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:
Feb. 22, 2011
Filed:
Dec. 15, 2008
Masanobu Shirakawa, Chigasaki, JP;
Toshio Yamamura, Yokohama, JP;
Masanobu Shirakawa, Chigasaki, JP;
Toshio Yamamura, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A nonvolatile semiconductor storage device includes: a memory cell array in which electrically rewritable nonvolatile memory cells are arranged; and a register that holds good/bad information on a specific area that requires high reliability in a user accessible area of the memory cell array. An address conversion circuit internally accesses, when the specific area is bad and is accessed, a backup area in the user accessible area based on the good/bad information in the register. When the specific area is bad and the backup area is accessed, on the other hand, the address conversion circuit internally accesses the specific area based on the good/bad information in the register.