SEMICONDUCTOR MEMORY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a highly reliable semiconductor memory device for adapted to a plurality of storage regions whose request levels are different from one another.

SOLUTION: The semiconductor memory device 20 comprises: a memory 21 which has a plurality of memory blocks having memory cells capable of storing a plurality of different kinds of data which require memory areas having different characteristics; and a memory controller 22 for managing the memory by using each of the memory blocks as a deletion unit. The memory controller 22 has a function for converting the logical address of the memory 21 into a physical address identifying the memory block, and executes processing to replace the memory block with a preregistered free block in rewriting the memory block. The memory controller 22 manages the different kinds of data stored in the memory 21 so as to store the same kind of data as before even after each of the memory blocks and the free blocks in the memory 21 is rewritten.

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