Patent ID: 7131074

Claim:
An electrical structure, comprising: a parent terrain denoted as V 0 ; voltage islands denoted as V 1 and V 2 , said voltage island V 1 nested within said parent terrain V 0 and said voltage island V 2 nested within said voltage island V 1 ; and a logic circuit voltage power supply connected to a logic circuit and an externally supplied state saving power supply connected to a logic state saving circuit, said logic circuit and said state saving circuit within either said voltage island V 1 or said voltage island V 2 ; wherein each voltage island of the N voltage islands includes an externally supplied VDDN power supply and a voltage shifting means, or said externally supplied VDDN power supply and a fencing means, or said externally supplied VDDN power supply, said voltage shifting means and said fencing means; and wherein each voltage island of the N voltage islands further includes one or more substructures selected from the group consisting of an internal voltage island VDDI power distribution network, state saving means, one or more switching elements coupled between said externally supplied VDDN power supply and said internal voltage island VDDI power distribution network, and one or more voltage buffering circuits.