| 摘要 |
PROBLEM TO BE SOLVED: To access a memory without being aware of the border of a storage area by converting a decomposed address into an address of the storage area and accessing addresses including the border of the storage area. SOLUTION: A memory map address converting circuit is composed of an address decomposing means 300, an address converting means 301, a storage area access means 302, a data decomposing means 310, a data merging means 311, and a fixed writing means 320. To read data out, an address 3b and an access size 3c are inputted to the address decomposing means 300 first and the address decomposing means 300 outputs an address 3e to be accessed. The address converting means 301 searches a storage area mapping management table for a storage area mapped to the outputted address 3e outputted to the address decomposing means 300. Then the address 3g of the storage area to be addressed is calculated from the head address of the set storage area and outputted.
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