ARM Architecture - Bus Architecture
In a priority-based bus arbitration with devices D1 > D2 > D3 > D4, if D4 currently holds the bus and D2 requests access, which device will be granted the bus after D4 releases it?
In a priority-based bus arbitration with devices D1 > D2 > D3 > D4, if D4 currently holds the bus and D2 requests access, which device will be granted the bus after D4 releases it?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand priority arbitration
Devices with higher priority get bus access before lower priority devices.Step 2: Analyze the scenario
D4 currently has the bus; D2 requests access while D4 is using it.Step 3: Determine next bus owner
After D4 releases the bus, the highest priority requester (D2) will be granted access.Final Answer:
D2 -> Option DQuick Check:
Higher priority requests supersede lower ones. [OK]
Quick Trick: Highest priority requester gets bus next [OK]
Common Mistakes:
- Assuming current owner keeps bus after release
- Ignoring priority order
- Selecting device with no request
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