Matrix arbitration register
| PRI_ICODE | I-Code bus priority. Should be lower than PRI_DCODE for proper operation. |
| PRI_DCODE | D-Code bus priority. |
| PRI_SYS | System bus priority. |
| PRI_GPDMA | General Purpose DMA controller priority. |
| PRI_ETH | Ethernet DMA priority. |
| PRI_LCD | LCD DMA priority. |
| PRI_USB | USB DMA priority. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |
| ROM_LAT | ROM latency select. Should always be 0. |
| RESERVED | Reserved. Read value is undefined, only zero should be written. |