From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailout.fastq.com ([204.62.193.66]) by pentafluge.infradead.org with esmtp (Exim 4.14 #3 (Red Hat Linux)) id 19aebU-0001mo-Jr for ; Thu, 10 Jul 2003 17:49:09 +0100 Received: from aquaman (foobar@russ.gothicfury.com [65.39.81.227]) h6AGnJD48688 for ; Thu, 10 Jul 2003 09:49:19 -0700 (MST) (envelope-from Russ.Dill@asu.edu) From: Russ Dill To: jasmine@regolith.co.uk In-Reply-To: References: <1057846853.21073.378.camel@passion.cambridge.redhat.com> Message-Id: <1057855838.2659.333.camel@localhost> Mime-Version: 1.0 Date: 10 Jul 2003 09:50:38 -0700 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7bit cc: linux-mtd@lists.infradead.org cc: Charles Manning cc: David Woodhouse Subject: Re: nand flash driver Reply-To: Russ.Dill@asu.edu List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2003-07-10 at 08:12, jasmine@regolith.co.uk wrote: > On Thu, 10 Jul 2003, David Woodhouse wrote: > > > Hmmm. When sending multiple bytes of address, isn't ALE supposed to > > remain high for the entire duration, without going low again between > > cycles? How do you achieve this if it's on the address bus? > > By waiting to see if the next write is to the same address- it's not hard > to do that sort of thing in an FPGA or SoC. Since the only line involved > is the ALE to the NAND, there's no downside in hanging on a little longer > before dropping it. yup, and a CPLD only costs about $1 (32 io, 32 mc) or $2.65 for a 72io/72 mc. Makes this sort of thing pretty trivial, although for 2 or 3 signals, discrete logic will do just fine. -- Russ Dill