Network control register
| LOOPBACKLOCAL | Loopback local | 
| ENBRX | Receive enable | 
| ENBTX | Transmit enable | 
| MANPORTEN | Management port enable | 
| CLRALLSTATSREGS | Clear statistics registers | 
| INCALLSTATSREGS | Incremental statistics registers | 
| STATSWREN | Write enable for statistics registers | 
| BACKPRESSURE | Back pressure will force collisions on all received frames | 
| TXSTRT | Start transmission | 
| TXHALT | Transmit halt | 
| TXPFRMREQ | Transmit pause frame | 
| TXPFRMZERO | Transmit zero quantum pause frame | 
| STORERXTS | Store receive time stamp to memory. | 
| PFCENB | Enable PFC Priority Based Pause Reception capabilities. | 
| TXPFCPRIORPFRM | Write a one to transmit PFC priority based pause frame. | 
| FLUSHRXPKT | Flush the next packet from the external RX DPRAM. | 
| TXLPIEN | Enable LPI transmission when set LPI (low power idle) is immediately transmitted. | 
| PTPUNICASTEN | Enable detection of unicast PTP unicast frames. | 
| STOREUDPOFFSET | Store UDP / TCP offset to memory. | 
| ONESTEPSYNCMODE | 1588 One Step Sync Mode. | 
| PFCCTRL | Enable multiple PFC pause quantums, one per pause priority |