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:
Mar. 13, 1990
Filed:
Mar. 30, 1987
Mely C Chi, Murray Hill, NJ (US);
Bell Telephone Laboratories, Murray Hill, NJ (US);
Abstract
An integrated circuit, and a method for laying out and creating the integrated circuit, which contains large circuit blocks placed at any desired location on a chip, with the rest of the circuitry placed in the remaining non-rectangular area on the chip. The layout takes account of connections from within the circuit area to connection points external to the area. The procedure for the automatic layout proceeds in two steps. The first step is global partitioning and placement, and the second is detailed placement. The global partitioning performs the logical partitioning of the cells into clusters to be placed among and between the macro cells and the external terminals, with each cluster being eventually laid-out in a rectangular area. The second step involves the detailed placement of cells within the rectangular areas. Partitioning is accomplished by an iterative process, where at each iterative step the non-rectangular area is divided into two parts of approximately equal size. The circuitry to be placed in each of the divided areas is then partitioned in proportion to the size of the areas in accordance with known techniques, coupled with a novel terminal reassignment procedure.