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. 08, 1998
Filed:
Mar. 24, 1998
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ; G11C / ;
U.S. Cl.
CPC ...
36518511 ; 36518522 ; 36518529 ; 36518533 ; 365218 ;
Abstract
In a flash memory, a reading bit line and a writing bit line are provided corresponding to a respective column of memory cells. A well voltage and a voltage on a source line can be controlled for each sub-block. Accordingly, data can be read at a sub-block while data can be written/erased at another sub-block, and therefore, the capacity ratio of a back ground operation region to the main memory region can be changed as desired.