Ethernet DMA operation mode register
| SSR | Start or stop receive |
| OSF | Operate on second frame |
| RTC | Receive threshold control |
| FUGF | Forward undersized good frames |
| FEF | Forward error frames |
| SSTC | Start of stop transmission command |
| TTC | Transmit threshold control |
| FTF | Flush transmit FIFO |
| TSF | Transmit store and forward |
| DFRF | Disable flushing of received frames |
| RSF | Receive store and forward |
| DT | Disable dropping of TCP/IP checksum error frames |