E-tile Hard IP User Guide: E-Tile Hard IP for Ethernet and E-Tile CPRI PHY Intel® FPGA IPs

ID 683468
Date 9/26/2022
Public
Document Table of Contents

2.9.1.1.1. TX Preamble, Start, and SFD Insertion

In the TX datapath the MAC appends an eight-byte preamble that begins with a Start byte (0xFB) to the client frame.

The source of the preamble depends on whether you enable the preamble pass-through feature by turning on Enable preamble passthrough in the E-Tile Hard IP for Ethernet Intel FPGA IP parameter editor.

If the preamble pass-through feature is turned on, the client must provide 8 preamble bytes (including an SFD byte) on the data bus. The MAC will automatically replace the Start Control byte.

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