Method and design system for semiconductor integrated circuit

A design system for a semiconductor integrated circuit, comprising:

• a storage device in which a layout data indicating a wiring pattern and a special pattern is stored;
• a first computer;
• and
• a plurality of second computers,
• wherein a minimum pitch specified for said wiring pattern by a design rule is a first wiring pitch and a minimum pitch specified for said special pattern by said design rule is a second wiring pitch larger than said first wiring pitch;
• said first computer reads said layout data from said storage device and divides a layout region in which said wiring pattern and said special pattern are placed into a plurality of division regions;
• said first computer extracts, with respect to each of said plurality of division regions, said special pattern included in a region that surrounds said each division region and has a predetermined width, said extracted special pattern being a peripheral pattern;
• said first computer determines, with respect to said each division region, a dummy pattern placement region included in said each division region, said dummy pattern placement region being apart from at least one of boundaries between said each division region and adjacent division regions;
• said first computer generates, with respect to said each division region, a division region data indicating layout of said each division region, said dummy pattern placement region and said peripheral pattern;
• said plurality of second computers execute dummy pattern placement processing with respect to said plurality of division regions in a distributed manner, wherein in said dummy pattern placement processing, each of said plurality of second computers receives said division region data of the corresponding division region and adds a dummy pattern in said dummy pattern placement region with avoiding a design rule error with said peripheral pattern;
• and
• said first computer receives said plurality of division region data to which said dummy pattern is added and couples said plurality of division regions with each other.