OP=00
MII Management Frame Register
| DATA | Management frame data |
| TA | Turn around |
| RA | Register address |
| PA | PHY address |
| OP | Operation code 0 (00): Write frame operation, but not MII compliant. 1 (01): Write frame operation for a valid MII management frame. 2 (10): Read frame operation for a valid MII management frame. 3 (11): Read frame operation, but not MII compliant. |
| ST | Start of frame delimiter |