ARM Architecture - Power Modes
An ARM-based device uses both Dynamic Voltage and Frequency Scaling (DVFS) and clock gating. Which combined effect best describes the power saving achieved?
An ARM-based device uses both Dynamic Voltage and Frequency Scaling (DVFS) and clock gating. Which combined effect best describes the power saving achieved?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand DVFS effect
DVFS lowers voltage and frequency to reduce power consumption during low demand.Step 2: Understand clock gating effect
Clock gating stops the clock signal to idle parts, preventing unnecessary switching and saving power.Step 3: Combine effects
Together, DVFS and clock gating reduce power by lowering voltage/frequency and stopping clock signals to unused units.Final Answer:
DVFS reduces voltage and frequency; clock gating stops clock to idle units, together lowering power use -> Option DQuick Check:
DVFS + clock gating = Lower power use [OK]
Quick Trick: Combine voltage/frequency scaling with clock stopping for best power saving [OK]
Common Mistakes:
- Thinking DVFS increases voltage
- Confusing clock gating with increasing clock speed
- Assuming disabling sleep modes saves power
Master "Power Modes" in ARM Architecture
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