I tend to agree with Lou. We have many schematics that are 50 pages or
more. Using Viewlogic as our schematic tool, drawing hierarchical
schematics has not been a problem. Backannotation has not been a
problem either. Signal referencing from sheet to sheet has been another
story however. Viewlogic claims to be working on that one though.
About half of our designs are not hierarchical designs, but often it
just makes sense to use them.
RICK MERLIN
[log in to unmask]
1845 McCandless Drive
Milpitas, CA 95035
1-800-538-5150
ext. 4161
>----------
>From: Louis Dallara[SMTP:[log in to unmask]]
>Reply To: DesignerCouncil E-Mail Forum.
>Sent: Tuesday, June 30, 1998 11:29 AM
>To: [log in to unmask]
>Subject: Re: [DC] Hierarchicial Schematic Design
>
>If your EE's are using FPGA's go hierarchical, if it a large
>schematic ie a complete system, with multiple EE's
>hierarchical makes sense from a control standpoint.
>
>Don't use hierarchical unless there's a need for it, some
>co's use it for everything witch is overkill.
>Flat faster and easier..
>Lou
>http://www.waterw.com/~ldallara
>
>Karl Bates wrote:
>
>> Derek,
>> We use hierarchical schematics at my location.
>>
>> Pros:
>> Easier to create multiple instances of a symbol. i.e. memory circuits /
>> subcircuits.
>> Less schematic pages
>>
>> Cons:
>> creates more questions about what you are really looking at (What you
>> see is not what you get).
>> some schematic packages have a problem with back annotation (making
>> refdes' appear properly or at all.
>>
>> My recommendation..... do not use hierarchical schematics. seems to
>> create more problems than it's worth.
>>
>> Karl
>>
>> Derek Wynne wrote:
>>
>> > Hi
>> >
>> > I am looking for some info on the PROs/CONs of hierarchical schematic
>> > design practices vs flat file schematic design.
>> >
>> > If anybody has written a paper on this or knows of a good book or has
>> > had experiences of the advantages or disadvantages of each method,
>> > please contact or mail me.
>> >
>> > All information appreciated.
>> >
>> > Regards,
>> >
>> > Derek Wynne.
>> >
>> > **************************
>> > Derek Wynne,
>> > Toucan Technology Limited,
>> > IDA Business Park,
>> > Dangan,
>> > Galway,
>> > Ireland.
>> > Tel 00 353 91 519900
>> > Fax 00 353 91 519901
>> > email [log in to unmask]
>> > **************************
>> >
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>> ------------------------------------------------------------------------
>>
>> Karl Bates <[log in to unmask]>
>> Senior PCB Designer
>> Northern Illinois IPC Designer Council President, Certified Designer
>>
>> Karl Bates
>> Senior PCB Designer
>><[log in to unmask]>
>> Northern Illinois IPC Designer Council President, Certified Designer
>> 2000 Naperville Rd.
>>Work: (630) 713-9853
>> Mail Stop IH2F105
>>Fax: (630) 713-4905
>> Naperville
>>Netscape Conference Address
>> Illinois
>>Netscape Conference DLS Server
>> 60566
>> U.S.A.
>> Lucent Technologies
>> Additional Information:
>> Last Name Bates
>> First Name Karl
>> Version 2.1
>
>
>
>--
>Lou Dallara Techno Visionary
>" Where there is no vision, the people perish."
>-- Proverbs 29:18
>http://www.waterwheel.net/~ldallara/arco_alumni/
>
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