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Consider a chip where clock gating is applied to a module during idle state. What is the expected effect?

medium📝 Analysis Q13 of 15
ARM Architecture - Power Modes
Consider a chip where clock gating is applied to a module during idle state. What is the expected effect?
AThe module's clock signal is stopped, reducing power use
BThe module continues running at full power
CThe module's clock speed increases to finish tasks faster
DThe module resets and loses its data
Step-by-Step Solution
Solution:

  1. Step 1: Understand clock gating during idle

    When a module is idle, clock gating stops its clock signal to save power.

  2. Step 2: Identify the effect on power and operation

    Stopping the clock reduces power consumption without resetting or speeding up the module.

  3. Final Answer:

    The module's clock signal is stopped, reducing power use -> Option A

  4. Quick Check:

    Idle module + clock gating = clock stopped, power saved [OK]
Quick Trick: Idle module clock stops, power drops [OK]
Common Mistakes:
  • Assuming module runs at full power when idle
  • Thinking clock speed increases during idle
  • Believing clock gating resets module data

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