Importance

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Abstract

A system which may be implemented on an integrated circuit including a global supply bus, a gated supply bus, a functional circuit receiving voltage from the gated supply bus, and a digital power gating system. The digital power gating system includes gating devices, a power gating control system, and a global control adjuster. The gating devices are coupled between the global and gated supply buses and are controlled by a digital control value. The power gating control system performs power gating by successively adjusting the digital control value to reduce a voltage of the gated supply bus to a state retention voltage level. The global control adjuster performs a global adjustment of the digital control value to increase the voltage of the gated supply bus to prevent it from falling below the state retention voltage level in response to an impending change of a voltage of the global supply bus.

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First Claim