DATA TRANSFER METHOD, DATA TRANSFER DEVICE, COMMUNICATION INTERFACE METHOD, AND COMMUNICATION INTERFACE DEVICE

摘要

Data transfer can be efficiently performed between an external bus and an internal bus in an asynchronous transfer system. A packet acquired from the external bus through asynchronous communication is stored in a first memory means and DMA-transferred to a second memory means via the internal bus. The data acquired by decomposing the packet stored in the second memory means is transferred to an internal signal processing system. Meanwhile, the data from the internal signal processing system is assembled into a packet, transferred to the second memory means, and DMA-transferred to a third memory means. First part information indicating whether or not the first unit data DMA-transferred is the first part of the packet and last part information indicating whether or not the last unit data is the last part of the packet are set in a control register for DMA-transfer. DMA-transfer is performed according to the setting of the control register to allow the transfer destination to reflect the first part information and the last part information.