To indicate the I/O device that its request for the DMA transfer has been honoured by the CPU, the DMA controller pulls
A. HLDA signal
B. HRQ signal
C. DACK (active low)
D. DACK (active high)
Answer:A
To indicate the I/O device that its request for the DMA transfer has been honoured by the CPU, the DMA controller pulls
A. HLDA signal B. HRQ signal C. DACK (active low) D. DACK (active high)
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 honoured by the CPU.