ARM Architecture - Bus Architecture
Consider this sequence: The DMA controller requests the bus, transfers 256 bytes from memory to a peripheral, then releases the bus. What is the main benefit of this process?
Consider this sequence: The DMA controller requests the bus, transfers 256 bytes from memory to a peripheral, then releases the bus. What is the main benefit of this process?
medium📝 Analysis Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze DMA operation effect on CPU
DMA transfers data directly, so CPU does not handle each byte and can work on other tasks.Step 2: Check other options for accuracy
Data transfer speed is slower due to bus arbitration is wrong because DMA speeds up transfer; CPU must wait until DMA finishes before continuing is false as CPU can work concurrently; Peripheral devices are disabled during transfer is incorrect since peripherals remain active.Final Answer:
CPU is free to perform other tasks during data transfer -> Option DQuick Check:
DMA frees CPU during transfer [OK]
Quick Trick: DMA frees CPU by handling data transfer itself [OK]
Common Mistakes:
- Thinking CPU must wait for DMA to finish
- Believing DMA slows down data transfer
- Assuming peripherals are disabled
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