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:
Mar. 18, 2003
Filed:
Dec. 16, 1999
Mitsuhiro Hamada, Hyogo, JP;
Jun Ohtani, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Row faulty bit storage memory corresponding to a spare row circuit and a column faulty bit storage memory corresponding to a spare column circuit are provided independently of each other, and faulty bits of these faulty bit storage memories are counted by a row faulty bit counter and a column faulty bit counter, respectively. Repairability of the faulty row and repairability of the faulty column are determined using the row faulty bit storage memory and the column faulty bit storage memory. A time required for determining repairability of the faulty bit of a semiconductor memory is reduced, and a storage capacity of the faulty bit storage memory is reduced.