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Creating an automatic via

Siddique baig

Hi All,

 I am using Cadence Virtuoso Layout Suite 6.1.5 version. I want to create an automatic via between two metal layers when I click upon their overlap. 

I already know auto via. This creates the via on the overlap of 2 metal layers. For example, if metal layers are M1 and M2, it creates V1 (via between M1 and M2) contacts according to the area of overlap. But, the disadvantage of this approach is the spacings between two V1's will be minimum and defined by the technology library. If minimum spacing between two V1s is 0.26, the auto via will create V1 contacts with spacing as 0.26. 

In one application, I need the spacing between two vias as 0.3 (i.e. higher than minimum 0.26) and I want to use auto via. Is there any way to do this with Virtuoso? (Skill code is also ok)

 Thanks in Advance!

Thanks,

Baig.

Parents

  • Baig,

    You could create a new constraint group with different viaSpacing rules either stored in your design or in your library (if the library was created using "Reference" rather than "Attach", you can extend it using the ITDB (Incremental Technology DataBase) mechanism). This can be done interactively with the Process Rule Editor which is part of the Constraint Manager.

    Having created the constraint group, you can tell it to use this constraint group for Vias via the Options->Editor Options form.

    Regards,

    Andrew.

Reply

  • Baig,

    You could create a new constraint group with different viaSpacing rules either stored in your design or in your library (if the library was created using "Reference" rather than "Attach", you can extend it using the ITDB (Incremental Technology DataBase) mechanism). This can be done interactively with the Process Rule Editor which is part of the Constraint Manager.

    Having created the constraint group, you can tell it to use this constraint group for Vias via the Options->Editor Options form.

    Regards,

    Andrew.

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