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问一下关于外接引脚的问题,求帮忙



 如图,这个电路是什么意思呢,为什么对15~12地址线强制拉高或拉低呢,对外接的sram和flash有什么影响呢(这四位地址线接了外扩ram和flash),cmd zone7是0x200000,flash是0x33ff80