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. 01, 2002
Filed:
Mar. 27, 2001
Atsushi Nakayama, Yokohama, JP;
Ryo Haga, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A semiconductor memory device comprises a data line shifting circuit for connecting a plurality of data lines and spare data lines to a plurality of I/O data lines, a plurality of I/O numbering circuits for assigning the I/O data lines shift indicating numbers as locational information, the shift indicating numbers incrementing by one for each start point for data line shifting executed by the data line shifting circuit, a selection circuit for storing the correlationship between defective column addresses and the shift indicating numbers and outputting a selection signal corresponding to the shift indicating numbers when a defective-column address is input, a shift control circuit for comparing the selection signal with the shift indicating numbers and outputting a shift control signal to the data line shifting circuit based on a result of the comparison, and a number setting selecting circuit for selectively using a plurality of I/O numbering circuits.