Data transfer method, the data transfer device, a communication interface method and a communication interface device

摘要

PROBLEM TO BE SOLVED: To efficiently transfer data between an outer bus and an inner bus in asynchronous communication.;SOLUTION: A packet obtained from the outer bus by asynchronous communication is stored in a first memory means. The packet of the first memory means is transferred to a second memory means through the inner bus. Data obtained by resolving the packet stored in the second memory means are transferred to an inner signal processing system. On the other hand, data from the inner signal processing system are made into the packet, are transferred to the second memory means and are transferred to a third memory means. Transfer between the first memory means and the second memory means and that between the second memory means and the third memory means are set to be DMA transfer. Head information showing whether the first unit data of DMA transfer are the head of the packet or not and the last information showing whether the last unit data are the last of the packet or not are set in a control register for DMA transfer. DMA transfer is performed in accordance with the setting of the control register and head information and last information are reflected on the transfer destination of DMA transfer.;COPYRIGHT: (C)2002,JPO