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:
Jun. 12, 2001
Filed:
Jan. 20, 2000
Eiichi Nagai, Kawasaki, JP;
Chikai Ono, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention relates to a memory device, such as a FeRAM, of which redundancy structure is simplified. In the present invention, a redundancy file memory for recording a replacing information indicating the defective cell to be replaced into a redundancy cell is formed by a memory cell having the same structure as a normal memory cell, so that it is capable to access to a redundancy file memory at the same time when accessing to a normal memory cell. Then, the replacing information recorded in the redundancy file memory is concurrently read out when accessing to the normal memory cell, and the defective cell is replaced into a redundancy cell according to the replacing information.