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| From: | |
| Reply To: | DesignerCouncil E-Mail Forum. |
| Date: | Mon, 14 Sep 1998 06:21:31 -0700 |
| Content-Type: | text/plain |
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The flowchart ideas of CAD companies how to synchronize schematics and
layout have fundamental flaws:
1. It assumes a schematic is finished before a layout starts
2. It does not allow concurrent engineering changes in layout and schematic
at the same time
3. It assumes that layout designers can (is allowed to) change a schematic
4. It assumes that a layout designer has access to schematic software and
files.
We have found that what people want is a good way of comparing schematic and
layout during any stage of the design process.
We at www.rsi-inc.com have designed a program called DELTANET, which can
compare BOM and NETLIST data at any stage of the design and create a diff
list, which the user than can evaluate the result and make the necessary
modifications.
Wolfgang
-----Original Message-----
From: Jon R. DeGenova <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Monday, September 14, 1998 5:49 AM
Subject: Re: [DC] ECO Control using PADS & Viewdraw.
>Derek,
>
>One thing I have found to be an absolute necessity is to freeze a copy of
>the schematic after generating the Pads netlist until you are ready for
back
>annotation from Pads or need to forward annotate schematic changes while
>layout is in process. What I have found to happen is that while the board
>is in layout, the engineer makes changes to the schematic. If both the
Pads
>and Viewlogic netlists have changed, automatic synchronization may become
>nearly impossible. Only change one netlist at a time (either Pads or
>Viewlogic), then synchronize the two before any other changes are made.
>
>We have also found that it is cleaner to make netlist changes in viewlogic
>and forward annotate them to Pads, as opposed to using the Pads ECO
>functions to change any connections. We limit Pads netlist changes to
>resequencing of the reference designators. It also helps to have one
person
>who understands both programs in control of the Viewlogic schematic and the
>Pads layout if possible. If the two are controlled by different
>individuals, both must understand how their changes affect the other
program
>and keep clear communication throughout the development cycle.
>
>Jon DeGenova
>Micro Industries
>
>> -----Original Message-----
>> From: DesignerCouncil [mailto:[log in to unmask]]On
>> Behalf Of Derek
>> Wynne
>> Sent: Monday, September 14, 1998 6:38 AM
>> To: [log in to unmask]
>> Subject: [DC] ECO Control using PADS & Viewdraw.
>>
>>
>> This message is in MIME format. Since your mail reader does
>> not understand
>> this format, some or all of this message may not be legible.
>>
>> ------ =_NextPart_001_01BDDFCB.BD246E50
>> Content-Type: text/plain;
>> charset="iso-8859-1"
>> Content-Transfer-Encoding: quoted-printable
>>
>> Hi Folks,=20
>>
>> We are having nightmarish problems controlling Eco's while using
>> Viewdraw and PAD's.=20
>> The process is so open to disastrous error by the operator that it has
>> cost us significant=20
>> amounts of time back-tracking to recover files and data. Has anyone =
>> else
>> had experience of the=20
>> interface between these tools and if so what procedures did you use to
>> control the process.=20
>>
>>
>> Thanks in advance.=20
>>
>> Derek=20
>>
>>
>>
>>
>> Derek J. Wynne=20
>> Design Engineer.=20
>> Toucan Technology Ltd.=20
>> I.D.A. Business Park=20
>> Dangan=20
>> Galway City=20
>> Ireland.=20
>> =20
>> Telephone: +35391519913=20
>> Fax: +35391519901=20
>> E-mail: [log in to unmask] < mailto:[log in to unmask]>=20
>> =20
>>
>>
>> ------ =_NextPart_001_01BDDFCB.BD246E50
>> Content-Type: text/html;
>> charset="iso-8859-1"
>> Content-Transfer-Encoding: quoted-printable
>>
>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
>> <HTML>
>> <HEAD>
>>
>> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
>> 5.5.1960.3">
>> <TITLE>ECO Control using PADS & Viewdraw.</TITLE>
>> </HEAD>
>> <BODY>
>>
>> <P><FONT SIZE=3D2>Hi Folks,</FONT>
>> </P>
>>
>> <P><FONT SIZE=3D2>We are having nightmarish problems
>> controlling Eco's =
>> while using Viewdraw and PAD's.</FONT>
>> <BR><FONT SIZE=3D2>The process is so open to disastrous error by the =
>> operator that it has cost us significant </FONT>
>> <BR><FONT SIZE=3D2>amounts of time back-tracking to recover
>> files and =
>> data. Has anyone else had experience of the </FONT>
>> <BR><FONT SIZE=3D2>interface between these tools and if so what =
>> procedures did you use to control the process.</FONT>
>> </P>
>> <BR>
>>
>> <P><FONT SIZE=3D2>Thanks in advance.</FONT>
>> </P>
>>
>> <P><FONT SIZE=3D2>Derek</FONT>
>> </P>
>> <BR>
>> <BR>
>> <BR>
>>
>> <P><FONT SIZE=3D2>Derek J. Wynne</FONT>
>> <BR><FONT SIZE=3D2>Design Engineer.</FONT>
>> <BR><FONT SIZE=3D2>Toucan Technology Ltd.</FONT>
>> <BR><FONT SIZE=3D2>I.D.A. Business Park</FONT>
>> <BR><FONT SIZE=3D2>Dangan</FONT>
>> <BR><FONT SIZE=3D2>Galway City</FONT>
>> <BR><FONT SIZE=3D2>Ireland.</FONT>
>> <BR><FONT SIZE=3D2>=A0</FONT>
>> <BR><FONT SIZE=3D2>Telephone: +35391519913</FONT>
>> <BR><FONT SIZE=3D2>Fax:=A0=A0=A0=A0=A0=A0=A0=A0=A0 +35391519901</FONT>
>> <BR><FONT SIZE=3D2>E-mail:=A0=A0=A0=A0=A0=A0 [log in to unmask] <<A =
>> HREF=3D"mailto:[log in to unmask]" =
>> TARGET=3D"_blank">mailto:[log in to unmask]</A>> </FONT>
>> <BR><FONT SIZE=3D2>=A0</FONT>
>> </P>
>>
>> </BODY>
>> </HTML>
>> ------ =_NextPart_001_01BDDFCB.BD246E50--
>
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