Low Latency 40- and 100-Gbps Ethernet MAC and PHY MegaCore Function User Guide

ID 683628
Date 12/28/2017
Public
Document Table of Contents

3.2.3. Low Latency 40-100GbE IP Core RX Datapath

The Low Latency 40-100GbE RX MAC receives Ethernet frames from the PHY and forwards the payload with relevant header bytes to the client after performing some MAC functions on header bytes.

Figure 21. Flow of Frame Through the MAC RX Without Preamble Pass-Through 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 (0–1500 bytes), and <s> is the number of pad bytes (0–46 bytes).
Figure 22. Flow of Frame Through the MAC RX With Preamble Pass-Through Turned On 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 (0–1500 bytes), and <s> is the number of pad bytes (0–46 bytes).

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