| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize a memory by dividing the memory into an area for storing address information of relatively high reference frequency and an area for storing address information of relatively low reference frequency and dynamically varying the border between the areas. SOLUTION: The timer value of address information in an address table RAM 120 is reset to 0 each time the address information is referred to and moved to the HIGH area 201 when address information in the LOW area 202 is referred to. When address information is newly registered in the address table RAM 120, the timer value of the address information is set to 0 and registered in the HIGH area 201. Consequently, two address tables of the HIGH area 201 and LOW area 202 are present in the memory; and the address information of high reference frequency is registered in the HIGH area 201 and address information of low reference frequency is registered in the LOW area 202, thereby shortening the reference time of the address information of high reference frequency.
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