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:
Sep. 05, 2000
Filed:
Jan. 26, 1998
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
714-7 ; 714-7 ; 714-8 ; 714710 ; 365200 ;
Abstract
A memory having a plurality of memory cells and a plurality of redundant memory cells accesses a redundant memory cell in lieu of a failed memory cell. The memory is tested for failed memory cells. Addresses of detected failed memory cells are stored in a first set of registers, and addresses of redundant memory cells are stored in a second, corresponding set of registers. An external address is compared with the address stored in the first set of registers and if there is a match, the corresponding redundant memory cell address stored in the second register set is used to access the memory, in lieu of the external memory address.