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:
Oct. 14, 2003
Filed:
Apr. 26, 2002
Mitsuhiro Higashiho, Beppu, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In a semiconductor memory device which has a plurality of operation modes and can reduce a consumed electric current by carrying out the switching control of an internal signal for every operation mode by required minimum control, a control method thereof, and a control method of a semiconductor device, there are provided an address switching circuit for propagating either a refresh address ADD (Ref) from a refresh counter at a time of a refresh mode or an external address ADD (R/W) at a time of data-input/output mode as internal address ADD (INT), a mode discriminating circuit for discriminating between a refresh operation requesting signal REQ (Ref) and a data input/output requesting signal REQ (R/W) and for outputting a mode discriminating signal M, and a switch holding circuit for outputting a switch change-over signal SW in accordance with the mode discriminating signal M, and the connection of the address switching circuit is switched only at a time of a mode change.