JESD204C Intel® FPGA IP User Guide

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ID 683108
Date 6/26/2023
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Document Table of Contents
Document Table of Contents x
1. About the JESD204C Intel FPGA IP User Guide 2. Overview of the JESD204C Intel FPGA IP 3. Functional Description 4. Getting Started 5. Designing with the JESD204C Intel® FPGA IP 6. JESD204C Intel® FPGA IP Parameters 7. Interface Signals 8. Control and Status Registers 9. JESD204C Intel® FPGA IP User Guide Archives 10. Document Revision History for the JESD204C Intel® FPGA IP User Guide
2. Overview of the JESD204C Intel FPGA IP x
2.1. Release Information 2.2. Device Family Support 2.3. JESD204C Intel® FPGA IP Features 2.4. Presets 2.5. Performance and Resource Utilization
3. Functional Description x
3.1. Clocks 3.2. Local Extended Multiblock Clock 3.3. CRC Encoding/Decoding 3.4. Scrambler/Descrambler
3.1. Clocks x
3.1.1. Device Clock 3.1.2. Frame Clock and Link Clock
3.2. Local Extended Multiblock Clock x
3.2.1. LEMC Counter
4. Getting Started x
4.1. Installing and Licensing Intel® FPGA IP Cores 4.2. Intel® FPGA IP Evaluation Mode 4.3. IP Catalog and Parameter Editor 4.4. JESD204C IP Component Files 4.5. Creating a New Intel® Quartus® Prime Project 4.6. Parameterizing and Generating the IP 4.7. Compiling the JESD204C IP Design 4.8. Programming an FPGA Device
5. Designing with the JESD204C Intel® FPGA IP x
5.1. JESD204C TX and RX Reset Sequence 5.2. Configuration Phase 5.3. Link Reinitialization 5.4. SYSREF Sampling 5.5. Interrupt and Error Handling 5.6. Deterministic Latency
5.5. Interrupt and Error Handling x
5.5.1. Interrupt Configuration for TX and RX 5.5.2. Interrupt Top Half ISR Handler 5.5.3. Interrupt Bottom Half ISR Handler
7. Interface Signals x
7.1. Transmitter Signals 7.2. Receiver Signals
8. Control and Status Registers x
8.1. Transmitter Registers 8.2. Receiver Registers
1. About the JESD204C Intel FPGA IP User Guide
2. Overview of the JESD204C Intel FPGA IP
3. Functional Description
4. Getting Started
5. Designing with the JESD204C Intel® FPGA IP
6. JESD204C Intel® FPGA IP Parameters
7. Interface Signals
8. Control and Status Registers
9. JESD204C Intel® FPGA IP User Guide Archives
10. Document Revision History for the JESD204C Intel® FPGA IP User Guide

3.1.2. Frame Clock and Link Clock

The frame clock frequency always equals the link clock frequency times the frame clock frequency multiplier (FCLK_MULP):

Frame clock frequency = FCLK_MULP x Link clock frequency

You can set the frame clock frequency multiplier through the JESD204C IP parameter editor. The valid values for the multiplier are limited to 1, 2, and 4. Because of the fixed relationship between the link clock and the frame clock, the Avalon-ST data will not always be streaming.

To provide consistency across the design regardless of frame clock and sampling clock, the link clock is used as a timing reference.

The IOPLL core should provide both the frame clock and link clock from the same PLL as these two clocks are treated as synchronous in the design.

For JESD204 TX and RX IPs, j204c_txlclk_ctrl or j204c_rxlclk_ctrl provides the phase information of a link clock rising edge that aligned to a frame clock rising edge.

Similarly, j204c_txfclk_ctrl or j204c_rxfclk_ctrl provides the phase information of a frame clock rising edge that aligned to a link clock rising edge. This additional clock phase information handles the transfer between frame clock and link clock in a synchronous manner.

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