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. 08, 1996
Filed:
Oct. 28, 1994
Applicant:
Inventor:
Akihiko Kagami, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ;
U.S. Cl.
CPC ...
365200 ; 36518907 ; 365201 ; 3652257 ; 36523003 ; 36523008 ;
Abstract
A semiconductor memory device has address buffer circuits operative to produce address predecoded signals for enabling an addressing system to selectively make memory cell sub-arrays accessible, a prohibit circuit operative to fix address predecoded signal or signals to inactive level for prohibiting the associated memory cell sub-arrays from a service as a data storage and an information storage circuit for storing pieces of test information indicative of the memory cell sub-arrays prohibited from the service, and a manufacturer easily groups the products by the available memory cell sub-arrays after package of the products.