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. 02, 2016
Filed:
Aug. 30, 2012
Shinji Yonezawa, Tokyo, JP;
Takashi Hirao, Tokyo, JP;
Hirokuni Yano, Tokyo, JP;
Mitsunori Tadokoro, Kanagawa, JP;
Hiroki Matsudaira, Kanagawa, JP;
Akira Sawaoka, Kanagawa, JP;
Shinji Yonezawa, Tokyo, JP;
Takashi Hirao, Tokyo, JP;
Hirokuni Yano, Tokyo, JP;
Mitsunori Tadokoro, Kanagawa, JP;
Hiroki Matsudaira, Kanagawa, JP;
Akira Sawaoka, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A memory system in embodiments includes a nonvolatile semiconductor memory that stores user data, a forward lookup address translation table and a reverse lookup address translation table, and a controller. The controller is configured to determine that the user data stored in the nonvolatile semiconductor memory is valid or invalid based on these two tables. The controller may perform data organizing of selecting data determined valid and rewriting the data in a new block. The controller may perform write processing and rewriting processing to the new block alternately at a predetermined ratio. The controller may determine whether a predetermined condition is satisfied on a basis of addresses included in write requests and write data in the MLC mode when the condition is satisfied and write data in the SLC mode when the condition is not satisfied.