minClusterClearance

Specifies the minimum clearance between a group of aligned shapes and another shape on a different layer. The constraint specifies several conditions for the neighboring shapes to be considered as a valid group of shapes.

minClusterClearance Quick Reference

Constraint Type	Layer pair (non-symmetric)
Value Types	Value
Database Types	Design, Technology
Scope	design, foundry
Category	Clearance

Value Type

Value

Specifies the minimum clearance between the cluster and the other shape.

Required Parameters

The conditions specified by the following parameters must be satisfied for a cluster to be a valid cluster:

shapeWidthRange	Specifies that a valid cluster is only formed using shapes with widths in this range. Type: RangeValue
numShapesRange	Specifies that a valid cluster is only formed if the number of shapes in the cluster are in this range. Type: RangeValue
spacingRange	Specifies that a valid cluster is only formed if the neighboring shapes in a cluster are within this centerline spacing range. Type: RangeValue

Optional Parameters

groupDirection	Specifies that the groups can only be formed in the given direction. Type: IntValue 0 anyDirection (horizontally and vertically, default) 1 horizontalDirection (horizontally only) 2 verticalDirection (vertically only)
centerLineDistance	Specifies that the spacing measurement is done from the centerline of the cluster to the centerline of another shape. If this parameter is false, the spacing measurement is done from the edge of the cluster to the edge of another shape. Note: The intra-cluster spacing (specified by the parameter spacingRange) is always measured centerline. Type: BoolValue
oaSpacingDirection	Specifies the measurement direction. Type: StringAsIntValue anyDirection 0 Horizontally and vertically (default) horizontalDirection 1 Horizontally only verticalDirection 2 Vertically only
otherWidthRange	Specifies that the constraint applies if the width of the other shape is in this range. Type: RangeArrayValue
parallelRunLength	Specifies that the constraint applies only if the parallel run length between the cluster and the other shape is equal to or greater than this value. Type: Value

Examples

Example 1: minClusterClearance example

The minimum clearance between the cluster on Metal1 and the other shape on Metal2 must be greater than or equal to 3 user units under the following conditions:

• The width of the shapes in the cluster on Metal1 are greater than or equal to 3 and less than or equal to 5.
• The width of the other shape on Metal2 is greater than 5 and less than 7.
• The centerline spacing between the shapes in the cluster is greater than 3 and less than 6.
• The number of shapes in the cluster is greater than or equal to 3 and less than or equal to 5.

set_constraint_parameter -name shapeWidthRange -RangeValue {"[3 5]"}
set_constraint_parameter -name otherWidthRange -RangeValue {"(5 7)"}
set_constraint_parameter -name spacingRange -RangeValue {"(3 6)"}
set_constraint_parameter -name numShapesRange -RangeValue {"[3 5]"}
set_layerpair_constraint -constraint minClusterClearance -Value 3 \
-layer1 Metal1 -layer2 Metal2

Example 2: minClusterClearance using centerLineDistance

set_constraint_parameter -name shapeWidthRange -RangeValue {"[3 5]"}
set_constraint_parameter -name otherWidthRange -RangeValue {"(5 7)"}
set_constraint_parameter -name spacingRange -RangeValue {"(3 6)"}
set_constraint_parameter -name numShapesRange -RangeValue {"[3 5]"}
set_constraint_parameter -name centerLineDistance -BoolValue true
set_layerpair_constraint -constraint minClusterClearance -Value 7 \
  -layer1 Metal1 -layer2 Metal2

The minimum clearance between the cluster on Metal1 and the other shape on Metal2 must be greater than or equal to 7 user units under the following conditions:

• Widths of shapes in the Metal1 cluster are greater than or equal to and less than or equal to 5.
• Width of Metal2 shape is greater than 5 and less than 7.
• Centerline spacing between the shapes in the cluster is greater than 3 and less than 6.
• Number of shapes in the cluster is greater than or equal to 3 and less than or equal to 5.
• Clearance measured between the centerline of the cluster and the centerline of another shape.
  
  Illustration for minClusterClearance using centerLineDistance
  

Example 3: minClusterClearance using groupDirection

The minimum clearance between the cluster on Metal1 and the other shape on Metal2 must be greater than or equal to 5µm under the following conditions:

• Width of shapes in the Metal1 cluster are greater than or equal to 3 and less than or equal to 5.
• Width of the other shape on Metal2 is greater than 5 and less than 7.
• Centerline spacing between shapes in the cluster is greater than 3 and less than 6.
• Number of shapes in the cluster is greater than or equal to 3 and less than or equal to 5.
• The groups are formed in the vertical direction.

set_constraint_parameter -name shapeWidthRange -RangeValue {"[3 5]"}
set_constraint_parameter -name otherWidthRange -RangeValue {"(5 7)"}
set_constraint_parameter -name numShapesRange -RangeValue {"[3 5]"}
set_constraint_parameter -name spacingRange -RangeValue {"(3 6)"}
set_constraint_parameter -name groupDirection -IntValue 2
set_layerpair_constraint -constraint minClusterClearance -Value 5 \
  -layer1 Metal1 -layer2 Metal2

Related Topics

Clearance Constraints

check_layerpair_space

minClusterSpacing

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