The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2001
Filed:
Oct. 20, 1998
Minakshisundaran Balasubramanian Anand, Yokohama, JP;
Hiroshi Ohtani, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
Wiring of a non-uniform density is laid out on a chip. Then, the chip is virtually divided into a plurality of sub chips. The wiring density of each sub chip is obtained to obtain the density distribution function of wiring. After that, an index indicative of variations in the density of wiring is obtained on the basis of the density distribution function, thereby determining whether or not the index falls within an allowable range. If the index is out of the allowable range, the density distribution function is repeatedly updated until the index falls within the allowable range. Dummy wiring is provided on a region obtained by subtracting a region corresponding to the initial density distribution function from a region corresponding to the last density distribution function.