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Routing Layers in Cadence Virtuoso

growingmind

Hello,

I am using Cadence Virtuoso 1.6.4.

In the newer versions of Virtuoso, there is an option in the LSW for Layout where you can select only the routing layers.

Are the routing layers basically the metal layers - ie. M1, M2 etc in the PDK ?

I want to use this feature in the older version of Virtuoso I have so I wanted to check what this function did.

Thanks.

  • There isn't really a direct equivalent in the old IC6.1.4 LSW. You could use (say) Edit->Filter Layers and then pick just "Layers with functions" and check just cut, poly, metal. You might also just want to include purposes beginning with "drw" to get the drawing purposes only (maybe pin as well?).

    From the Palette documentation in IC617, it says:

    • Routing: If selected, displays only the routing layers.
      Routing layers are identified at the start of a Virtuoso session. By default, the following layers are identified as routing layers:
      • All layers with function metal, cut, and poly and purpose drawing through drawing9
        Note:
        You can exclude cut layers from routing layers by using the pteIncludeCutLayers environment variable. The value of this variable must be set before opening a design. Once set, it is applicable for the entire session.
      • All layers with purpose drawing through drawing9 present in the validRoutingLayers constraint
      • All combinations of the layers and purposes present in the validRoutingLPPs constraint

    So my suggestion of using the filter to filter for functions seems reasonable.

    Regards,

    Andrew

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