Intel® FPGA IP User Guide

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ID 683442
Date 12/16/2024
Public
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 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 TX (Subclass 0) TX (Subclass 1) TX (Subclass 2) RX (Subclass 0) RX (Subclass 1) RX (Subclass 2) 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. SYSREF Guidelines 5.2. Constraining Incoming SYSREF Signal 5.3. Programmable RBD Offset 5.4. Programmable LMFC Offset 5.5. 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

4.3.5. 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. Once JESD204B link reset is deasserted and the next SYSREF pulse starts, 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. Once the JESD204B IP link reset is deasserted and the next SYSREF pulse starts, 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.

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