Ethernet MAC configuration register
| RE | Receiver enable |
| TE | Transmitter enable |
| DC | Deferral check |
| BL | Back-off limit |
| ACS | Automatic pad/CRC stripping |
| DR | Disable retry |
| IPC | IPv4 checksum offload |
| DM | Duplex mode |
| LM | Loopback mode |
| DRO | Disable receive own |
| FES | Fast EMAC speed |
| DCS | Disable carrier sense |
| IFG | Interframe gap |
| JD | Jabber disable |
| WD | Watchdog disable |