Operation Mode Register
| SR | Start/Stop Receive |
| OSF | Operate on Second Frame |
| RTC | Receive Threshold Control |
| FUF | Forward Undersized Good Frames |
| FEF | Forward Error Frames |
| ST | Start/Stop Transmission Command |
| TTC | Transmit Threshold Control |
| FTF | Flush Transmit FIFO |
| TSF | Transmit Store Forward |
| DFF | Disable Flushing of Received Frames |
| RSF | Receive Store and Forward |
| DT | Disable Dropping of TCP/IP Checksum Error Frames |