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. 09, 2001
Filed:
Oct. 07, 1998
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 2/900 ;
U.S. Cl.
CPC ...
G11C 2/900 ;
Abstract
In a semiconductor memory device having a plurality of data input/output pins, control pins (e.g. address pins and external control signal pins) are arranged parallel to each other on a chip. The plurality of data input/output pins are divided into a plurality of groups. Each group has a specific data input/output pin. The specific data input/output pin is lined up with the control pins. In a test mode, a signal is written into all memory cells by applying the signal to the specific data input/output pin. In addition, whether the signals read from all memory cells are correct or not is determined using the specific data input/output pin.