DMA transfer system using virtual channels

Details DMA transfer system using virtual channels DMA transfer system using virtual channels

2011-06-28

2011-06-28

Tsai, Henry W (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S040000

Reexamination Certificate

active

07970959

ABSTRACT:
A DMA transfer system includes a DMA controller having at least one channel coupled to a system bus, the DMA controller configured to perform a DMA transfer via the system bus according to a DMA transfer setting of the at least one channel, and a DMAC control unit coupled to the DMA controller, wherein the DMAC control unit includes a plurality of virtual channels configured to have respective DMA transfer settings made thereto, a virtual channel arbiter configured to select one of the plurality of virtual channels, and a DMA setting circuit configured to read a DMA transfer setting of the selected virtual channel to write the read DMA transfer setting to the at least one channel of the DMA controller.

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Japanese Office Action issued on Aug. 18, 2009 in corresponding Japanese Patent Application 2005-268217.

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