67.24 SDMMC Timings

The Secure Digital Multimedia Card (SDMMC) Controller supports the embedded MultiMedia Card (e.MMC) Specification V4.51, the SD Memory Card Specification V3.0, and the SDIO V3.0 specification. It is compliant with the SD Host Controller Standard V3.0 specification.

Features are different for the two instances of SDMMC:

SDMMC0: SD 3.0, eMMC 4.51, 8 bits

SDMMC1: SD 2.0, eMMC 4.41, 4 bits only

In SDR104 mode (SD 3.0), SDMMC0 is limited to 120 MHz (instead of 208 MHz). In HS200 mode (eMMC 4.51), SDMMC0 is limited to 120 MHz (instead of 200 MHz).