MII Mgmt Indicators register.
| BUSY | When 1 is returned - indicates MII Mgmt is currently performing an MII Mgmt Read or Write cycle. |
| SCANNING | When 1 is returned - indicates a scan operation (continuous MII Mgmt Read cycles) is in progress. |
| NOTVALID | When 1 is returned - indicates MII Mgmt Read cycle has not completed and the Read Data is not yet valid. |
| MIILINKFAIL | When 1 is returned - indicates that an MII Mgmt link fail has occurred. |
| RESERVED | Unused |