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

ID 683468
Date 8/30/2022
Public

A newer version of this document is available.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

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.