cf的manual中对cd1，cd2
有这样的描述
-CD1, -CD2 O 26, 25 These Card Detect pins are connected to ground on the CompactFlash Card. Theyare used by the host to determine if the card is fully inserted into its socket.
cf卡工作在trueide mode时
做cf卡接口时用其中之一就行
These Card Detect pins are connected to ground on the CompactFlash Card.
这就是说把cd1（我们选择26）接地就行吗？
