Patent ID: 6099582
Filing Date: 2000-08-08
Classification: G06F

Abstract:
A method of changing layout of a semiconductor device, comprising the steps of:a) preparing a physical layout representative of a layout of circuit constituents of a semiconductor device to be realized with use of a Levenson type phase shift mask;b) detecting a contradictory area in the layout not conforming with predetermined design rules, said rules including rules for a same phase and rules for a reverse phase;c) converting the physical layout into a graphical representation including:c-1) detecting nodes and branches interconnecting the detected nodes from the physical layout, where each node represents a circuit element, a contact outside of the circuit element, a branching point of a wiring layer, or a terminal point of a wiring layer;c-2) converting the nodes and the branches into the graphical representation;d) solving the contradictory area in the graphical representation; ande) converting the graphical representation into a new physical representation.