Low Latency 50G Ethernet Intel® FPGA IP Design Example User Guide: For Intel® Stratix® 10 Devices

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ID 683147
Date 12/14/2020
Public
Document Table of Contents
Document Table of Contents x
1. Quick Start Guide 2. Design Example Description 3. Document Revision History for the Low Latency 50G Ethernet Intel® FPGA IP Design Example User Guide
1. Quick Start Guide x
1.1. Directory Structure 1.2. Simulation Design Example Components 1.3. Hardware Design Example Components 1.4. Generating the Design 1.5. Simulating the Design Example Testbench 1.6. Compiling and Configuring the Design Example in Hardware 1.7. Testing the Hardware Design Example
2. Design Example Description x
2.1. Features 2.2. Design Example Behavior 2.3. Design Example Interface Signals 2.4. Design Example Registers
2.4. Design Example Registers x
2.4.1. Packet Generator Programming Sequence
1. Quick Start Guide
2. Design Example Description
3. Document Revision History for the Low Latency 50G Ethernet Intel® FPGA IP Design Example User Guide

2.3. Design Example Interface Signals

The Low Latency 50G Ethernet testbench is self-contained and does not require you to drive any input signals.

Table 4.   Low Latency 50G Ethernet Hardware Design Example Interface Signals
Signal Direction Comments
clk50 Input Drive at 50 MHz. The intent is to drive this input from a 50 MHz oscillator on the board.
clk_ref_r Input Drive at 644.53125 or 322.265625 MHz.
cpu_resetn Input Resets the IP core. Active low. Drives the global hard reset csr_reset_n to the IP core.
tx_serial[3:0] Output Transceiver PHY output serial data.
rx_serial[3:0] Input Transceiver PHY input serial data.
user_led[7:0] Output Status signals. Currently the design example drives all of these signals to a constant value of 0. The hardware design example connects these bits to drive LEDs on the target board. Individual bits reflect the following signal values and clock behavior:
  • [0]: Main reset signal to IP core
  • [1]: Divided version of clk_ref
  • [2]: Divided version of clk50
  • [3]: Divided version of 100 MHz status clock
  • [4]: tx_lanes_stable
  • [5]: rx_block_lock
  • [6]: rx_am_lock
  • [7]: rx_pcs_ready
Level Two Title