[alsa-devel] full duplex AD1848 (was SC-6000 driver)

[Krzysztof Helt]

On Thu, 06 Sep 2007 17:18:07 +0200
Rene Herman <rene.herman at gmail.com> wrote:

> On 09/06/2007 04:03 PM, Krzysztof Helt wrote:
> 
> > Dnia 6-09-2007 o godz. 13:20 Rene Herman napisał(a):
> 
> >> Sorry, incorrect -- the cs4231 is full duplex. It's only the cs4248
> >> (ad1848) which is not. Need to figure out how to do full duplex on a 
> >> sound galaxy; old driver didn't do so.
> >>

According to a datasheet, the AD1848K (which was a popular version of AD1848)
is full-duplex (can work in single-dma mode or with two dma channels).

The AD1848 in my SC-6000 is not the K version (at least it is not marked on
the chip) but I saw a photo on the net with SC-6000 and AD1848K (it had no
YMF-262 chip but a different one).

I am looking for the AD1848 datasheet  for the pre-K version (or list of
differences between K and earlier versions).

Also, I would like to know how you put your SG card into full-duplex mode.

It seems that hardware of AD1848/CS4231 was not used to its full potential
(SB compatibility was more important).

Regards,
Krzysztof