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 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

4.1.1.2. 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
MSB 6 5 4 3 2 1 LSB
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 Arria® 10, 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.
Level Two Title