3.2.6.2 SDMMC0 Card Connector (J12)

A standard MMC/SD card connector, connected to SDMMC0, is mounted on the top side of the baseboard. The SDMMC0 communication is based on a 12-pin interface (clock, command, write protect, power switch and data (8)). A card detection switch is included.

The figure below illustrates the SDMMC0 interface implementation.

Figure 3-14. SDMMC0

Figure 3-15. Standard SD Socket J12 Location

The table below describes the pin assignment of SDMMC connector J12.

Table 3-5. Standard SD Socket J12 Pin Assignment
Pin No	Mnemonic	PIO	Signal Description
1	SDMMC0_DAT3_PA5	PA5	Data line
2	SDMMC0_CMD_PA1	PA1	Command/response line
3	GND	–	GND
4	VDDSDHC (3.3V or 1.8V)	–	Power line
5	SDMMC0_CK_PA0	PA0	Clock line
6	SDMMC0_CD_PA13	PA13	Card detect
7	SDMMC0_DAT0_PA2	PA2	Data line
8	SDMMC0_DAT1_PA3	PA3	Data line
9	SDMMC0_DAT2_PA4	PA4	Data line
10	SDMMC0_DAT4_PA6	PA6	Data line
11	SDMMC0_DAT5_PA7	PA7	Data line
12	SDMMC0_DAT6_PA8	PA8	Data line
13	SDMMC0_DAT7_PA9	PA9	Data line
14	SDMMC0_WP_PA12	PA12	Write protect signal
15	GND	–	GND
16	GND	–	GND

Table 3-6. SDMMC1 Power Command
PIO	Mnemonic	Signal Description
PA11	SDMMC0_VDDSEL	Select 3.3V or 1.8V