From mboxrd@z Thu Jan 1 00:00:00 1970 From: Omair Mohammed Abdullah Subject: Re: Question: PCM short and long sync formats Date: Mon, 26 Mar 2012 17:37:15 +0530 Message-ID: <4F705BF3.5080905@linux.intel.com> References: <4F69ABB0.2000706@linux.intel.com> <20120321115146.GC3226@opensource.wolfsonmicro.com> <4F7031AD.3090202@linux.intel.com> <20120326102650.GC3098@opensource.wolfsonmicro.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga03.intel.com (mga03.intel.com [143.182.124.21]) by alsa0.perex.cz (Postfix) with ESMTP id 7E3822490A for ; Mon, 26 Mar 2012 14:04:56 +0200 (CEST) In-Reply-To: <20120326102650.GC3098@opensource.wolfsonmicro.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: Mark Brown Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On Monday 26 March 2012 03:56 PM, Mark Brown wrote: > 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. This diagram may explain things better: http://picpaste.com/pcm_fs-7dBlrkuW.png