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

ID 683486
Date 8/31/2021
Public
Document Table of Contents

4.1.1.2. Preamble Insertion

In the TX datapath the MAC prepends an eight-byte preamble to the client frame. If you turn on Enable link fault generation , this MAC module also incorporates the functions of the reconciliation sublayer (RS).

The source of the 7-byte preamble (including a Start byte) and 1-byte SFD depends on whether you turn on Enable preamble passthrough in the parameter editor.

Note that a single parameter in the Low Latency E-Tile 40G Ethernet parameter editor turns on both RX and TX preamble passthrough.

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