DMS=IDLE
Rx FIFO 1 Status
| F1FL | Rx FIFO 1 Fill Level  |  
| F1GI | Rx FIFO 1 Get Index  |  
| F1PI | Rx FIFO 1 Put Index  |  
| F1F | Rx FIFO 1 Full  |  
| RF1L | Rx FIFO 1 Message Lost  |  
| DMS | Debug Message Status 0 (IDLE): Idle state 1 (DBGA): Debug message A received 2 (DBGB): Debug message A/B received 3 (DBGC): Debug message A/B/C received, DMA request set  |