Allwinner A20 User Manual download pdf (Page 24)

SD/MMC card connector

Pin # Connector signal name Wire name (processor pin)

1 CD/DAT3/CS SDC3-D3 (B16)

2 CMD/DI SDC3-CMD (A18)

3 VSS1 -

4 VDD -

5 CLK/SCLK SDC3-CLK (B18)

6 VSS2 -

7 DAT0/DO SDC1-D0 (A17)

8 DAT1/RES SDC1-D1 (B17)

9 DAT2/RES SDC1-D2 (A16)

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.

6.3 PWR jack

The power jack used is the typical 2.5mm one used by Olimex in most of our products. You should

provide 6 to 16 volts direct current and the required current may vary depending on the peripherals

connected to the board. The power supply you use should be capable of providing at least 500mA of

current.

Pin # Signal name

1 Power input

2 GND

More info about the power supply can be found in chapter 5 of this manual.

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Allwinner A20 User Manual Page 24