4.6.1 Interfacing with an SD Card

The SD (Secure Digital) Card is a nonvolatile memory card format used as mass storage memory in mobile devices.

Secure Digital Multimedia Card (SDMMC) Controller

The ATSAMA5D27-WLSOM1 has one Secure Digital Multimedia Card (SDMMC) interface that supports the MultiMedia Card (e.MMC) Specification V4.41, 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.

The SDMMC0 interface can be connected to a standard SD card interface.

SDMMC0 Card Connector

The board features a standard MMC/SD card connector, connected to SDMMC0. The SDMMC0 communication is based on a 4- or 8-pin interface (clock, command, four or eight data and power lines). It may include a card detection switch.