[From nobody Sat Aug 16 21:14:30 2008 Return-Path: <gta04-bounces@lists.internal.openmoko.org> Received: from mail.openmoko.org ([unix socket]) by mail.openmoko.org (Cyrus v2.1.18-IPv6-Debian-2.1.18-5.1) with LMTP; Tue, 15 Apr 2008 14:33:09 +0000 X-Sieve: CMU Sieve 2.2 Return-path: <gta04-bounces@lists.internal.openmoko.org> Received: from sita.openmoko.org ([88.198.124.203]) by mail.openmoko.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.63) (envelope-from <gta04-bounces@lists.internal.openmoko.org>) id 1JlmDd-0002xs-De; Tue, 15 Apr 2008 14:33:09 +0000 Received: from internal.openmoko.org ([88.198.93.220] helo=varaha.openmoko.org) by sita.openmoko.org with esmtp (Exim 4.50) id 1JlmDR-0002f3-J9; Tue, 15 Apr 2008 16:33:09 +0200 Received: from localhost ([127.0.0.1] helo=varaha.openmoko.org) by varaha.openmoko.org with esmtp (Exim 4.50) id 1JlmDG-0006CM-4D; Tue, 15 Apr 2008 16:32:46 +0200 Received: from www.xora.org.uk ([80.68.91.202] helo=xora.org.uk) by varaha.openmoko.org with esmtp (Exim 4.50) id 1JlmDB-0006AS-Sf for gta04@lists.internal.openmoko.org; Tue, 15 Apr 2008 16:32:44 +0200 Received: from xora.org.uk ([::ffff:78.86.128.56]) (AUTH: LOGIN dp, SSL: TLSv1/SSLv3,128bits,AES128-SHA) by xora.org.uk with esmtp; Tue, 15 Apr 2008 15:32:37 +0100 id 00050387.4804BC85.000079D1 Date: Tue, 15 Apr 2008 15:32:47 +0100 From: Graeme Gregory <graeme@openmoko.org> To: Andy Green <andy@openmoko.com> Message-ID: <20080415143247.GJ31722@cimmeria> References: <20080415132946.GF31722@cimmeria> <4804B0D4.5080508@openmoko.com> <20080415134804.GG31722@cimmeria> <4804B479.60204@openmoko.com> <20080415140831.GI31722@cimmeria> <4804B9CB.40500@openmoko.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline In-Reply-To: <4804B9CB.40500@openmoko.com> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Cc: gta04@lists.internal.openmoko.org X-BeenThere: gta04@lists.internal.openmoko.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: gta04.lists.internal.openmoko.org List-Unsubscribe: <https://lists.internal.openmoko.org/mailman/listinfo/gta04>, <mailto:gta04-request@lists.internal.openmoko.org?subject=unsubscribe> List-Archive: <http://lists.internal.openmoko.org/pipermail/gta04> List-Post: <mailto:gta04@lists.internal.openmoko.org> List-Help: <mailto:gta04-request@lists.internal.openmoko.org?subject=help> List-Subscribe: <https://lists.internal.openmoko.org/mailman/listinfo/gta04>, <mailto:gta04-request@lists.internal.openmoko.org?subject=subscribe> Sender: gta04-bounces@lists.internal.openmoko.org Errors-To: gta04-bounces@lists.internal.openmoko.org Subject: Re: [gta04] GTA04 Bluetooth and VOIP X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on sita.openmoko.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,SPF_HELO_PASS autolearn=ham version=3.0.3 X-SA-Exim-Version: 4.2 (built Thu, 03 Mar 2005 10:44:12 +0100) On Tue, Apr 15, 2008 at 03:20:59PM +0100, Andy Green wrote: > It is true there are just some crappy canned division ratios. However > on p36-3 of the SC36400X54_UM_PreliminaryRev0.0_20071019.pdf document it > says: > > ''Master or slave mode can be selected by setting IMS bit of IISMOD > register. In master mode, I2SSCLK and I2SLRCLK are generated internally > and supplied to external device. Therefore a root clock is needed for > generating I2SSCLK and I2SLRCLK by dividing. The IIS pre-scaler (clock > divider) is employed for generating a root clock with divided frequency > from internal system clock. In external master mode, the root clock can > be fed from IIS external directly. <<<==== > > The I2SSCLK and I2SLRCLK are supplied from the pin (GPIOs) in slave mode.'' > > So we can be in master mode at CPU and yet still accept external I2S > clock from Codec. > > The WM8753 uses a PLL to generate the special I2S clock, the PLL output > is issues on the CLK1 / CLK2 pins so it is accessible even if the WM8753 > I2S side is also in slave. > Thanks for that info, I find the s3c6400 pdf hard to read as evince takes 100% cpu load spewing korean fonts errors. This mode is how the pxa boards drive wolfson codecs. Its certainly easier in some respects as when cpu is master you cant lockup waiting for codec. Graeme _______________________________________________ gta04 mailing list gta04@lists.internal.openmoko.org https://lists.internal.openmoko.org/mailman/listinfo/gta04 ]