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:
Nov. 06, 2018
Filed:
Oct. 02, 2017
Mentor Graphics Corporation, Wilsonville, OR (US);
Janusz Rajski, West Linn, OR (US);
Jerzy Tyszer, Poznan, PL;
Grzegorz Mrugalski, Strzalkowo, PL;
Mark Kassab, Wilsonville, OR (US);
Wu-Tung Cheng, Lake Oswego, OR (US);
Mentor Graphics Corporation, Wilsonville, OR (US);
Abstract
Disclosed herein are exemplary embodiments of a so-called 'X-press' test response compactor. Certain embodiments of the disclosed compactor comprise an overdrive section and scan chain selection logic. Certain embodiments of the disclosed technology offer compaction ratios on the order of 1000×. Exemplary embodiments of the disclosed compactor can maintain about the same coverage and about the same diagnostic resolution as that of conventional scan-based test scenarios. Some embodiments of a scan chain selection scheme can significantly reduce or entirely eliminate unknown states occurring in test responses that enter the compactor. Also disclosed herein are embodiments of on-chip comparator circuits and methods for generating control circuitry for masking selection circuits.