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epi general-purpose mode模式下 地址映射问题



手册上有 0xc0000000 0xa0000000 两个初始地址, 我在选择不同地址时, 对于外部设备 数据线地址线 有什么不一样 ,如果一样为什么要用两组地址,如果不一样差别在哪。