Re: .EBD question

Hi Mike, all,

Thanks for the reply.

  Unless some disagrees I would like to consider a Bird to
correct this problem.
The problem I see is that the node property can not be
anything other than a component. We could add another
property that is a non-component interconnect and fix this.

best wishes...
Kellee

At 01:16 PM 12/18/98 -0500, you wrote:
>Kellee,
>
>The Fork/Endfork notation implements what is commonly called a
>Directed Acyclic Graph. The key term here is "acyclic", meaning
>you can not have loops. Notations that allow loops, like SPICE,
>almost always do so by naming the nodes so that multiple references
>into a node are accepted.
>
>Mike LaBonte
>Cadence Design Systems
>
>Kellee Crisafulli wrote:
>>
>> Hello Ibisians,
>>
>> This came up in a conversation recently and I did not
>> know the answer.
>> How do you describe a loop in a trace layout with the
>> [Path Description] in a .EBD file?
>>
>> For example:
>> Pin 1
>> *
>> *
>> ****
>> * *
>> ****
>> *
>> *
>> Pin 2
>>
>> [Path Description] LOOP
>> Pin 1
>> Len = 1.0 L = 1.0n C= 2.0p /
>> Fork
>> Len = 1.0 L = 1.0n C= 2.0p /
>> Len = 1.0 L = 1.0n C= 2.0p /
>> Len = 1.0 L = 1.0n C= 2.0p
>> Endfork
>> |
>> |now what do I do to close the loop?
>> |
>> Len = 1.0 L = 1.0n C= 2.0p /
>> Pin 2
>>
>> ---------------------------------------------------------
>> Have a great day....
>> Kellee Crisafulli at HyperLynx
>> SI,EMC,X-talk and IBIS tools for the Windows platform
>> E-mail: <mailto:kellee@hyperlynx.com>
>> web: <http://www.hyperlynx.com>
>> ---------------------------------------------------------
>
Received on Fri Dec 18 11:05:28 1998