Re: [LAD] embedded high end audio

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To: linux-audio-dev <linux-audio-dev@...>
Date: Wednesday, July 30, 2008 - 8:52 pm

On Wed, 2008-07-30 at 15:31 -0500, Eric Shattow wrote:

I am living this one at the moment, needing a 32 in/32 out solution on
eurocards interfaced to PC104+...

The Envy24 is both difficult to source in small quantities and difficult
to run in multiple with accurate timing between the multiple chips BCLK
and LRCLK which you really need if your backplane has a single set of
these signals supporting this much IO.

The current plan is to make the audio interface look like a PATA disk
which just happens to have say 4 sectors each of an appropriate number
of samples, the logic to support this should fit in a couple of GALs or
similar, and the bandwidth (and DMA) is there, getting the IDE stack out
of the way might be a good trick however.

I am open to both sources of envy24s and ideas on how to get everything
synchronous (The best I came up with was to clock everything from the
superclock input and rig some logic so that under software control I can
cause this to drop individual clock pulses to each chip, then bring all
the LR and word clocks into a general purpose input and at start up spin
in a tight loop tweaking these timings until everything is in sync,
uggh)... Still better then trying to design a PCI bridge in a spartan or
similar!

Regards, Dan.

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Messages in current thread:
[LAD] embedded high end audio, porl sheean, (Mon Jul 21, 11:31 pm)
Re: [LAD] embedded high end audio, Phil Frost, (Wed Jul 23, 1:10 pm)
Re: [LAD] embedded high end audio, Eric Shattow, (Wed Jul 30, 8:31 pm)
Re: [LAD] embedded high end audio, Dan Mills, (Wed Jul 30, 8:52 pm)
Re: [LAD] embedded high end audio, Paul Davis, (Wed Jul 30, 9:30 pm)
Re: [LAD] embedded high end audio, Lee Revell, (Thu Jul 31, 12:21 am)
Re: [LAD] embedded high end audio, Dan Mills, (Thu Jul 31, 12:50 am)
Re: [LAD] embedded high end audio, porl sheean, (Thu Jul 31, 6:06 am)
Re: [LAD] embedded high end audio, Phil Frost, (Fri Aug 1, 9:12 pm)
Re: [LAD] embedded high end audio, Fons Adriaensen, (Fri Aug 1, 10:05 pm)
Re: [LAD] embedded high end audio, Eliot Blennerhassett, (Thu Jul 31, 10:29 pm)
Re: [LAD] embedded high end audio, Fons Adriaensen, (Fri Aug 1, 8:26 am)
Re: [LAD] embedded high end audio, Eliot Blennerhassett, (Mon Aug 4, 10:36 pm)
Re: [LAD] embedded high end audio, Paul Davis, (Fri Aug 1, 10:23 am)
Re: [LAD] embedded high end audio, porl sheean, (Fri Aug 1, 3:02 pm)
Re: [LAD] embedded high end audio, Fons Adriaensen, (Fri Aug 1, 5:08 pm)
Re: [LAD] embedded high end audio, porl sheean, (Sat Aug 2, 12:29 am)
Re: [LAD] embedded high end audio, St├ęphane Letz, (Sat Aug 2, 7:50 am)
Re: [LAD] embedded high end audio, Fons Adriaensen, (Sat Aug 2, 8:54 am)
Re: [LAD] embedded high end audio, Pieter Palmers, (Sat Aug 2, 10:07 am)
Re: [LAD] embedded high end audio, porl sheean, (Fri Aug 1, 12:21 am)
Re: [LAD] embedded high end audio, Eliot Blennerhassett, (Fri Aug 1, 2:04 am)
Re: [LAD] embedded high end audio, Stephen Sinclair, (Thu Jul 31, 2:18 pm)
Re: [LAD] embedded high end audio, Emanuel Rumpf, (Tue Jul 22, 5:09 pm)
Re: [LAD] embedded high end audio, porl sheean, (Tue Jul 22, 11:38 pm)