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The built-in layer constraint definition oacMinEnclosedArea specifies the minimum area in database units squared for an empty area that is enclosed by metal (that is, a donut hole formed by the metal). Enclosed areas are often associated with slotted metals or power grids.
This rule is generally used along with oacMinEnclosedSpacing, because although a hole might meet the minimum area requirement, it might not meet the minimum space requirement
| Constraint type: | oaLayerConstraint |
| Value types: | oaIntValue, oaInt1DTblValue |
| Database types: | oaDesign, oaTech |
| Object types: | oaAppObject |
The following value types are supported by this constraint:
This value represents the minimum area in database units squared
Units: DBU Square
The lookup key ("width") in the table represents the width of the enclosing metal, and the value for the table represents the minimum area.
Units: DBU Square
The primary reason for minimum enclosure rules is to avoid localized metal density problems that can occur during etching and create an undesired pattern.
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