ARM Architecture - Bus Architecture
A system uses nested MPU regions with overlapping addresses. Which region's permissions apply during access?
A system uses nested MPU regions with overlapping addresses. Which region's permissions apply during access?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand MPU region priority
MPU regions have priorities based on their region number; lower numbers have higher priority.Step 2: Determine which region applies
When regions overlap, the highest priority region's permissions are enforced.Final Answer:
The region with the highest priority (lowest region number) -> Option DQuick Check:
Overlapping regions = Highest priority applies [OK]
Quick Trick: Lower region number means higher priority in MPU [OK]
Common Mistakes:
- Choosing largest size region
- Assuming last configured region applies
- Thinking lowest priority region applies
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