Patent ID: 7370304

Claim:
An LSI designing system comprising: a memory; a database configured to store a layout layer definition file; and a control section configured to refer to said database to build up a plurality of layout layers in said memory based on said layout layer definition file, wherein said plurality of layout layers are provided for extending directions of patterns in one of physical layers of an LSI to be formed, and said control section divides each of said patterns into pattern structures based on said extending directions, and assigns each of said pattern structures to a corresponding one of said plurality of layout layers, wherein said control section carries out the building up of said plurality of layout layers over all of the physical layers of the LSI to be formed, and the assignment of each of said pattern structures to a corresponding layout layer, and wherein said database further stores a design rule file, said control section refers to said design rule file to check whether each of said plurality of layout layers meets design rules defined in said design rule file.