Interrupt Status Register
| MFD | Management Frame Done |
| RCOMP | Receive Complete |
| RXUBR | Receive Used Bit Read |
| TXUBR | Transmit Used Bit Read |
| TUND | Ethernet Transmit Buffer Underrun |
| RLEX | Retry Limit Exceeded |
| TXERR | Transmit Error |
| TCOMP | Transmit Complete |
| ROVR | Receive Overrun |
| HRESP | Hresp not OK |
| PFRE | Pause Frame Received |
| PTZ | Pause Time Zero |