| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption.SOLUTION: A transfer request issuing circuit 41a of a bus master 21a issues a write transfer request WRa containing dependent information indicating a functional block 31b having a dependency relationship with a functional block 31a and a bus master 21b containing the functional block 31b on the basis of the state of the functional block 31a and information of a storage unit 53a. A write arbitration circuit 61W of a bus controller 22 stores a received write transfer request WRa in a write queue 62W. An information transmission circuit 63 of the bus controller 22 transmits the number of waiting stages and dependent information to the bus master 21b having a dependency relationship on the basis of the write transfer request in the write queue 62W. A clock control circuit 43b of the bus master 21b acquires a threshold value corresponding to the bus master 21a from a storage unit 52b on the basis of the dependent information, and controls a clock signal CKTb with respect to a transfer request issuing circuit 41b on the basis of the threshold value and the number of waiting stages. |
