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Why does ARM architecture assign the lowest numerical value to FIQ in exception priority levels?

hard📝 Conceptual Q10 of 15
ARM Architecture - Exception and Interrupt Model
Why does ARM architecture assign the lowest numerical value to FIQ in exception priority levels?
ATo ensure FIQ is handled fastest for critical interrupts
BBecause FIQ is the least important interrupt
CTo allow software to ignore FIQ exceptions
DTo match legacy processor designs
Step-by-Step Solution
Solution:

  1. Step 1: Understand FIQ purpose

    FIQ is designed for fast, critical interrupt handling requiring minimal delay.

  2. Step 2: Reason priority assignment

    Assigning lowest number to FIQ ensures it preempts other exceptions and is handled fastest.

  3. Final Answer:

    To ensure FIQ is handled fastest for critical interrupts -> Option A

  4. Quick Check:

    Lowest number = highest priority for fast handling [OK]
Quick Trick: Lowest number means highest priority for fast interrupts [OK]
Common Mistakes:
  • Thinking FIQ is least important
  • Assuming FIQ can be ignored
  • Believing priority is for legacy reasons

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