System and method for transferring concurrent multi-media stream

Details System and method for transferring concurrent multi-media stream System and method for transferring concurrent multi-media stream

1997-09-19

2000-04-18

Palys, Joseph E.

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710 28, F04B 1502

Patent

active

060527447

ABSTRACT:
A multimedia system including a PCI bus master controller for transferring concurrent and independent video and audio data streams to video and audio devices. The controller includes a video request and DMA channel, a video sub-picture request and DMA channel, an audio request and DMA channel, and a decompressed video DMA and posted request channel for independently and concurrently transferring the data streams from host memory to the devices. The host processor builds lists of request packets in system memory and asynchronously submits the request packets to the controller. The request packets include commands which the request channels execute. The commands may include spinning on status conditions in registers of the multimedia devices, writing to registers of the devices, or performing bus master transfers of multimedia data streams from system memory to the devices. The device register accesses are performed by the controller on local buses thereby reducing PCI bus traffic.

REFERENCES:
patent: 5276845 (1994-01-01), Takayama
patent: 5613162 (1997-03-01), Kanenjian
patent: 5799150 (1998-08-01), Hamilton et al.
patent: 5809261 (1998-09-01), Lambrecht
patent: 5867626 (1999-02-01), Kawakami et al.

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