Data transfer control system, electronic instrument, program, and data transfer control method

摘要

A data transfer control system receives a command packet ORB transferred through a bus BUS 1 (IEEE 1394), issues a command indicated by ORB to a device connected to a bus BUS 2 (ATA (IDE)/ATAPI), and orders start of a DMA transfer. The command issued based on ORB is aborted after the completion of the DMA transfer. The data transfer control system compares contents of a command packet ORB 1 transferred before a bus reset with contents of a command packet ORB 2 transferred after the bus reset. If the contents are different, a command issued based on ORB 1 is aborted after completion of a DMA transfer. Dummy data is transferred between the data transfer control system and the device connected to the bus BUS 2 until a DMA transfer is completed. Dummy data transfer is controlled by performing a dummy update on a pointer.