Patent ID: 7307295

Claim:
A system comprising: a graphics chip; and an input/output controller hub, the input/output controller hub including an integrated circuit, wherein the integrated circuit comprises a plurality of metal layers; a logic circuit having a plurality of input terminals and an output terminal to output a hard-coded bit, wherein a value of the hard-coded bit is changeable during fabrication in any single one of the plurality of metal layers; and a plurality of cells, each of the plurality of cells being on a distinct one of the plurality of metal layers, each of the plurality of cells comprising an output pin coupled to one of the plurality of input terminals of the logic circuit, each of the plurality of cells further comprising a connector to electrically couple the output pin to one of a first via stack and a second via stack, wherein the first via stack and the second via stack are electrically coupled to a first supply voltage and a second supply voltage, respectively.