10.3 Interfacing with an SDIO/SD/MMC Device

The SAMA7G54 SOM Series includes two Secure Digital Multimedia Card (SDMMC) interfaces that support the SDIO V3.0 specification, the SD Memory Card V3.0 specification and the MultiMedia Card (e.MMC) V5.1 specification. They are compliant with the SD Host Controller Standard V3.0 specification.

The two interfaces can be connected to a standard SD card, e.MMC Flash or SDIO device.

The SAMA7G54 SOM Series features one 8-bit SDMMC interface on SDMMC0 and one 4-bit SDMMC interface on SDMMC1. Both interface communications are based on a clock, command, reset, card detect, bus data and power selection.

Table 10-36. SDMMCx Interface Configurations
Interface InstanceIO SetPin No.Pin NameFunction
SDMMC01125PA0SDMMC0 Clock Line
130PA1SDMMC0 Command Line
126PA2SDMMC0 Reset Signal
128PA3SDMMC0 Data 0 Line
121PA4SDMMC0 Data 1 Line
127PA5SDMMC0 Data 2 Line
124PA6SDMMC0 Data 3 Line
123PA7SDMMC0 Data 4 Line
122PA8SDMMC0 Data 5 Line
119PA9SDMMC0 Data 6 Line
120PA10SDMMC0 Data 7 Line
129PA11SDMMC0 Data Strobe Line
131PA12SDMMC0 Write Protect Signal
132PA13SDMMC0 1.8V/3.3V Selection
133PA14SDMMC0 Card Detect
SDMMC1152PB28SDMMC1 Reset Signal
53PB29SDMMC1 Command Line
58PB30SDMMC1 Clock Line
54PB31SDMMC1 Data 0 Line
55PC0SDMMC1 Data 1 Line
56PC1SDMMC1 Data 2 Line
57PC2SDMMC1 Data 3 Line
59PC3SDMMC1 Write Protect Signal
60PC4SDMMC1 Card Detect
61PC5SDMMC1 1.8V/3.3V Selection