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IC6 shielding constraint

stuso

Hi there, has anyone managed to use wire editor to route a shielded net in IC6? I'm having an issue setting up the constraint, specifically from this document:

 sourcelink.cadence.com/.../appA.html

and from that document:

 "To create a shielding constraint and set the associated shielding net:

Select the net that is to be shielded.

Note:  If you select multiple nets, and try to apply a Shielding constraint, a consistency check warning message is displayed in the CIW."

However i seem to be getting an error in my CIW when i do not select at least 2 nets:

*WARNING* Can not delete member GND from Shielding constraint Constr_0. Constraints of this type require at least 2 members.

 any suggestion/help is appreciated.

thanks

Stu

 

 

 

 

 

Parents

  •  Hi Stu,

     What version of Virtuoso are you using? This has changed recently and the document you are refering to shows the new use model. I'm not exactly sure when it changed, but it use to require to select in Navigator the shield net first, followed by shielded net (using ctrl to select both) before creating constraint in constraint manager. Give this a try.

    In either case, once the constrait is defined. Make sure you have CAE (Constraint-aware editing) ON. This is an option inthe menu Options->Layout XL...    "General" tab. You should see the shielding create when using Create->Wire... or running the autorouter.

    I just tried in ISR6 as described in doc. and works fine.

    Hope this helps,

    Fernando Torre

Reply

  •  Hi Stu,

     What version of Virtuoso are you using? This has changed recently and the document you are refering to shows the new use model. I'm not exactly sure when it changed, but it use to require to select in Navigator the shield net first, followed by shielded net (using ctrl to select both) before creating constraint in constraint manager. Give this a try.

    In either case, once the constrait is defined. Make sure you have CAE (Constraint-aware editing) ON. This is an option inthe menu Options->Layout XL...    "General" tab. You should see the shielding create when using Create->Wire... or running the autorouter.

    I just tried in ISR6 as described in doc. and works fine.

    Hope this helps,

    Fernando Torre

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