Mitsubishi Electric Corporation

Koji Kikkawa

Masanori Nakata

A microcomputer retains a group definition table associating the sector sections created by dividing all sectors into multiple sections under a given condition with different memory regions on a flash memory, respectively. A memory control section makes reference to the group definition table to identify a memory region corresponding to a specified sector, and searches the identified memory region range for a physical address corresponding to the specified sector. Furthermore, the memory control section moves a specified sector within the identified memory region range for rewriting data corresponding to the specified sector.

Memory controller

A data storage temporarily stores an address conversion table associating the sector numbers with the physical addresses for each file. A conversion table memory allocator allocates a memory region for the address conversion table corresponding to a file when a request is made to open the file. A file system manager releases the allocated memory region at a given time. The file system manager stores sector numbers of one or multiple sectors constituting a file in each record of the address conversion table for which the memory region is allocated in sequence. Then, a memory control section searches the flash memory to acquire a physical address corresponding to a sector number in the each record of the address conversion table, and stores each acquired physical address in the corresponding record.

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Tokyo, Japan

Koji Kikkawa