3.18.5 microSD Card (Secure Digital Multimedia Cards (SDMMC))
A standard microSD card connector, connected to the SDMMC interface, is also mounted on the top 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. This connector provides access to the boot environment.
The following figure shows the microSD card connector.
The following table shows the microSD card connector signal descriptions.
| Pin No | PIO | Signal Name | Signal Description |
|---|---|---|---|
| P1 | PA4 | SDMMC0_DAT2 | Data 2 |
| P2 | PA5 | SDMMC0_DAT3 | Data 3 |
| P3 | PA1 | SDMMC0_CMD | Card command |
| P4 | – | VDD_3V3_PW_SD | 3.3V |
| P5 | PA2 | SDMMC0_CK | Clock |
| P6, G5 | – | GND | GND |
| P7 | PA0 | SDMMC0_DAT0 | Data 0 |
| P8 | PA3 | SDMMC0_DAT1 | Data 1 |
| G4 | PA23 | SDMMC0_CD | Card detection |
| G1, G2, G3, G6 | – | – | Connected to GND |