A20-Cubieboard shares the same expansion port definition with A10-Cubieboard. Actually they share the same PCB.

You can download the complete file from here : http://pan.baidu.com/share/link?shareid=1391019704&uk=993795718

• http://linux-sunxi.org/Cubieboard/ExpansionPorts
• http://linux-sunxi.org/Fex_Guide
• http://dl.cubieboard.org/docs/A20_System_Configuration_V1.0.pdf (Chinese)