DIGITAL POWER GATING WITH CONTROLLED RESUME

摘要

An integrated circuit including a global supply bus, a gated supply bus, and a digital power gating system with controlled resume. The digital power gating system includes gating devices and a power gating control system. Each gating device has a pair of current terminals coupled between the global supply bus and the gated supply bus and each has a control terminal. The power gating control system controls a digital control value which controls activation of the gating devices. The power gating control system is configured to successively adjust the digital control value to increase a voltage of the gated supply bus from a reduced voltage level to a normal operating voltage level in response to a resume indication. The reduced voltage level may be a state retention level or full power gating. Successive adjustment may be with constant or adjusted gain using a constant clock or a dynamically adjusted clock.

主权项

1. An integrated circuit, comprising:
a global supply bus and a gated supply bus; and a digital power gating system with controlled resume, comprising:
a plurality of gating devices, each said gating device having a pair of current terminals coupled between said global supply bus and said gated supply bus and each having a control terminal;a power gating control system that controls a digital control value, wherein said digital control value comprises a plurality of bits in which each bit of said digital control value is provided to control at least one control terminal of said plurality of gating devices to control activation of a corresponding subset of said plurality of gating devices; andwherein said power gating control system is configured to successively adjust said digital control value to increase a voltage of said gated supply bus from a reduced voltage level to a normal operating voltage level in response to a resume indication.