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:
Dec. 16, 2008
Filed:
Aug. 20, 2007
Applicants:
Hidenori Mitani, Hyogo, JP;
Tadaaki Yamauchi, Hyogo, JP;
Taku Ogura, Hyogo, JP;
Inventors:
Assignee:
Renesas Technology Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 16/28 (2006.01); G11C 16/26 (2006.01); G11C 7/14 (2006.01); G11C 7/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A multi-level semiconductor memory device for storing multi-level data having three or more values is implemented by utilizing a nonvolatile memory device for storing 2-valued data. Identification of successive 16-bit data externally applied is performed with external address bit AA [, and a storage block is selected with external address bit AA [. Upper word data LW and lower word data UW are compressed into byte data of 8 bits, respectively, and stored in a memory cell array.