Interrupt Status Register
| MODEMFAIL | Mode M Failure | 
| UNDERFLOWDET | Underflow Detected | 
| INDIRECTOPDONE | Indirect Operation Complete | 
| INDIRECTREADREJECT | Indirect Operation Was Requested but Could Not Be Accepted | 
| PROTWRATTEMPT | Write to Protected Area Was Attempted and Rejected | 
| ILLEGALACCESSDET | Illegal Memory Access Has Been Detected | 
| INDIRECTXFERLEVELBREACH | Indirect Transfer Watermark Level Breached | 
| RECVOVERFLOW | Receive Overflow | 
| TXFIFONOTFULL | Small TX FIFO Not Full | 
| TXFIFOFULL | Small TX FIFO Full | 
| RXFIFONOTEMPTY | Small RX FIFO Not Empty | 
| RXFIFOFULL | Small RX FIFO Full | 
| INDRDSRAMFULL | Indirect Read Partition Overflow | 
| POLLEXPINT | The Maximum Number of Programmed Polls Cycles is Expired | 
| STIGREQINT | The Controller is Ready for Getting Another STIG Request | 
| RXCRCDATAERR | RX CRC Data Error | 
| RXCRCDATAVAL | RX CRC Data Valid | 
| TXCRCCHUNKBRK | TX CRC Chunk Was Broken |