3.4.5 Secure Digital Multimedia Cards (SDMMC)

The SD (Secure Digital) cards are a non-volatile memory card format used as a mass storage memory in mobile devices.

The SAM9X60D1G has two Secure Digital Multimedia Card (SDMMC) interfaces that support the MultiMedia Card (e.MMC) Specification V4.51, the SD Memory Card Specification V3.0, and the SDIO V3.0 specification. They are compliant with the SD Host Controller Standard V3.0 Specification.

A standard SD card connector, connected to the SDMMC interface, is mounted on the top side of the board. The SDMMC1 communication is based on an 8-pin interface (clock, command, four data and power lines). It includes a card detection switch. In addition, this interface has a write protect pin. The main purpose of this connector is to accommodate radio modules, such as the ATWILC3000-SD Evaluation Kit (AC164158). Details are available on the Microchip web site.

A standard μSD card connector, connected to the SDMMC interface, is also mounted on the top side of the board. The SDMMC0 communication is based on an 8-pin interface (clock, command, four data and power lines). It includes a card detection switch. This connector gives access to the boot environment.