SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The PHY can be put into Isolate mode by writing ISOLATE bit of the Ethernet PHY Basic Mode Control - MR0 (EPHYBMCR) register, address 0x000. When in the Isolate mode, the PHY does not respond to packet data present at the internal interface to the Ethernet MAC. When in isolate mode, the PHY continues to respond to all management transactions and the PMD output pair does not transmit packet data, but continues to source 100Base-TX scrambled idles or 10Base-T normal link pulses. The PHY can auto-negotiate or parallel detect on the receive signal at the PMD input pair. A valid link can be established for the receiver even when the PHY is in Isolate mode.