[Solved] Why might a DMA transfer fail if the bus arbitration logic is faulty? — Ans: DMA controller never gains bus control | ARM Architecture

ARM Architecture - Bus Architecture

Why might a DMA transfer fail if the bus arbitration logic is faulty?

APeripheral devices reset

BCPU clock speed drops

CDMA controller never gains bus control

DMemory data is corrupted

Step-by-Step Solution

Solution:

Step 1: Understand bus arbitration role
Bus arbitration decides which device controls the bus at a time.
Step 2: Link arbitration fault to DMA failure
If arbitration fails, DMA controller cannot gain bus control, so transfer fails.
Final Answer:
DMA controller never gains bus control -> Option C
Quick Check:
Faulty arbitration = DMA no bus control [OK]

Quick Trick: Bus arbitration grants bus control to DMA [OK]

Common Mistakes:

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Why might a DMA transfer fail if the bus arbitration logic is faulty?