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M3侧有EPI总线。S0~S7可以给到28X
你提到的32M和64M，一个是镜像，一个是Bit Banded的RAM他们针对上面的RAM。
做个试验，修改0X2000 0000 的内容，然后监视0X2200 0000 和0X2400 0000的内容
