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In demand transfer mode of 8237, the device stops data transfer when

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in Microprocessor by (39.4k points)
In demand transfer mode of 8237, the device stops data transfer when

(a) a TC (terminal count) is reached

(b) an external EOP (active low) is detected

(c) the DREQ signal goes inactive

(d) all of the mentioned

This question was addressed to me in an interview.

My doubt stems from Programmable DMA Interface 8237 -2 in portion DMA, Floppy Disk and CRT Controllers of Microprocessor

1 Answer

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by (49.2k points)
Correct choice is (d) all of the mentioned

The best I can explain: In demand transfer mode, the device continues transfers till a TC is reached or an external EOP is detected or the DREQ signal goes inactive.

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