Ethernet NIC debugging physical layer precautions

Project description

A common way to verify network interface communication is through a ping test. To test ping, you can use a previously verified upper-layer program. If ping fails, hardware issues need to be investigated. Most chips use an on-chip MAC (Machine Interface) and an off-chip PHY (Physical Interface). First, the PHY is configured via the MDIO interface; you read and write the PHY to perform the configuration. If this step is normal, check the data interface . The data interface is usually an RGMII, RMII, or similar interface. The voltage between the MAC and PHY needs to be matched. A transformer…