The MCI (Multimedia Card / Memory Card Interface) synchronous driver is used for a high level stack implementation, which supports the MultiMedia Card (MMC) Specification V4.3, the SD Memory Card Specification V2.0, and the SDIO V2.0 specification.
Initialize and deinitialize the driver and associated hardware
Device selection/de-selection
Send command on the selected slot
Data transfer: reading, writing
Multimedia Card / Memory Card Interface capable hardware