To indicate the I/O device that its request for the DMA transfer has been honored by the CPU, the DMA controller pulls

Electronics and Communication Engineering (ECE) : Microprocessors - Quiz(MCQ)

HRQ signal

DACK (active low)

HLDA signal

DACK (active high)

Correct Answer : Option (B) : DACK (active low)

Explanation : The DACK (active low) line of the used channel is pulled down by the DMA controller to indicate the I/O device that its request for the DMA transfer has been honored by the CPU.

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