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:
Apr. 28, 2015
Filed:
May. 11, 2012
Yosuke Ohashi, Aichi, JP;
Kazunori Arakawa, Aichi, JP;
Tetsuya Egawa, Aichi, JP;
Hidekazu Adachi, Aichi, JP;
Yosuke Ohashi, Aichi, JP;
Kazunori Arakawa, Aichi, JP;
Tetsuya Egawa, Aichi, JP;
Hidekazu Adachi, Aichi, JP;
Kabushiki Kaisha Tokai Rika Denki Seisakusho, Aichi, JP;
Abstract
In a flash memory device, after an updated value is copied from a first block to a second block, a block management value of the first block is set to an unused state, and maintenance is performed to erase data from the first block. When performing maintenance, the block management value of the first block Bis rewritten from '$FFF0' to '$FFFF.' When a reset occurs and the power supply is deactivated during the maintenance, the digit of “$0” in the block management value may become “1” to “E” of the hexadecimal system. In this manner, when the block management value includes a single digit of “1” to “E” and three digits of “F,” the reading of an updated value from the block corresponding to the block management value is restricted.