XSPIM control register
| MUXEN | Multiplexed mode enable This bit enables the multiplexing of the two XSPIs. |
| MODE | XSPI multiplexing mode |
| CSSEL_OVR_EN | Chip select selector override enable |
| CSSEL_OVR_O1 | Chip select selector override setting for XSPI1 |
| CSSEL_OVR_O2 | Chip select selector override setting for XSPI2 |
| REQ2ACK_TIME | REQ to ACK time In Multiplexed mode (MUXEN = 1), this field defines the time between two transactions. |