minEnclosedArea

Specifies the minimum area for a hole, or an empty area, that is enclosed by metal. This constraint is often used in conjunction with the minEnclosedSpacing constraint for slotting.

minEnclosedArea Quick Reference

Constraint Type	Layer
Value Types	AreaValue, OneDTblValue
Database Types	Design, Technology
Scope	design, foundry
Category	Area

Value Types

AreaValue	Specifies the minimum area allowed for a hole in the specified layer.
OneDTblValue	Specifies the minimum hole area that is dependent on the effective width of the shapes surrounding the hole. The effective width is the smaller dimension of the surrounding rectangles.

Examples

• Fixed Value
  Sets the minimum hole area on Metal1 to 1.0 user unit.

  set_layer_constraint -constraint minEnclosedArea -layer Metal1 -AreaValue 1.0

• 1D Table: Index width
  Establishes a lookup table to set the minimum allowed area for a hole on Metal1, based on the width of the enclosing metal.
  For example, when the width of enclosing metal on Metal1 is greater than or equal to 0.0005, but less than 0.5605, the minimum hole area is 0.12; when the width is greater than or equal to 0.5605, but less than 1.5005, the minimum hole area is 0.18.

  set_layer_constraint -constraint minEnclosedArea -layer Metal1 \
    -row_name width \
    -OneDTblValue {0.0005 0.12 0.5605 0.18 1.5005 0.5 3.0005  0.9}

Related Topics

Area Constraints

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