F-Tile Ethernet Intel® FPGA Hard IP User Guide

ID 683023
Date 10/04/2021
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents
Give Feedback

7.3.2. RX MAC Avalon ST Client Interface with Enabled Passthrough and RX CRC Forwarding

When you turn on Preamble Passthrough in the parameter editor, the IP cores with Ethernet Mode set to 100GE data rate presents the preamble received on the first eight bytes of the o_rx_data signal; specifically, o_rx_data[511:448]. The IP cores with Ethernet Mode set to 40GE or 50GE data rates present preamble received on the o_rx_preamble port with each packet, while the o_rx_startofpacket signal is high.

The IP cores with Ethernet Mode set to 10GE or 25GE data rates present the preamble data received on the first cycle, o_rx_data[63:0].

When you don't select the Remove CRC Bytes option in the Bytes to Remove from RX Frames parameter, the CRC bytes are equivalent to the last four bytes of data presented when the o_rx_endofpacket signal is high.