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In ARM architecture, which exception type generally has the highest priority?

easy📝 Conceptual Q1 of 15
ARM Architecture - Exception and Interrupt Model
In ARM architecture, which exception type generally has the highest priority?
ASVC (Supervisor Call)
BIRQ (Interrupt Request)
CUndefined Instruction
DFIQ (Fast Interrupt Request)
Step-by-Step Solution
Solution:

  1. Step 1: Understand ARM exception types

    FIQ is designed for fast interrupts and usually has the highest priority.

  2. Step 2: Compare priorities

    FIQ is prioritized above IRQ, SVC, and Undefined Instruction exceptions.

  3. Final Answer:

    FIQ (Fast Interrupt Request) -> Option D

  4. Quick Check:

    Highest priority exception = FIQ [OK]
Quick Trick: FIQ is always the fastest and highest priority interrupt [OK]
Common Mistakes:
  • Confusing IRQ with FIQ
  • Assuming SVC has highest priority
  • Mixing Undefined Instruction with interrupts

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