[Solved] A developer wrote this pseudo-code to reduce power but it does not work as expected:if (cpu_idle) { disable_power_gating(); }What is the likely error? | ARM Architecture

ARM Architecture - Power Modes

A developer wrote this pseudo-code to reduce power but it does not work as expected:

if (cpu_idle) {
  disable_power_gating();
}

What is the likely error?

AThey need to disable clock gating, not power gating

BThey should enable power gating, not disable it

CThey should increase CPU frequency instead

DThey should boost voltage to save power

Step-by-Step Solution

Solution:

Step 1: Understand power gating purpose
Power gating saves power by turning off power to idle parts of the CPU.
Step 2: Analyze the code logic
The code disables power gating when CPU is idle, which prevents power saving. It should enable power gating instead.
Final Answer:
They should enable power gating, not disable it -> Option B
Quick Check:
Power gating enabled = Power saved [OK]

Quick Trick: Enable power gating to save power when idle [OK]

Common Mistakes:

Master "Power Modes" in ARM Architecture

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