From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 16 Jan 2003 14:52:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 16 Jan 2003 14:52:29 -0500 Received: from adsl-109-100.gigavia.com.ar ([200.26.109.100]:26530 "EHLO morgoth.srv.sis.cooperativaobrera.com.ar") by vger.kernel.org with ESMTP id ; Thu, 16 Jan 2003 14:52:28 -0500 Message-ID: <3E270F58.9020609@bblanca.com.ar> Date: Thu, 16 Jan 2003 17:00:24 -0300 From: Gabriel Gomiz User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20021218 X-Accept-Language: en-us, en MIME-Version: 1.0 To: root@chaos.analogic.com CC: linux-kernel@vger.kernel.org Subject: Re: NCR 7452/3 POS - Retail CMOS NVRAM Driver References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Richard B. Johnson wrote: > On Wed, 15 Jan 2003, Gabriel Gomiz wrote: >> >>The memory chips that NCR uses are: >>1) NEC D43256BGU - NCR POS Model 7452-1011 >> The chip is 256KB, but NCR says they use only 128KB >>2) NEC D431000AGW - NCR POS Model 7453-1011 >> The chip is 1MB, but NCR says they use only 128KB >> > > Look in the ethernet drivers for the "bit-banging" routines > used to access NVRAM in the devices. You need to shift bits > in and out of these devices. They are SERIAL ERPROMS. You > can get data sheets by using your favorite search engine > (as I just did). I grabbed the datasheets of the memory chips and found out the following, that changes the incorrect information that I had: 1) NEC D43256BGU is 256Kbits = 32KB (32768 words of 8 bits) This chip has 15 address lines (A0-A14) and 8 data lines (I/O1 - I/O8). 2) NEC D431000AGW is 1Mbit = 128KB (131072 word of 8 bits) This chip has 17 address lines (A0-A16) and 8 data lines (I/O1 - I/O8). So it seems that these chips doesn't have a serial-like interface for bit-banging, I am wrong? -- .^. Gabriel Gomiz - Red Hat Certified Engineer (RHCE) /V\ // \\ /( )\ ^^-^^ s/Window[$s]/LINUX!!/g or die;