DMA engine

Details DMA engine DMA engine

2011-08-09

2011-08-09

Park, Ilwoo (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S020000, C710S021000, C710S023000

Reexamination Certificate

active

07996581

ABSTRACT:
A circuit and corresponding method for transferring data. The circuit comprises: a CPU; a plurality of addressable devices; and a DMA engine coupled to the CPU and to those devices, the DMA engine comprising a plurality of DMA contexts each having fetch circuitry for fetching a DMA descriptor indicated by the CPU and transfer circuitry for transferring data from one to another of the devices based on a fetched descriptor. The DMA engine further comprises switching means operable to control a group of the contexts to alternate in a complementary sequence between fetching and performing a transfer, such that alternately one or more contexts in the group fetch while one or more others perform a transfer.

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patent: 2008/0222317 (2008-09-01), Go et al.
patent: W02006/117562 (2006-11-01), None

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