| 摘要 |
PROBLEM TO BE SOLVED: To decrease useless transactions by issuing a transaction from a present cluster when the data of the required transaction are prepared in the external cache of the other cluster. SOLUTION: When the external cache requests re-inputting concerning a transaction issued to a system bus 300, an SRAM buffer 112 correspondently stores the ID of that transaction and an address. An ID comparator 111 compares a transaction ID signal 110 reported from the external cache with the transaction ID in the SRAM buffer 112. Then, a selecting means 113 selects an address corresponding to the coincident transaction ID compared by the ID comparator 111 and in the case of the transaction coincident as a result of comparison due to the ID comparator 111, a selecting means 105 executes operation for issuing the transaction to the system bus 300 after improving the priority of the selecting means 113.
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