minConvexEdgeLength

Specifies the minimum edge length for an edge that is in a convex corner of a shape on the layer.

minConvexEdgeLength Quick Reference

Constraint Type	Layer
Value Types	Value
Database Types	Design, Technology
Scope	design, foundry
Category	Length and Width

Value Type

The minConvexEdgeLength constraint has a Value that is the minimum edge length, in user units, for an edge that is in a convex corner of a shape on the layer.

Parameter

• lengthSum (Value, optional) specifies that the constraint does not apply if the sum of consecutive edges that are shorter than the minimum edge length value is less than the value of this parameter.

Examples

This example sets the minimum outside corner edge length on Metal2 to 0.05 and the maximum edge length sum to 0.15. The results of the specified constraint on shapes in Concave and Convex Edge Examples are:

• Shape a is legal because its consecutive edges are less than 0.05 μm, and the total length of the edges is less than or equal to 0.15 μm.
• Shape d is a violation because even though its consecutive edges are less than 0.05 μm, the total length of the edges is greater than 0.15 μm.
• Shapes b, c, e, and f do not have outside corners to check.
  

  Format	Example
  Tcl	set_constraint_parameter -name lengthSum -Value 0.15 set_constraint -layer Metal2 -constraint minConvexEdgeLength \ -Value 0.05
  LEF	MINSTEP 0.05 OUTSIDECORNER LENGTHSUM 0.15;
  Virtuoso	spacings( (minOutsideCornerEdgeLength "Metal2" (0.15 0.05)) )

Related Topics

Length and Width Constraints

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