OLIMEX© 2015
AM3352-SOM user's manual
6.3.1 SD/MMC slot
The schematic related to the SD/MMC (microSD connector) is shown below.
SD/MMC slot is a microSD card slot connector, located on the bottom of the board.
This slot is typically used for booting the OS, due to the larger capacities of the microSD cards
(compared to SD or MMC cards). It is suggested to have an SD card with a proper Linux. It is
recommended to use class 10 (10MByte/sec) card for faster read/write operations, since lower class
cards (especially higher capacity ones) might slow down the whole system.
You can find the table with the pinout of the microSD connector on the next page.
SD/MMC connector
Pin # Connector signal name
Wire name (processor ball)
1 DAT2/RES
MMC0_DAT2 (F18)
2 CD/DAT3/CS
MMC0_DAT3 (F17)
3 CMD/DI
MMC0_CMD (G18)
4 VDD
SD_VCC (-POWER_CIRCUIT-)
5 CLK/SCLK
MMC0_CLKO (G17)
6 VSS
GND (-POWER_CIRCUIT-)
7 DAT0/DO
MMC0_DAT0 (G16)
8 DAT1/RES
MMC0_DAT1 (G15)
9 CARD DETECT(SYMBOL)
MMC0_SDCD# (C15)
13 GND
GND (-POWER_CIRCUIT-)
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