ARM Architecture - Power Modes
Why is clock gating considered more efficient than simply lowering the clock frequency for power saving in ARM processors?
Why is clock gating considered more efficient than simply lowering the clock frequency for power saving in ARM processors?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Compare clock gating and frequency scaling
Lowering frequency reduces switching power everywhere but does not stop it.Step 2: Understand clock gating effect
Clock gating stops clock to idle blocks, eliminating switching power in those blocks completely.Step 3: Identify efficiency reason
Stopping clock to idle blocks saves more power than just slowing the clock.Final Answer:
Because clock gating stops clock to idle blocks completely, eliminating switching power there -> Option DQuick Check:
Clock gating stops clock; frequency scaling slows clock [OK]
Quick Trick: Clock gating stops clock; frequency scaling only slows it [OK]
Common Mistakes:
- Thinking lowering frequency increases leakage
- Assuming clock gating increases voltage
- Believing lowering frequency disables whole processor
Master "Power Modes" in ARM Architecture
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