25G Ethernet Intel® Stratix® 10 FPGA IP User Guide

ID 683154
Date 9/15/2021
Public
Document Table of Contents

4.1.4.4. RX CRC Checking and Dynamic Forwarding

The RX MAC checks the incoming CRC32 for errors. It asserts l1_rx_error[1] in the same cycle as l1_rx_endofpacket when it detects an error. CRC checking takes several cycles. The packet frame is delayed to align the CRC output with the end of the frame.

By default, the RX MAC strips off the CRC bytes before forwarding the packet to the MAC client. You can configure the core to retain the RX CRC and forward it to the client by updating the MAC_CRC_CONFIG register.

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