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:
Jul. 12, 2011
Filed:
Aug. 19, 2009
Hideo Akiyoshi, Tokyo, JP;
Hideo Akiyoshi, Tokyo, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
A semiconductor memory includes: a plurality of regular memory cells; a first redundant memory cell; a second redundant memory cell; a first redundancy program circuit, first defect position information indicating a position of a first defective regular memory cell being programmed into the first redundancy program circuit; a second redundancy program circuit, second defect position information indicating a position of a second defective regular memory cell being programmed into the second redundancy program circuit; a redundancy switch circuit which couples signal lines to the regular memory cell, the first redundant memory cell, and the second redundant memory cell; and a redundancy signal switch circuit which replaces the first defect position information and the second defect position information with each other when the second defective regular memory cell is located between the first defective regular memory cell and the first redundant memory cell.