8.2 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 SAM9X60D1G-I/LZB includes 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.
The two interfaces can be connected to a standard SD Card interface.
SDMMCx Card Connector
The board features two standard MMC/SD Card connectors, connected to SDMMC0 and SDMMC1. Both interface communications are based on a 4-pin interface (clock, command, four data and power lines).
| Interface Instance | IO Set | Pin No. | PIO | Pin Name | Description |
|---|---|---|---|---|---|
| SDMMC0 | 1 | 86 | PA17 | SDMMC0_CK | SD Card/e.MMC clock signal |
| 89 | PA16 | SDMMC0_CMD | SD Card/e.MMC command Line | ||
| 91 | PA15 | SDMMC0_DAT0 | SD Card/e.MMC data lines | ||
| 88 | PA18 | SDMMC0_DAT1 | |||
| 90 | PA19 | SDMMC0_DAT2 | |||
| 87 | PA20 | SDMMC0_DAT3 | |||
| SDMMC1 | 1 | 146 | PA13 | SDMMC1_CK | SD Card/e.MMC clock signal |
| 145 | PA12 | SDMMC1_CMD | SD Card/e.MMC command line | ||
| 144 | PA11 | SDMMC1_DAT0 | SD Card/e.MMC data lines | ||
| 81 | PA2 | SDMMC1_DAT1 | |||
| 82 | PA3 | SDMMC1_DAT2 | |||
| 83 | PA4 | SDMMC1_DAT3 |