ARM Architecture - Bus Architecture
What is the expected system response when an ARM processor attempts to write to a read-only MPU region?
What is the expected system response when an ARM processor attempts to write to a read-only MPU region?
medium📝 Analysis Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand MPU permissions
MPU enforces access permissions; writing to read-only region violates permissions.Step 2: Identify fault type
Such violation triggers a bus fault exception.Step 3: Eliminate other options
Write cannot succeed silently; processor reset or MPU disable are not automatic responses.Final Answer:
A bus fault exception is generated -> Option BQuick Check:
Write to read-only MPU region causes bus fault [OK]
Quick Trick: Write to read-only MPU region triggers bus fault [OK]
Common Mistakes:
- Assuming write succeeds despite MPU settings
- Confusing bus fault with processor reset
- Believing MPU disables itself on violation
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