Ethernet DMA bus mode register
| SWR | Software reset |
| DA | DMA Arbitration |
| DSL | Descriptor skip length |
| PBL | Programmable burst length |
| PR | Priority ratio |
| FB | Fixed burst |
| RDP | Rx DMA PBL |
| USP | Use separate PBL |
| PBLx8 | PNLx8 mode |
| AAB | Address-aligned beats |