User manual

6.2.1 SD/MMC1 slot

The schematic related to the SD/MMC (microSD connector) is located on the top of the board and

the schematic shown below:

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/Android

image especially if you have ordered a version of the board without NAND memory. It is also

recommended to use Class 10 (10MByte/sec) card for faster read/write operations, lower class cards

(especially higher capacity ones) might slow down the whole system.

SD/MMC connector

Pin # Connector signal name Wire name (processor pin)

1 DAT2/RES SD0-D2 (K19)

2 CD/DAT3/CS SD0-D3 (K20)

3 CMD/DI SD0-CMD (L19)

4 VDD -POWER CIRCUIT-

5 CLK/SCLK SD0-CLK(L20)

6 VSS2 -POWER CIRCUIT-

7 DAT0/DO SD0-D0(M19)

8 DAT1/RES SD0-D1(M20)

Additionally, there are the WP and CP switches that are responsible, respectively, for sensing

whether the card is locked for reading and whether there is a card inserted.

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