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:
Aug. 20, 2013
Filed:
May. 26, 2011
Yuichiro Ishii, Kanagawa, JP;
Atsushi Miyanishi, Kanagawa, JP;
Yuichiro Ishii, Kanagawa, JP;
Atsushi Miyanishi, Kanagawa, JP;
Renesas Electronics Corporation, Kanagawa, JP;
Abstract
A semiconductor memory device is provided in which erroneous writing to a dual port memory cell can be prevented without short-circuiting bit lines coupled to two ports. The first write driver applies voltage corresponding to the first write data to the first bit line, when activated. The first write assist driver applies voltage corresponding to the first write data to the second bit line, when activated. A row of the memory cell array for the first access through the first port is specified by the first row address, and a row of the memory cell array for the second access through the second port is specified by the second row address. The first write assist driver is activated at least on condition that the first write driver is activated and that the first row address and the second row address coincide.