Data transfer control system, electronic instrument, and...

Details Data transfer control system, electronic instrument, and... Data transfer control system, electronic instrument, and...

2006-06-27

2006-06-27

Dang, Khanh (Department: 2111)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S033000, C710S035000, C710S105000

Reexamination Certificate

active

07069350

ABSTRACT:
A data transfer control system receives a command packet ORB (SBP-2) transferred through a bus BUS1(IEEE1394), and issues a command included in the ORB to a device connected with a bus BUS2(ATA (IDE)/ATAPI). The data transfer control system sets a sufficiently large fixed DMA data length irrespective of the type of the issued command, and instructs start of DMA transfer to or from the device connected with the bus BUS2. The data transfer control system aborts the DMA transfer when a device connected with BUS2informs of completion of command processing. As the fixed DMA data length, a value greater than a storage capacity of a storage or a value greater than a data length which can be designated by a command is employed. The data transfer control system issues a command included in the ORB to a device connected with the bus BUS2without decoding the command.

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What is Direct Memory Access (DMA)?.

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