From owner-ibis Wed Jun 12 11:42:00 1996 Received: from pacific.mea.com (pacific.mea.com [140.237.7.4]) by vhdl.vhdl.org (8.7.3/8.7.3) with SMTP id LAA21655 for ; Wed, 12 Jun 1996 11:41:59 -0700 (PDT) Received: from gatekeeper.msai.mea.com by pacific.mea.com with SMTP (1.38.193.4/16.2) id AA29355; Wed, 12 Jun 1996 14:31:53 -0400 Received: (from uucp@localhost) by gatekeeper.msai.mea.com (8.6.12/8.6.12) id OAA27549 for ; Wed, 12 Jun 1996 14:18:32 -0400 Received: from unknown(198.28.5.20) by gatekeeper.msai.mea.com via smap (V1.3) id sma027535; Wed Jun 12 14:18:10 1996 Received: from sbedrock.msai.mea.com (shared [192.65.252.62]) by msai.mea.com (8.6.12/8.6.12) with SMTP id OAA03763; Wed, 12 Jun 1996 14:32:30 -0400 Received: from sfred.msaiasic by sbedrock.msai.mea.com (4.1/mh-version 2.4) id AA19932; Wed, 12 Jun 96 14:30:10 EDT Date: Wed, 12 Jun 96 14:30:10 EDT From: hoang@msai.mea.com (Hoang Nguyen) Message-Id: <9606121830.AA19932@sbedrock.msai.mea.com> To: ibis-users@vhdl.org Subject: s2ibis translator Cc: hoang@msai.mea.com Hello IBIS gurus: I have a couple questions concerning s2ibis program usage. If you have similar experience, please inform me. 1. I can't find a way to make use of multiple voltage sources in the netlist. So I modified each spice input files after they are created by s2ibis, then re-run s2ibis. Please advise. 2. Also, I cannot combine input ckt and output/I/O ckt in one s2ibis spice file, so not all buffer models in a component can be generated in one pass thru s2ibis program, but rather in several passes for each buffer type. Then I manually combine them into ibis model, and run the parser thru. Do you have any comment on this? Could we make the suggestion to enhance s2ibis program? Thank you for any inputs on these. And thanks Syed for your answers on my other questions. Regards, Hoang Nguyen hoang@msai.mea.com 919-479-3479 Mitsubishi Semiconductor America, Inc. Durham, North Carolina From owner-ibis Thu Jun 13 17:50:31 1996 Received: from natsemi-bh.nsc.com (natsemi-bh.nsc.com [204.163.202.66]) by vhdl.vhdl.org (8.7.3/8.7.3) with SMTP id RAA06462 for ; Thu, 13 Jun 1996 17:50:31 -0700 (PDT) Received: (from uucp@localhost) by natsemi-bh.nsc.com (8.6.12/8.6.11) id RAA20937; Thu, 13 Jun 1996 17:44:04 -0700 Received: from nsc.nsc.com by natsemi-bh.nsc.com via smap (V1.3) id sma020836; Thu Jun 13 17:43:54 1996 Received: from lightning-gw.nsc.com by nsc.nsc.com (5.65/1.34) with SMTP id AA18766 for ibis-users@vhdl.org; Thu, 13 Jun 96 17:40:42 -0700 Received: from kural by rockie.nsc.com (4.1/SMI-4.1) id AA06523; Thu, 13 Jun 96 17:44:05 PDT Date: Thu, 13 Jun 96 17:44:05 PDT From: huq@rockie.nsc.com (Syed Huq) Message-Id: <9606140044.AA06523@rockie.nsc.com> To: ibis-users@vhdl.org, hoang@msai.mea.com Subject: Re: s2ibis translator Hoang, Do you mind if I post this on the reflector. I do not have an answer for this. Pls advice. Regards, Syed. > From owner-ibis@vhdl.vhdl.org Wed Jun 12 11:51:59 1996 > Date: Wed, 12 Jun 96 14:30:10 EDT > From: hoang@msai.mea.com (Hoang Nguyen) > To: ibis-users@vhdl.org > Subject: s2ibis translator > Cc: hoang@msai.mea.com > Content-Length: 931 > > > Hello IBIS gurus: > > I have a couple questions concerning s2ibis program usage. If you have > similar experience, please inform me. > > 1. I can't find a way to make use of multiple voltage sources > in the netlist. So I modified each spice input files after they are > created by s2ibis, then re-run s2ibis. Please advise. > > 2. Also, I cannot combine input ckt and output/I/O ckt in one s2ibis spice > file, so not all buffer models in a component can be generated in one pass > thru s2ibis program, but rather in several passes for each buffer type. > Then I manually combine them into ibis model, and run the parser thru. > Do you have any comment on this? Could we make the suggestion to enhance > s2ibis program? > > Thank you for any inputs on these. And thanks Syed for your answers on my other > questions. > > Regards, > > Hoang Nguyen > hoang@msai.mea.com > 919-479-3479 > > Mitsubishi Semiconductor America, Inc. > Durham, North Carolina > > From owner-ibis Fri Jun 14 11:40:43 1996 Received: from icx.com (root@fw.icx.com [205.238.6.33]) by vhdl.vhdl.org (8.7.3/8.7.3) with SMTP id LAA29877 for ; Fri, 14 Jun 1996 11:40:42 -0700 (PDT) Received: by icx.com (/\oo/\ Smail3.1.29.1 #29.2) id ; Fri, 14 Jun 96 11:30 PDT Received: by icx.com (/\==/\ Smail3.1.28.1 #28.14) id ; Fri, 14 Jun 96 11:30 PDT Received: by icx.com (/\==/\ Smail3.1.28.1 #28.14) id ; Fri, 14 Jun 96 11:33 PDT Message-Id: Date: Fri, 14 Jun 96 11:33 PDT From: bob@icx.com ( Bob Ross) To: hoang@msai.mea.com, ibis-users@vhdl.org Subject: Re: s2ibis translator Hoang: Regarding your questions, I will try to give a response without knowing the specific details. (1) Your approach is OK. However, if they are expected to change for min and max conditions, I sometimes augment the Spice code by creating the second supply dependent on the first. It could be a direct offset, or could be through a porportional divider. Other supplies might be set by options in the min and max models, although I have not done this. (2) I have had success with I/O structures. Sometimes, I just use 3-state and then change the Model_type afterwards since exactly the same data is produced. Generally I prefer partitiioning the problem and doing mulitple passes. Then any problem is more easily to isolate. However, for storing a reference script for documentation and later usage by someone else, putting all the models in one script makes sense. I have been successful by putting in subcircuit calls X... for each model. The problem may be that the pin number notation may be conflicting. By using the subcircuit call, you can define the pin number notation that the script references the Spice code to assure different numbers. Best Regards, Bob Ross Inerconnectix, Inc. > Date: Wed, 12 Jun 96 14:30:10 EDT > From: hoang@msai.mea.com (Hoang Nguyen) > Message-Id: <9606121830.AA19932@sbedrock.msai.mea.com> > To: ibis-users@vhdl.org > Subject: s2ibis translator > Cc: hoang@msai.mea.com > Status: RO > Hello IBIS gurus: > I have a couple questions concerning s2ibis program usage. If you have > similar experience, please inform me. > 1. I can't find a way to make use of multiple voltage sources > in the netlist. So I modified each spice input files after they are > created by s2ibis, then re-run s2ibis. Please advise. > 2. Also, I cannot combine input ckt and output/I/O ckt in one s2ibis spice > file, so not all buffer models in a component can be generated in one pass > thru s2ibis program, but rather in several passes for each buffer type. > Then I manually combine them into ibis model, and run the parser thru. > Do you have any comment on this? Could we make the suggestion to enhance > s2ibis program? > Thank you for any inputs on these. And thanks Syed for your answers on my other > questions. > Regards, > Hoang Nguyen > hoang@msai.mea.com > 919-479-3479 > Mitsubishi Semiconductor America, Inc. > Durham, North Carolina