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:
Sep. 15, 2015
Filed:
Mar. 21, 2014
Mentor Graphics Corporation, Wilsonville, OR (US);
Stephen Kenneth Sunter, Nepean, CA;
Mentor Graphics Corporation, Wilsonville, OR (US);
Abstract
Various aspects of the present invention relate to techniques of measuring delays between edges of signals of a circuit. Alternating signals, synchronous to a first clock, are supplied to a plurality of nodes of the circuit. First samples of a plurality of signals associated with the alternating signals are captured using a first capture clock, of which sampling instants are synchronous to a second clock. Second samples of the first samples are then captured using a second capture clock, of which sampling instants are also synchronous to the second clock. The captured second samples are conveyed via a shift register to a plurality of modulo counters. The measured signal delay includes a timing skew associated with the first clock and a timing skew of the first capture clock but not a timing skew of the second capture clock.