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. 07, 2001
Filed:
Aug. 25, 2000
Semiconductor memory device capable of performing data reading/writing in units of plurality of bits
Applicant:
Inventor:
Toru Shiomi, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
In a cache memory, when column address signals designating a defective column of a tag memory are input, a control circuit may inactivate the tag memory and control a switch circuit so that a spare data input/output terminal of a data memory is coupled to a data bus between the tag memory and a logic circuit. Compared to the conventional case in which a defective column of the tag memory is only replaceable by a spare column within the same tag memory, the degree of freedom in redundancy, and also the yield increase.