It is necessary to transfer 256 words from a magnetic disk to a memory section starting from
Question:
It is necessary to transfer 256 words from a magnetic disk to a memory section starting from address 1230. The transfer is by means of DMA as shown in Fig. 11-18.
a. Give the initial values that the CPU must transfer to the DMA controller.
b. Give the step-by-step account of the actions taken during the input of the first two words.
Fig. 11-18
Transcribed Image Text:
Address select Interrupt BG BR RD RD DS RS BR BG Interrupt CPU WR Address Data WR Address Data: Direct memory access (DMA) controller RD Read control Write control Data bus Address bus Random-access memory (RAM) WR Address Data DMA acknowledge DMA request 1/0 Peripheral device
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A Initial values that the CPU must transfer to the DMA controller Address register 1230 Word count register 256 Control register Mode Write to memory ...View the full answer
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