MDIO Data Register
GD | RMII Data This field contains the 16-bit data value read from the PHY after a Management Read operation or the 16-bit data value to be written to the PHY before a Management Write operation. |
RA | Register Address This field is valid only when the ETH_MAC_MDIO_ADDRESS[C45E] bit is set. It contains the Register Address in the PHY to which the MDIO frame is intended for. |