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:
Jun. 04, 2002
Filed:
Mar. 26, 2001
Applicant:
Inventors:
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 1/606 ;
U.S. Cl.
CPC ...
G11C 1/606 ;
Abstract
A semiconductor memory device includes: a plurality of memory cell regions, each comprising at least one memory cell; a non-volatile memory section which accepts external writing; and unselecting means for designating at least one of the plurality of memory cell regions to be inaccessible based on data written to the non-volatile memory section. At least one operation type is performed for at least one accessible memory cell region, which is not designated to be inaccessible, among the plurality of memory cell regions.