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

4.3.1.3. 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 counter 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 15. Timing Diagram Example for Case 1
Figure 16. Timing Diagram Example for Case 2
Figure 17. Timing Diagram Example for Case 3
23 No adjustment is required.
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