orthogonalSnappingLayer

Specifies the stopping points to align end-of-line edges on layer1 with the routing grid on layer2, based on the widths of the routing tracks. The routing grid on layer2 can be specified using a number of ways, including track patterns, snapPatternDefs, and widthSpacingSnapPatternDefs. Both layers must have orthogonal direction.

orthogonalSnappingLayer Quick Reference

Constraint Type	Layer-pair (non-symmetric)
Value Types	`RangeArray1DTblValue`
Database Types	Design, Technology
Scope	design, foundry
Category	Routing

Value Type

RangeArray1DTblValue

Specifies the stopping points to align end-of-line edges on layer1 with the routing grid on layer2, based on the widths of the routing tracks.

Required Parameters

None

Optional Parameters

upperLineEndStoppingPoints

Specifies in user units the stopping-point distances for the right and upper edges of the shapes on layer1; the constraint value specifies the stopping point distances for the left and lower edges of the shapes on layer1.

If this parameter is not specified, the constraint value applies to all edges, lower and left and upper and right.

Type: RangeArray1DTblValue

Examples

set_layerpair_constraint -layer1 Metal2 -layer2 Metal3 \
  -constraint orthogonalSnappingLayer -row_name width \
  -RangeArray1DTblValue {0.0    1   0 \
                         0.02   3   -0.05  0  0.1}

Specifies that the end-of-line edges of Metal2 shapes must stop as follows:

At a distance equal to 0 from the centerline of the track if the width of a routing track on Metal3 is greater than or equal to 0.0.
At a distance equal to -0.05, 0, or 0.1 from the centerline of the track if the width of a routing track on Metal3 is greater than or equal to 0.02.

The table is indexed by track width. Each row contains a track width, the count of RangeArrayValue for the given track width, and the RangeArrayValue list that specifies the allowed stopping-point distances.

Illustration for orthogonalSnappingLayer

Virtuoso Space-based Router Constraint Reference
Product Version IC23.1, June 2023