| 摘要 |
PURPOSE:To improve the hit rate of a data at memory access by controlling a split block being a storage unit of a cache memory to have a split number or capacity or the like in response to a program or the like to be executed. CONSTITUTION:A variable length cache memory 5 is adopted and, for example, a split number (n) of split blocks BL0-BLn-1 of the cache memory 5 is made variable to change the capacitance of each of the split blocks BL0-BLn-1. A history data such as memory operating state, memory access pattern or frequency of user or the like corresponding to a prescribed software program to be executed is written in a history memory 4 in advance and the split block length of the cache memory 5 is controlled depending on the history of the memory access. Thus, the hit rate of data at memory access is increased.
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