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:
Dec. 11, 2001
Filed:
Feb. 29, 2000
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
G04F 1/004 ;
U.S. Cl.
CPC ...
G04F 1/004 ;
Abstract
A semiconductor integrated circuit device has a data holding section for storing information, a counter for counting the number of externally applied pulses, and a comparison/verification section. The comparison/verification section compares an output of the counter with an output of the data holding section, and verifies whether the outputs match or not. This configuration serves to reduce the number of wiring lines formed from pads to a comparison/verification circuit (a signature circuit), and thereby achieves a reduction in layout area and facilitates efficient layout work.