Low-power design strategies in ARM Architecture - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the main goal of low-power design strategies in ARM architecture?

The main goal is to reduce energy consumption while maintaining performance, extending battery life in devices and reducing heat generation.

intermediate

Explain Dynamic Voltage and Frequency Scaling (DVFS).

DVFS adjusts the processor's voltage and frequency based on workload demand, lowering power use during less intensive tasks.

intermediate

What is clock gating and how does it save power?

Clock gating stops the clock signal to parts of a processor when they are not in use, reducing switching activity and saving power.

advanced

Why is power gating used in low-power design?

Power gating completely shuts off power to idle blocks of a chip, eliminating leakage current and saving energy.

advanced

How does using multiple power domains help in low-power design?

Multiple power domains allow different parts of a chip to be powered independently, so unused sections can be turned off to save power.

Which technique reduces power by adjusting voltage and frequency based on workload?

A Clock Gating

B Dynamic Voltage and Frequency Scaling (DVFS)

C Power Gating

D Multiple Power Domains

DVFS changes voltage and frequency dynamically to save power during low workload.

What does clock gating do to save power?

A Turns off power to unused blocks

B Separates power domains

C Reduces voltage supply

D Stops clock signals to inactive parts

Clock gating stops the clock signal to parts not in use, reducing switching activity and power.

Power gating primarily helps by:

A Eliminating leakage current

B Lowering frequency

C Reducing switching power

D Increasing clock speed

Power gating cuts power to idle blocks, eliminating leakage current and saving energy.

Using multiple power domains allows:

A Independent power control of chip sections

B Faster clock speeds

C All parts to run at full power

D Higher voltage supply

Multiple power domains let different chip parts be powered on or off independently to save power.

Which of these is NOT a low-power design strategy?

A Dynamic Voltage and Frequency Scaling

B Clock Gating

C Increasing clock frequency constantly

D Power Gating

Constantly increasing clock frequency increases power use and is not a low-power strategy.

Describe three common low-power design strategies used in ARM processors and how they help save energy.

Think about how voltage, clock signals, and power supply can be controlled to reduce power.

Explain the role of multiple power domains in low-power chip design and why they are beneficial.

Consider how dividing a chip into parts helps manage power better.