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This constraint specfies spacing ranges for the clearance between a gate and neighboring poly shapes. In addition, it is okay to violate the rule if a poly shape on one side of the gate comes =< a certain percentage P% of the gate width.
In the example shown below, one of the gate's width is indicated as L. To the left of the gate is a poly extension that is L1 shorter than the device gate. If L1/L<P% then the rule may be ignored. Similarly, if L2/La<P% or L3/Lb<P% the rule may be ignored.
| Constraint type: | oaLayerConstraint |
| Value types: | oaIntRangeArrayValue |
| Database types: | oaDesign, oaTech |
| Object types: | oaAppObject |
The following value types are supported by this constraint:
The maximum length, indexed by width.
Units: DBU
The following parameters are supported by this constraint:
| Name | Value Type | Units | Default | Description |
|---|---|---|---|---|
| minLengthRatio oacMinLengthRatioConstraintParamType |
oaFltValue | Percent | (Required) |
The minLengthRatio (oaFloatValue) parameter is used to indicate the allowed ratio. The rule does not apply for ratios less than those indicated by the parameter. |
| maxChannelLength oacMaxChannelLengthConstraintParamType |
oaIntValue | DBU | None |
This rule may apply only to gates up to a certain gate shape width (channel length). The maxChannelLength (oaIntValue) parameter is used to indicate the maximum channel length. |
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