Patent ID: 6971074
Filing Date: 2005-11-29
Classification: G06F

Abstract:
1. A layout device comprising: a processing type setting part for classifying every area of a layout of a semiconductor integrated circuit in accordance with percentage voltage drop in the circuit, and for extracting a processing target portion composed of a group of areas, including an area having a percentage voltage drop exceeding a predetermined threshold; a layout generating part for applying layout processing to alleviate differences of the percentage voltage drops, among the areas, for circuit components included in the processing target portion; and a memory for storing, in accordance with the percentage voltage drop, an occupancy rate of dummy cells that act as a placement forbidden area of the circuit cells, wherein the layout generating part places, as layout change processing, the circuit cells after the dummy cells have placed at the occupancy rate read out from the memory in accordance with the percentage voltage drop of each area in the processing target portion.