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Assertion: clock gating removes the leakage of a block. Reason: no transitions occur in a gated block.

  • A.both the assertion and the reason are true and the reason explains the assertion
  • B.both the assertion and the reason are true but the reason does not explain the assertion
  • C.the assertion is true but the reason given for it is false
  • D.the assertion is false although the reason offered is a true statement in itself

Answer: D

Gating the clock stops the switching and therefore the dynamic power, exactly as the reason says, but the transistors are still powered and still leak. Removing the leakage needs the supply to be cut, which is power gating.

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