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:
Apr. 05, 2005
Filed:
Mar. 07, 2001
Hiroyuki Takahashi, Tokyo, JP;
Hideo Inaba, Tokyo, JP;
Masatoshi Sonoda, Tokyo, JP;
Yoshiyuki Kato, Tokyo, JP;
Atsushi Nakagawa, Tokyo, JP;
Hiroyuki Takahashi, Tokyo, JP;
Hideo Inaba, Tokyo, JP;
Masatoshi Sonoda, Tokyo, JP;
Yoshiyuki Kato, Tokyo, JP;
Atsushi Nakagawa, Tokyo, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
A semiconductor memory device capable of accelerating address access and shortening cycle time is provided. A first address decoder () and first refresh address decoder () respectively decode an external address (Xn) supplied from outside the semiconductor memory device and a refresh address (RXn) used for refreshing within the semiconductor memory device. A multiplexer () selects the external address side decode signal (XnDm) or the refresh address side decode signal (XnRm) and outputs the signal as a decode signal (XnMm) based on an external address transmission signal (EXTR) and refresh address transmission signal (RFTR) so that a refresh operation and a read/write operation is performed continuously within one memory cycle. A word driver () then decodes decode signals (XnMm, XpMq) selected with multiplexer () and so forth, and activates a word line (WLmq).