SDIO status register (SDIO_STS)
| CMDFAIL | Command crc fail |
| DTFAIL | Data crc fail |
| CMDTIMEOUT | Command timeout |
| DTTIMEOUT | Data timeout |
| TXERRU | Tx under run error |
| RXERRO | Rx over run error |
| CMDRSPCMPL | Command response complete |
| CMDCMPL | Command sent |
| DTCMPL | Data sent |
| SBITERR | Start bit error |
| DTBLKCMPL | Data block sent |
| DOCMD | Command transfer in progress |
| DOTX | Data transmit in progress |
| DORX | Data receive in progress |
| TXBUFH | Tx buffer half empty |
| RXBUFH | Rx buffer half empty |
| TXBUFF | Tx buffer full |
| RXBUFF | Rx buffer full |
| TXBUFE | Tx buffer empty |
| RXBUFE | Rx buffer empty |
| TXBUF | Tx data vaild |
| RXBUF | Rx data vaild |
| IOIF | SD I/O interrupt |