US 2004/0167995 A1 · Data transfer control system, electronic instrument, program, and data transfer control method

Abstract

A data transfer control system receives a command packet ORB transferred through a bus BUS1 (IEEE1394), issues a command indicated by: ORB to a device connected to a bus BUS2 (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 ORB1 transferred before a bus reset with contents of a command packet ORB2 transferred after the bus reset. If the contents are different, a command issued based on ORB1 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 BUS2 until a DMA transfer is completed. Dummy data transfer is controlled by performing a dummy update on a pointer.

Claims20

Dependent claims

A data transfer control system for data transfer through a bus, comprising:

a command processing section which receives a command packet transferred through a first bus, issues a command indicated by the command packet to a device connected to a second bus, and orders start of a direct memory access (DMA) transfer through the second bus;
and
a command abort section which aborts the command issued to the device connected to the second bus based on the command packet after the completion of the DMA transfer started based on the command packet.

A data transfer control method for data transfer through a bus, the method comprising:

issuing a command indicated by a command packet transferred through a first bus, to a device connected to a second bus, and ordering start of a direct memory access (DMA) transfer through the second bus;
and
aborting the command issued to the device connected to the second bus based on the command packet after the completion of the DMA transfer started based on the command packet.

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims20