[Solved] Which of the following is the correct sequence for DMA operation on the bus? — Ans: Request bus -> Transfer data -> Release bus | ARM Architecture

ARM Architecture - Bus Architecture

Which of the following is the correct sequence for DMA operation on the bus?

ARequest bus -> Transfer data -> Release bus

BTransfer data -> Request bus -> Release bus

CRelease bus -> Request bus -> Transfer data

DTransfer data -> Release bus -> Request bus

Step-by-Step Solution

Solution:

Step 1: Understand DMA bus operation steps
The DMA controller first requests the bus, then transfers data, and finally releases the bus.
Step 2: Match the correct order
Request bus -> Transfer data -> Release bus correctly shows this sequence: Request bus -> Transfer data -> Release bus.
Final Answer:
Request bus -> Transfer data -> Release bus -> Option A
Quick Check:
DMA operation sequence = Request, Transfer, Release [OK]

Quick Trick: DMA must request bus before transferring data [OK]

Common Mistakes:

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