trimShape

Determines how shapes are formed on a trim metal layer at the line-ends of wires.

Shapes are always formed at the line-ends of wires.

trimShape Quick Reference

Constraint Type	Layer
Value Types	IntValue
Database Types	Design, Technology
Scope	design, foundry
Category	Miscellaneous

Value Type

IntValue

Specifies the extension model. Valid Values: 0 Shapes extend to the centerline of adjacent tracks (adjacentTrack). 1 Shapes extend by half of the required spacing of the wires (midTrack). 2 Shapes extend by the specified value (edgeExtension) on either side from the center (extension).

Required Parameter

exactWidth

Specifies that the width of the shape formed on the trim metal layer must be equal to this value. Type: Value

Optional Parameters

maxLength	Specifies that the length of the shape formed on the trim metal layer must be less than or equal to this value. Type: Value
exceptSpacing	Specifies that no shape is formed on the trim metal layer if the spacing between the line-ends of two wires is greater than or equal to this value. Type: Value
exceptWidth	Specifies that no shape is formed on the trim metal layer if the width of the line-end of a wire is greater than this value. Type: Value
edgeExtension	Specifies that the trim metal shape must extend by this value on either side from the center of the metal that it trims. This parameter should be used only when the constraint value is 2 (extension). Type: Value
metalEdge	Specifies that the trim metal shape must extend from the edges of the metal that it trims. This parameter should be used only when edgeExtension is specified. Type: BoolValue

Examples

Example 1: trimShape with adjacentTrack

Specifies that the width of each TrimMetal1 shape must be equal to 0.02 and the TrimMetal1 shapes must extend to the centerline of adjacent tracks (adjacentTrack). No TrimMetal1 shape is formed if the spacing between line-ends of two wires is greater than or equal to 0.03.

set_constraint_parameter -name exactWidth -Value 0.02
set_constraint_parameter -name exactSpacing -Value 0.03
set_layer_constraint -constraint trimShape -layer TrimMetal1 -IntValue 0

Example 2: trimShape with midTrack

Specifies that the width of the TrimMetal1 shapes must be equal to 0.02 and the TrimMetal1 shapes must extend by half of the required spacing of the wires (midTrack). No TrimMetal1 shape is formed if the spacing between line-ends of two wires is greater than or equal to 0.03.

set_constraint_parameter -name exactWidth -Value 0.02
set_constraint_parameter -name exactSpacing -Value 0.03
set_layer_constraint -constraint trimShape -layer TrimMetal1 -IntValue 1

Example 3: trimShape with edgeExtension and extension

Specifies that the width of each TrimMetal1 shape must be equal to 0.02 and it must extend by 0.05 on either side from the center of the metal that it trims.

set_constraint_parameter -name exactWidth -Value 0.02
set_constraint_parameter -name edgeExtension -Value 0.05
set_layer_constraint -constraint trimShape -layer TrimMetal1 -IntValue 2

Example 4: trimShape with edgeExtension, metalEdge, and extension

Specifies that the width of each TrimMetal1 shape must be equal to 0.02 and it must extend by 0.05 on either side from the metal edges that it trims.

set_constraint_parameter -name exactWidth -Value 0.2
set_constraint_parameter -name edgeExtension -Value 0.5
set_constraint_parameter -name metalEdge -BoolValue true
set_layer_constraint -constraint trimShape -layer TrimMetal1 -IntValue 2

Related Topics

Miscellaneous Constraints

check_space

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