Messages in this thread |  | | Date | Mon, 06 Dec 1999 14:10:53 +0100 | From | Thomas Sailer <> | Subject | Re: Anyone talking to AC97 codecs? |
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Jeff Garzik wrote:
> exactly what data is written to the scatter-gather DMA buffers?
That depends on what the VIA chip does to the data. Most AC97 controllers like the ES1371 include a sample format converter and a sample rate converter between AC97 and the BMDMA engine.
> The AC97 docs talk about input and output slots, so I presume that an > audio frame needs a special AC97 header of some sort...
On ACLink it's just 20bit signed stereo samples (sent with a framing protocol that is surely handled in hardware).
Tom
NB: What datasheets do you have from VIA?
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