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【多选题】
有关总线周期的说法,以下正确的是( )?A.
CPU在与存储器或I/O端口交换数据时需要启动一个总线周期
B.
总线周期即为CPU完成一次访问内存（或接口）操作所需要的时间
C.
一个总线周期至少包括4个时钟周期
D.
按照数据的传送方向来分，总线周期可分为“读”总线周期和“写”总线周期
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