1.Check to see that no MDIO operation is in progress. Read until gem.net_status[man_done] = 1.
2.Write data to the PHY management register (gem.phy_management). This initiates the data shift operation over MDIO.
3.Wait for completion of operation. Read until gem.net_status[man_done] = 1.
4.Read data bits for a read operation.
The PHY register data is available in gem.phy_management [phy_write_read_data].