Low Latency E-Tile 40G Ethernet Intel® FPGA IP Design Example User Guide

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ID 683747
Date 6/22/2020
Public
Document Table of Contents
Document Table of Contents x
1. Quick Start Guide 2. Design Example Description A. Low Latency E-Tile 40G Ethernet Intel FPGA IP Archives 3. Document Revision History for Low Latency E-tile 40G Ethernet Design Example User Guide
1. Quick Start Guide x
1.1. Generating the Design Example 1.2. Directory Structure 1.3. Simulating the Design Example Testbench 1.4. Compiling and Configuring the Design Example in Hardware 1.5. Changing Target Device in Hardware Design Example 1.6. Testing the Low Latency E-Tile 40G Ethernet Intel® FPGA IP Design in Hardware
1.1. Generating the Design Example x
1.1.1. Design Example Parameters
2. Design Example Description x
2.1. Features 2.2. Hardware and Software Requirements 2.3. Functional Description 2.4. Simulation 2.5. Hardware Testing 2.6. Low Latency E-Tile 40G Ethernet Design Example Registers 2.7. Design Example Interface Signals
2.5. Hardware Testing x
2.5.1. Internal Loopback Test 2.5.2. External Loopback Test
1. Quick Start Guide
2. Design Example Description
A. Low Latency E-Tile 40G Ethernet Intel FPGA IP Archives
3. Document Revision History for Low Latency E-tile 40G Ethernet Design Example User Guide

2.7. Design Example Interface Signals

The Low Latency E-Tile 40G Ethernet testbench is self-contained and does not require you to drive any input signals.

Table 7.   Low Latency E-Tile 40G Ethernet Hardware Design Example Interface Signals
Signal Direction Comments
clk50 Input

This clock is driven by the board oscillator.

  • Drive at 50 MHz on Intel® Stratix® 10 board.
  • Drive at 100 MHz on Intel® Agilex™ board.

The hardware design example routes this clock to the input of an IOPLL on the device and configures the IOPLL to drive a 100 MHz clock internally.

clk_ref Input Drive at 156.25 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. 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
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