Interview Question - Bangalore

Assume a clock-gating scheme for turning off the clock in certain situations:

• 60% of the time, the main circuit has valid data
• the clock gating circuitry is 80% effective
• the clock gating circuitry has a capacitance equal to 15% of the main circuit
• the clock gating circuitry has an activity factor equal to 1.1 times that of the main circuit.

How much power will be saved (as a percentage of the original power) by this clock gating scheme?

Solution: 15.5%
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Difficulty: Medium