A standard MMC/SD card connector, connected to SDMMC0, is mounted on the bottom 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.
The figure below illustrates the implementation for the SDMMC0 interface.
Figure 1. SDMMC0 Interface and the Standard SD
Socket
The table below describes the pin assignment of SD/MMC connector J5.
| Function | Pin | Shared | Signal Description |
|---|---|---|---|
| PA5 | 1 | – | SDMMC0_DAT3_PA5 |
| PA1 | 2 | – | SDMMC0_CMD_PA1 |
| GND | 3 | – | Ground |
| VCC | 4 | – | VDDSDHC (3v3) |
| PA0 | 5 | – | SDMMC0_CK_PA0 |
| PA13 | 6 | – | SDMMC0_CD_PA13 (card detect) |
| PA2 | 7 | – | SDMMC0_DAT0_PA2 |
| PA3 | 8 | – | SDMMC0_DAT1_PA3 |
| PA4 | 9 | – | SDMMC0_DAT2_PA4 |
| PA13 | 10 | – | SDMMC0_CD_PA13 |
| PA12 | 11 | – | SDMMC0_WP_PA12 |
| GND | 12 | – | Ground |