Patent ID: 7890906
Filing Date: 2011-02-15
Classification: G06F

Abstract:
1. A method of forming an integrated circuit, said method comprising: providing a library of predefined cells with known polysilicon perimeter densities, said providing of said library comprising determining a polysilicon perimeter density for each predefined cell by dividing a sum of the perimeter of all polysilicon shapes in said predefined cell by the area of said cell; receiving a design for said integrated circuit; selecting, from said library, cells required to form said integrated circuit according to said design; and determining locations on a chip for said cells and placing said cells in said locations to form said integrated circuit, said determining of said locations and said placing of said cells in said locations being performed based at least in part on said known polysilicon perimeter densities in order to achieve one of approximately uniform across-chip polysilicon perimeter density and selectively controlled across-chip polysilicon perimeter density variations; said determining of said locations on said chip and said placing of said cells in said locations to achieve said approximately uniform across-chip polysilicon perimeter density comprising distributing cells having relatively high polysilicon perimeter densities approximately evenly across said chip.