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AM3354 GPMC接口和nand flash问题

Other Parts Discussed in Thread: AM3354

参照AM3354 evm做的板卡,通过GPMC接口与FPGA通信(16位),采用SD卡启动。但是由于SD卡不牢靠,无法通过振动试验,想换成nand启动,但是nand也是通过GPMC引脚连接,两者可以同时使用吗?

目前已经验证,GPMC和EMMC两者可以同时使用,但是GPMC接口的速率会减半,不知道nand和GPMC可以同时使用吗?请解释一下EMMC和GPMC共存的原理,小弟不太清楚,想请教下!