Patent ID: 7659746
Filing Date: 2010-02-09
Classification: G06F,Y02D

Abstract:
1. An integrated circuit comprising: a global supply bus; a local supply bus; domain circuitry that is coupled to the local supply bus, wherein a supply current flows between the local supply bus and the domain circuitry when the domain circuitry is powered; a first logic element having an input lead and an output lead; a second logic element having an input lead and an output lead, the input lead of the second logic element being coupled to the output lead of the first logic element; a first switch having a first terminal coupled to the local supply bus, a second terminal coupled to the global supply bus, and a control terminal coupled to the output lead of the first logic element; and a second switch having a first terminal coupled to the local supply bus, a second terminal coupled to the global supply bus, and a control terminal coupled to the output lead of the second logic element, wherein a second enable signal is propagated from the input lead of the first logic element, through the first logic element and onto the output lead of the first logic element, and through the second logic element and onto the output lead of the second logic element such that the first and second switches are made conductive thereby coupling the local supply bus to the global supply bus and thereby allowing the supply current to flow a third logic element having an input lead and an output lead; a third switch having a first terminal coupled to the local supply bus, a second terminal coupled to the global supply bus, and a control terminal coupled to the output lead of the third logic element; and a control circuit comprising an enable register, a first count register and a second count register, wherein the enable register generates a first enable signal and the second enable signals, the first enable signal propagating from the input lead of the third logic element and to the output lead of the third logic element.