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:
Oct. 23, 2007
Filed:
Jun. 06, 2005
Applicants:
Kyoji Marumoto, Kyoto, JP;
Yo Sawamura, Kyoto, JP;
Tatsuhiko Murata, Kyoto, JP;
Yoshiaki Suenaga, Kyoto, JP;
Inventors:
Kyoji Marumoto, Kyoto, JP;
Yo Sawamura, Kyoto, JP;
Tatsuhiko Murata, Kyoto, JP;
Yoshiaki Suenaga, Kyoto, JP;
Assignee:
Rohm Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 7/00 (2006.01); G11C 29/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A test circuit employs hardware to test a memory cell in a memory block. The address of an error cell detected is stored in a first or second error address register. Access made by a processor to the address of the error cell would be detected by a first or second address comparator. Data is then written to a first or second correction register, which serves as an alternative cell, or data is read from one of the registers.