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In 8257, if each device connected to a channel is assigned to a fixed priority then it is said to be in

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In 8257, if each device connected to a channel is assigned to a fixed priority then it is said to be in

(a) rotating priority scheme

(b) fixed priority scheme

(c) rotating priority and fixed priority scheme

(d) none of the mentioned

I have been asked this question in an interview for internship.

Asked question is from DMA Transfers and Operations in division DMA, Floppy Disk and CRT Controllers of Microprocessor

1 Answer

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by (49.2k points)
Right answer is (b) fixed priority scheme

Explanation: In this scheme, the DRQ3 has the lowest priority followed by DRQ2 and DRQ1. The DRQ0 has the highest priority.

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