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6.2.2 SD/MMC slot
The schematic related to the SD/MMC1 (SD/MMC connector) is shown below:
The SD/MMC2 slot is located on the back of the PCB and works with the "larger" SD and MMC
cards. The connector was placed by a popular demand.
Note that by default this connector is not suitable for booting OS. Such support is possible but not
implemented in the official software releases.
Pin # Connector signal name
1 CD/DAT3/CS
2 CMD/DI
3 VSS1
4 VDD
5 CLK/SCLK
6 VSS2
7 DAT0/DO
8 DAT1/RES
9 DAT2/RES
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.
SD/MMC card connector
Wire name (processor pin)
SDC3-D3 (B16)
SDC3-CMD (A18)
-
-
SDC3-CLK (B18)
-
SDC1-D0 (A17)
SDC1-D1 (B17)
SDC1-D2 (A16)
Page 29 of 56
A20-OLinuXino-MICRO user's manual
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