[alsa-devel] Question: PCM short and long sync formats

Mark Brown broonie at opensource.wolfsonmicro.com
Mon Mar 26 12:26:50 CEST 2012

On Mon, Mar 26, 2012 at 02:36:53PM +0530, Omair Mohammed Abdullah wrote:
> On Wednesday 21 March 2012 05:21 PM, Mark Brown wrote:

> >What do you mean when you say "PCM short frame sync" and "PCM long
> >frame sync"?

> Sorry for the late reply, I was away.

> What I mean by short/long frame sync is: the frame sync lasts for 1
> bit/1 word wide.

> Eg.: For short frame sync, we get a frame sync signal for 1 clock
> before the first bit on the RX/TX.

> It is different from I2S mode where the frame sync is inverted and
> the transition starts 1 clock before the bits and lasts till bit 1.

I'm sorry but I still have no idea what you're talking about.  You've
described PCM mode but not explained what "short frame sync" and "long
frame sync" mode are.  
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