Low Latency 40-Gbps Ethernet IP Core User Guide

ID 683745
Date 3/08/2021
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2.8. IP Core Testbenches

Intel provides a testbench, a hardware design example, and a compilation-only design example with most variations of the LL 40GbE IP core. The testbench is available for simulation of your IP core, and the hardware design example can be run on hardware. You can run the testbench to observe the IP core behavior on the various interfaces in simulation.

Intel offers testbenches for all Avalon-ST client interface variations that generate their own TX MAC clock(Use external TX MAC PLL is turned off).

Currently, the IP core can generate a testbench and example project for variations that use an external TX MAC PLL, but these testbenches and example projects do not function correctly. Non-functional testbenches and example projects provide an example of the connections you must create in your design to ensure the LL 40GbE IP core functions correctly. However, you cannot simulate them nor run them in hardware.

To generate the testbench, in the LL 40GbE parameter editor, you must first set the parameter values for the IP core variation you intend to generate in your end product. If you do not set the parameter values for your DUT to match the parameter values in your end product, the testbench you generate does not exercise the IP core variation you intend. If your IP core variation does not meet the criteria for a testbench, the generation process does not create a testbench (with the exception of the non-functional testbench generated if an IP core requires an external TX MAC clock signal).

You can simulate the testbench that you generate with your IP core variation. The testbench illustrates packet traffic, in addition to providing information regarding the transceiver PHY. The 40GBASE-KR4 testbench exercises auto-negotiation and link training, in addition to generating and checking packet traffic.

The testbench demonstrates a basic test of the IP core. It is not intended to be a substitute for a full verification environment.