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 NoMnemonicPIOSignal Description
1SDMMC0_DAT3_PA5PA5Data line
2SDMMC0_CMD_PA1PA1Command/response line
3GND–GND
4VDDSDHC (3.3V or 1.8V)–Power line
5SDMMC0_CK_PA0PA0Clock line
6SDMMC0_CD_PA13PA13Card detect
7SDMMC0_DAT0_PA2PA2Data line
8SDMMC0_DAT1_PA3PA3Data line
9SDMMC0_DAT2_PA4PA4Data line
10SDMMC0_DAT4_PA6PA6Data line
11SDMMC0_DAT5_PA7PA7Data line
12SDMMC0_DAT6_PA8PA8Data line
13SDMMC0_DAT7_PA9PA9Data line
14SDMMC0_WP_PA12PA12Write protect signal
15GND–GND
16GND–GND
Table 3-6. SDMMC1 Power Command
PIOMnemonicSignal Description
PA11SDMMC0_VDDSELSelect 3.3V or 1.8V