From: Benny Sjostrand <gorm@cucumelo.org>
To: Friedrich.Ewaldt@gmx.de
Cc: alsa-devel@alsa-project.org
Subject: Re: (Terratec DMX Xfire seems to not have any secondary CODEC)
Date: Fri, 02 Aug 2002 20:30:42 +0200 [thread overview]
Message-ID: <3D4ACFD2.9050206@cucumelo.org> (raw)
In-Reply-To: 5423.1028299729@www15.gmx.net
>
>
>the Terratec DMX Xfire has got one(1) codec chip:
>
>C (that's the Crystal logo of cirrus logic)
>4294-JQ EP
>(ZTAHKE0109)
>
>the following link says
>"CS4294 CrystalClear 4channel
>AC97"
>http://www.plasma-online.de/index.html?content=http%3A//www.plasma-online.de/english/identify/picture/crystal.html
>
>but i don't know which version of AC97...
>
That's a good explication why it dont detect the secondary codec.
I've been reading the DataSheet of the 4294, and the CODEC is equiped
with two DAC's it's possible
to address each DAC independently, in that way having 4 independent
channels with one CODEC.
On the Hercules Game Theater XP (i believe) that the primary CODEC gives
output to front L/R headphones L/R,
the secondary rear L/R , center and subwoofer. Which in theory should be
8 indpendent channels, but you may want
the same output in fron L/R and headphones L/R, the 4294 CODEC is
default programmed to give the same output in
both channels (so far I can understand from the bloody spec.) which
explain why the headphones works fine with the Hercules Game Theater
XP, but dont explain why I got no output from center and subwoofer, and
dont explain why there is not
any output from all 4 channels on the Terratec board.
In conclusion, with the Terratec board we need to a different setup on
the CODEC, and probably some different setup on
the DSP to make the 4 channels work. And hopefully there is no unkown
GPIO to take care of.
/Benny
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prev parent reply other threads:[~2002-08-02 19:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-02 14:48 (no subject) Friedrich.Ewaldt
2002-08-02 18:30 ` Benny Sjostrand [this message]
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