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. 14, 1999
Filed:
Aug. 20, 1998
Applicant:
Inventor:
Shigeru Kuhara, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 36523003 ;
Abstract
A semiconductor memory which is capable of enhancing its memory utilization efficiency and suppressing an increase in the memory area is provided. The semiconductor memory is equipped with a plurality of main memory blocks and a single redundancy memory block. A test ROM having a test program stored therein is stored in a portion of the redundancy memory block. If a defective memory cell is present in one of the main memory blocks, control means replaces this main memory block with the redundancy memory block. The test ROM is moved to an area within the main memory block in which the defective memory cell is not present.