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 |