MAC2MAC support

Table of Contents

• Introduction
• Enable MAC2MAC through Sysconfig

Introduction

A MAC is connected to the network using a PHY, but when the objective is to connect to another MAC in a controlled environment such as a PCB, the PHY is often redundant. In such a situation, a PHY-less approach can be used where the RGMII Rx, Tx, and Clock pins are usually connected directly using buffers. This is called a MAC2MAC connection.

Enable MAC2MAC through Sysconfig

Note

MAC2MAC is not a comprehensively tested feature.

The following steps list the changes needed in Sysconfig to enable MAC2MAC mode.

• Configure the following option under Enet (CPSW) -> MAC Port Config -> MAC Port 1/2 Config
  • Set the "Link Speed Capability" to ENET_SPEED_1GBIT.
  • Set the "Link Duplexity Capability" to ENET_DUPLEX_FULL.
  • From Port PHY Configuration, set the "ETHPHY Device" to NO-PHY, this internally sets the PHY address to ENETPHY_INVALID_PHYADDR indicating that it is a PHY-less connection and Sysconfig will not generate any code for ETHPHY.