Why are the read and write control lines in a DMA controller bidirectional? Under what condition and for what purpose are they used as inputs? Under what condition and for what purpose are they used as outputs?

Introductory Circuit Analysis (13th Edition)
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Why are the read and write control lines in a DMA controller bidirectional? Under what
condition and for what purpose are they used as inputs? Under what condition and for what
purpose are they used as outputs?

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