One eMMC/SD/SDIO host controller can support one eMMC memory card, one SD memory card, or one SDIO card.
Other combinations (for example, two SD cards, one eMMC, and one SD card) are not supported through a single controller. The following is supported:
- The MMC1 instance supports 1- and 4-bit data transfers. (mainly used for connection with SD cards)
- The MMC2 instance supports 1-, 4-, and 8-bit data transfers. (mainly used for connection with eMMC cards)
- The MMC3 instance supports 1-, 4-, and 8-bit data transfers. (mainly used for connection with SDIO cards)
- The MMC4 instance supports 1- and 4-bit data transfers. (mainly used for connection with SDIO cards)