| 摘要 |
PROBLEM TO BE SOLVED: To transfer data from a plurality of devices through one bus without reducing a local transfer rate and deflecting transfer quantity among the devices. SOLUTION: A bus end state monitoring part 604 specifies which factor causes the end of a transaction of data transfer through a PCI bus 207 by a master device (any one of eight DMACs (which are not shown) built in DMA control parts 610, 611) and stores the specified result in a history storage part 620. An arbiter 606 selects an inner request for permitting the use of the PCI bus 207 on the basis of arbitration order in which priority for using the PCI bus 207 is determined for respective DMACs to be transmitting sources of the received inner request, reservation requests and the history of end factors of respective transactions informed from the bus end state monitoring part 604. COPYRIGHT: (C)2005,JPO&NCIPI
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