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:
Oct. 29, 1991
Filed:
Mar. 15, 1989
Thomas J Schaefer, Cupertino, CA (US);
Robert D Shur, Los Altos, CA (US);
VLSI Technology, Inc., San Jose, CA (US);
Abstract
A simulator for a levelized logic circuit reduces the number of evaluations required. The simulator associates certain lists of signals, called fences, with each component of a logic circuit. A fence is evaluated to determine whether it is active or inactive. Active fences contain signals which have charged since a previous evaluation. Components for active fences are then evaluated by the simulator. Fences are formed by starting with a seed set of signals. If all of the input signals to a component are in one or more fences, a final fence for a component is formed which is the union of the one or more fences. Only signals which can cause an output change on a component are included in fences.