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:
Mar. 03, 2020
Filed:
Dec. 31, 2015
Stmicroelectronics (Grenoble 2) Sas, Grenoble, FR;
David Jacquet, Vaulnaveys le Haut, FR;
Didier Fuin, Lumbin, FR;
STMICROELECTRONICS (GRENOBLE 2) SAS, Grenoble, FR;
Abstract
A digital circuit includes a scan chain which loads data into and unloads data from the digital circuit. Checking circuitry is coupled to the scan chain and generates a first digital signature based on data indicative of a pre-testing status of the digital circuit as the data is unloaded from the digital circuit via the scan chain. When testing is completed, the data is restored to the digital circuit via the scan chain. The checking circuitry generates a second digital signature as the data is loaded into the digital circuit. The first digital signature is compared to the second digital signature to verify an integrity of the process. A specific data pattern may be loaded into the scan chain as the data is unloaded. An output of the scan chain may be monitored to detect the pattern and an error signal may be generated based on when the pattern is detected.