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:
Apr. 09, 2013
Filed:
May. 10, 2011
Michael L. Case, Pflugerville, TX (US);
Jason R. Baumgartner, Austin, TX (US);
Robert L. Kanzelman, Rochester, MN (US);
Hari Mony, Austin, TX (US);
Michael L. Case, Pflugerville, TX (US);
Jason R. Baumgartner, Austin, TX (US);
Robert L. Kanzelman, Rochester, MN (US);
Hari Mony, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A logic synthesis program, method and system for simplifying and/or reducing a logic design receives output from a logic simulator that uses symbolic values for stimulus and contains symbolic values in the logic simulator output. Relationships between the nodes dependent on symbolic values can be used to merge nodes or otherwise simplify the logic design. Behaviors such as oscillators, transient values, identical signals, dependent logical states and chicken-switch determined states that depend on the symbolic values can be detected in the simulation results and the netlist simplified using the results of the detection. The netlist can be simplified by inserting registers to represent nodes that assume a symbolic value or combination based on symbolic values either statically or after an initial transient. Oscillating nodes can be replaced with equivalent oscillator circuits, and nodes having values dependent on chicken-switch operation can be detected and replaced with registers initialized from the chicken-switch input states.