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. 04, 2011
Filed:
Sep. 10, 2008
Shinsuke Asari, Akishima, JP;
Chiaki Shinagawa, Kodaira, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Motoki Kanamori, Kariya, JP;
Atsushi Shiraishi, Miyakonojo, JP;
Shinsuke Asari, Akishima, JP;
Chiaki Shinagawa, Kodaira, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Motoki Kanamori, Kariya, JP;
Atsushi Shiraishi, Miyakonojo, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
The service life of memory cards is to be substantially elongated against the occurrence of faulty blocks. A control logic searches blocks in a nonvolatile memory cell array for any acquired fault on the basis of a fault-inviting code in a management information section. If any faulty block is detected, the faulty block will be subjected to write/read comparison of data to judge whether or not the data in the block are normal. Any block determined to be normal will undergo rewriting of its fault-inviting code and registered as a normal block. Further, the registered block is stored into a write management table in the management area as a writable block. This enables an essentially normal block judged faulty on account of an erratic error or some other reason to be restored.