By default, the
onboard MSP430™ is connected to both PHYs for MDC/MDIO
communication.
To use an external
MDC/MDIO connection, remove R81 and R82, then connect MDC,
MDIO, and GND to J2.
Note that J2 is not populated by default. Install
a 3-pin header here for easy external connections,
or solder external connections directly to J2
pads.