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The built-in layer pair constraint definition oacViaStackingAllowed specifies whether or not you can stack the two cut layers. The oacViaStackingAllowed constraint should be specified for cut layers only. A via is considered to be in a stack with another via if the cut of one via overlaps any part of the cut of the other via.
This constraint definition is symmetric, implying that when via stacking is allowed for layer1 and layer2, it is also allowed for layer2 and layer1.
| Constraint type: | oaLayerPairConstraint (Symmetric: yes) |
| Value types: | oaBooleanValue |
| Database types: | oaDesign, oaTech |
| Object types: | oaRoute, oaScalarNet, oaBusNetBit, oaAppObject |
The following value types are supported by this constraint:
This oaBooleanValue indicates whether or not via stacking is allowed. If the value is true, then via stacking is allowed for the two layers. If false, then via stacking is not allowed for the two layers.
Units: Boolean
Processes with good planarization techniques allow via stacking. If good planarization techniques are not used, geometries are bumpy and you cannot get reliable connections.
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