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. 24, 2012
Filed:
Dec. 22, 2008
Janusz Rajski, West Linn, OR (US);
Dariusz Czysz, Wielkopolski, PL;
Grzegorz Mrugalski, Strzalkowo, PL;
Nilanjan Mukherjee, Wilsonville, OR (US);
Jerzy Tyszer, Poznan, PL;
Janusz Rajski, West Linn, OR (US);
Dariusz Czysz, Wielkopolski, PL;
Grzegorz Mrugalski, Strzalkowo, PL;
Nilanjan Mukherjee, Wilsonville, OR (US);
Jerzy Tyszer, Poznan, PL;
Mentor Graphics Corporation, Wilsonville, OR (US);
Abstract
Built-in self-test techniques for integrated circuits that address the issue of unknown states. Some implementations use a specialized scan chain selector coupled to a time compactor. The presence of the specialized scan chain selector increases the efficiency in masking X states. Also disclosed are: (1) an architecture of a selector that works with multiple scan chains and time compactors, (2) a method for determining and encoding per cycle scan chain selection masks used subsequently to suppress X states, and (3) a method to handle an over-masking phenomenon.