ARM Architecture - Bus Architecture
In a system with multiple peripherals and a DMA controller on the bus, how can bus conflicts be avoided during simultaneous data transfer requests?
In a system with multiple peripherals and a DMA controller on the bus, how can bus conflicts be avoided during simultaneous data transfer requests?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand bus arbitration in multi-device systems
A bus arbiter manages access, ensuring only one device controls the bus at a time to prevent conflicts.Step 2: Analyze other options for feasibility
Allowing all devices to transfer data simultaneously would cause collisions; disabling the CPU during all peripheral transfers is inefficient; using interrupts to stop DMA transfers does not prevent bus conflicts.Final Answer:
Using a bus arbiter to grant bus access to one device at a time -> Option BQuick Check:
Bus arbiter prevents conflicts by granting access [OK]
Quick Trick: Bus arbiter controls access to avoid conflicts [OK]
Common Mistakes:
- Thinking multiple devices can use bus simultaneously
- Assuming CPU must be disabled
- Confusing interrupts with bus arbitration
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