SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The eMMC/SD/SDIO host controller can be used in two modes: MMC and SD/SDIO. It has been designed to be the most transparent with the type of card.
The type of the card connected is differentiated by the software initialization procedure. Software identifies the type of card connected during software initialization. For each card type, there are corresponding commands. Some commands are not supported by all cards. For more information, see the Multimedia Card System Specification, SD Memory Card Specifications, and SDIO Card Specification, Part E1.
The purpose of the module is to transfer commands and data to whatever card is connected, respecting the protocol of the connected card.
Writes and reads to the card must respect the appropriate protocol of that card.