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6657的UPP接口问题



6657的UPP与EMIF引脚复用,项目中我们是这样规划的,上电之后先设置为EMIF口,用于连接FLASH,加载程序,之后再设置为UPP接口,连接FPGA。
请问可不可以这样动态切换?如果可以,切换要多长时间?还有,UPP能不能切换回EMIF?