TXEN=dis, RXEN=dis
DMA Configuration.
| TXCNT | TX threshold for DMA transmission. |
| TXEN | TX DMA channel enable. 0 (dis): DMA is disabled 1 (en): DMA is enabled |
| RXCNT | RX threshold for DMA transmission. |
| RXEN | RX DMA channel enable. 0 (dis): DMA is disabled 1 (en): DMA is enabled |