题目内容

DMAC与其他部件的关系如下图所示。
其中，DMAC的4条信号线(按①、②、③、④顺序)的名称分别是

A. DREQ、DACK、HPQ、HLDA
B. DREQ、HRQ、HLDA、DACK
C. HRQ、DREQ、DACK、HLDA
DREQ、HLDA、DACK、HRQ

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