Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP Design Example User Guide

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ID 683599
Date 10/05/2020
Public
Document Table of Contents
Document Table of Contents x
1. Quick Start Guide 2. Design Example Description 3. Low Latency 40G for ASIC Proto Ethernet Intel FPGA IP Design Example User Guide Archive 4. Document Revision History for Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP 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. Testing the Low Latency 40G for ASIC Proto 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. Ethernet Toolkit Overview 2.7. Low Latency 40G for ASIC Proto Ethernet Design Example Registers 2.8. Design Example Interface Signals
2.5. Hardware Testing x
2.5.1. Internal Loopback Test 2.5.2. External Loopback Test
2.6. Ethernet Toolkit Overview x
2.6.1. Features
1. Quick Start Guide
2. Design Example Description
3. Low Latency 40G for ASIC Proto Ethernet Intel FPGA IP Design Example User Guide Archive
4. Document Revision History for Low Latency 40G for ASIC Proto Ethernet Intel® FPGA IP Design Example User Guide

2.8. Design Example Interface Signals

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

Table 8.   Low Latency 40G for ASIC Proto Ethernet Hardware Design Example Interface Signals
Signal Direction Comments
clk50 Input

Drive at 50 MHz. The intent is to drive it from a 50 MHz oscillator on the 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 644.53125 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
Related Information
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