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:
Aug. 06, 2002
Filed:
Jun. 17, 1996
Shigenori Miyauchi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor storage device comprises a flash memory and manages the sectors in the unit of groups each consisting of n sectors. A logical sector number is converted to a logical group number and an offset address, and a conversion table is provided to convert a logical group number to a physical group number. A logical sector number is divided with n to get a quotient and a remainder which are set as a logical group number and as an offset address. An access controller determines a physical group number corresponding to the logical group number with reference to the address conversion table, and it accesses a sector in correspondence to the offset address in the physical group number. Further, a group management information for each group is stored in a memory, and when a sector of a logical sector number is accessed, a physical group number of a group storing the data of the sector is traced by referring the conversion table and the group management information.