F-Tile Ethernet Intel® FPGA Hard IP User Guide

ID 683023
Date 12/04/2023
Public
Document Table of Contents

4.2.2. MAC RX Datapath

The below sections are applicable for both, RX MAC Avalon ST interface and RX MAC segmented interface.

When the RX MAC in the channel is enabled, it receives Ethernet frames from the PHY and forwards them to the client with framing information together with the results of header and error checking functions.

You can configure whether to include or remove the PAD bytes and FCS using the Bytes to remove from RX frames parameter.

Figure 9. Flow of Frame Through the MAC Avalon ST RX Without Preamble Pass-ThroughThe figure illustrates the typical flow of frame through the MAC RX when the preamble pass-through feature is turned off. In this figure, <p> is payload size, and <s> is the number of pad bytes (0–46 bytes).
Figure 10. Flow of Frame Through the MAC Avalon ST RX With Preamble Pass-ThroughThe figure illustrates the typical flow of frame through the MAC RX when the preamble pass-through feature is turned on. In this figure, <p> is payload size, and <s> is the number of pad bytes (0–46 bytes)..

The following sections describe the functions performed by the RX MAC: