| 摘要 |
PROBLEM TO BE SOLVED: To realize DMA transfer between a transfer-source device and a transfer-destination device without providing any special hardware to the device when both the devices are different in port width. SOLUTION: A data transfer device is equipped with a 1st device which is connected to a common bus, a 2nd device which is connected to the common bus, a DMA controller which performs DMA transfer with a memory, and a control means of controlling data transfer between the 1st device and 2nd device, wherein the control means indicates DMA transfer from the 1st device to the memory to the DMA controller when receiving a request for data transfer from the 1st device to the 2nd device and indicates DMA transfer from the memory to the 2nd device to the DMA controller when the DMA transfer by the DMA controller ends. COPYRIGHT: (C)2005,JPO&NCIPI
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