CACHE MEMORY CONTROLLER

PROBLEM TO BE SOLVED: To prevent the overlapping transfer of the same block as the block which is being transferred by suppressing the transfer of the contents of the flag corresonding to the block including other access addresses on a cache memory to a cache memory when it indicates that contents is being transferred. SOLUTION: In the flag 206 of the address array of a cache memory controller, the information indicating that the contents of the specified block on a main memory is being transferred to the corresponding block on a cache memory is stored. When it indicates that the contents of the flag 206 is being transferred, the transfer of the contents to the cache memory is suppressed. Thus, when the block including the access address on the main memory is tranferred to the specified block on the cache memory, the overlapping transfer of the same block as the block which is being transferred can be prevented by the cache mishit generated in an other access address.