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

3.2.1. LEMC Counter

JESD204C IP maintains an LEMC counter that counts from 0 to (E*32)–1 and wraps around again.

In Subclass 0 system, the LEMC counter starts at the deassertion of the link reset signal, without waiting for SYSREF detection.

In Subclass 1 deterministic latency system, all transmitters and receivers receive a common SYSREF, and the LEMC counter resets within two link clock cycles. SYSREF must be the same for the converter devices, which are grouped and required to be synchronized together.

Maximum SYSREF frequency = data rate/(66x32xE).

Table 14.  Example of SYSREF Frequency CalculationIn this example, you can choose to perform one of the following options:
  • Provide two SYSREF and a device clock; in which the ADC groups share the device clock and the two SYSREF clock (1.42 MHz and 2.84 MHz).
  • Provide 1 SYSREF running at 1.4 MHz and a device clock for the two ADC groups and one DAC group because the SYSREF period in the DAC is in the multiplication of n integer.
Group Configuration SYSREF Frequency
ADC Group 1 (2 ADCs)
  • LMF = 222
  • E = 2
  • Data rate = 6,000 Mbps
(6,000 MHz/(66x32x2) = 1.42 MHz
ADC Group 2 (2 ADCs)
  • LMF = 811
  • E = 1
  • Data rate = 6,000 Mbps
(6,000 MHz/(66x32x1) = 2.84 MHz
DAC Group 3 (2 DACs)
  • LMF = 222
  • E = 1
  • Data rate = 3,000 Mbps
(3,000 MHz/(66x32x1) = 1.42 MHz
Note: 1.42 MHz is the common maximum SYSREF frequency. You can lower the frequency to 0.71 MHz and the design still works.
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