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. 08, 2015
Filed:
Aug. 30, 2013
Applicant:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Inventors:
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 3/06 (2006.01); G11C 16/10 (2006.01); G11C 11/56 (2006.01); G11C 16/30 (2006.01);
U.S. Cl.
CPC ...
G11C 16/10 (2013.01); G11C 11/5628 (2013.01); G11C 16/30 (2013.01);
Abstract
A semiconductor memory device includes a memory cell array having a plurality of memory cells, each memory cell configured to store plural bits of data, and a controller. The controller is configured to execute a write operation on the memory cells such that user data are written in at least one of the plural bits of data and prescribed data are written in the remaining bits of the plural bits of data. As a result, the number of bits of user data stored in the memory cells is less than the number of plural bits of data that each memory cell is configured to store.