ARM Architecture - Bus Architecture
A programmer notices that the DMA controller is not transferring data correctly. Which of the following is a likely cause?
A programmer notices that the DMA controller is not transferring data correctly. Which of the following is a likely cause?
medium📝 Analysis Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Identify DMA bus control issue
If the DMA controller does not get bus grant, it cannot transfer data, causing failure.Step 2: Evaluate other options
CPU cache being disabled or clock speed being too high do not directly block DMA; peripheral power off affects the device but not DMA bus control.Final Answer:
The DMA controller did not receive bus grant from the CPU -> Option CQuick Check:
DMA needs bus grant to transfer data [OK]
Quick Trick: DMA must get bus grant to transfer data [OK]
Common Mistakes:
- Blaming CPU speed for DMA failure
- Ignoring bus grant signals
- Assuming CPU cache affects DMA directly
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