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. 12, 2008
Filed:
Mar. 10, 2005
Atsushi Shiraishi, Miyakonojyo, JP;
Atsushi Shikata, Higashiyamato, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Makoto Obata, Funabashi, JP;
Atsushi Shiraishi, Miyakonojyo, JP;
Atsushi Shikata, Higashiyamato, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Makoto Obata, Funabashi, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The present invention is directed to suppress data loss caused by power shut-down during a rewriting process and to shorten time required to make a depletion check. A nonvolatile memory apparatus includes a rewritable nonvolatile memory and a card controller. The nonvolatile memory has a physical address area corresponding to a logical address and a save area. In response to a data rewrite instruction on a required logical address, the card controller stores data in a predetermined physical address area corresponding to the logical address to the save area and rewrites the data stored in the physical address area. When rewriting of the physical address area is incomplete, the card controller rewrites the data in the physical address area with the data stored in the save area. Thus, data loss caused by the power shut-down can be suppressed by data backup, and it is sufficient to make the depletion check in two places of the save area and the physical address area.