minProtrudedProximitySpacing

Sets the minimum spacing between a protrusion from a wide wire and shapes that fall within a specified distance of a shape of a specified width. The protrusion contributes to the proximity halo of the larger shape. The smaller shapes effectively pick up the spacing required by the wider shape.

minProtrudedProximitySpacing and minProximitySpacing are mutually exclusive. If both are specified, then only minProtrudedProximitySpacing is honored.

minProtrudedProximitySpacing Quick Reference

Value Types

minProtrudedProximitySpacing constraints have the following value types:

• Value
  Specifies the minimum spacing, in user units, required between the protrusion and the small geometry. This value type is not currently supported by Space-based Router and Chip Optimizer functions.
• OneDTblValue
  The table values represent the minimum spacing, in user units, required between the protrusion and the small geometry, based on the row lookup key (width) for the width of the large influencing shape. The width of the shape is defined as the smaller of the shape’s two dimensions. This value type is not currently supported by Space-based Router and Chip Optimizer functions.
• TwoDTblValue
  The table values represent the minimum spacing, in user units, required between the protrusion and the small geometry, based on the row lookup key (width) for the width of the large influencing shape, and the column lookup key (distance) that represents the distance between the small shape and the large influencing shape.

To use this constraint with VirtuosoSpace-basedRouter functions, minSpacing must also be set to a OneDTblValue or TwoDTblValue.

set_layer_constraint -constraint minProtrudedProximitySpacing \
 -layer s_layer -row_name width -col_name length \
 -TblCols {f_distance…}  -TwoDTblValue {{f_width f_space}…}

Examples

This example sets the minProtrudedProximitySpacing constraint.

set_layer_constraint -layer Metal2 
  -constraint minProtrudedProximitySpacing -hardness hard \
  -row_name width -col_name distance \
  -TblCols { 0.15 } \
  -TwoDTblValue { 0.299 0.15 }  \
  -row_interpolation snap_down_inclusive \
  -row_extrapolation {snap_down snap_down} \
  -col_interpolation snap_down_inclusive \
  -col_extrapolation {snap_up snap_down}

SPACING 0.15 RANGE 0.299 10000 INFLUENCE 0.15 ;

( minStubInfluenceSpacing "Metal2"
  (( "width" nil nil "distance" nil nil ) )
   (
   (0.299  0.15 ) 0.15
   )
   )

Related Topics

Spacing Constraints