minProtrusionWidth

Specifies the minimum width for a protrusion that connects to a wire based on the length of the protrusion and the width of the wire it connects to. The following must be true for the constraint to apply:

• The protrusion must connect to a wire.
• The length of the protrusion must be less than the protrusionLength in the constraint specification.
• The width of the wire the protrusion connects to must be less than or equal to the wireWidth in the constraint specification.

minProtrusionWidth Quick Reference

Value Type

minProtrusionWidth constraints have a Value that represents the minimum width, in user units, for the protrusion to apply when the criteria is met.

set_constraint_parameter -name width -Value f_wireWidth
set_constraint_parameter -name length -Value f_protrusionLength
set_layer_constraint -constraint minProtrusionWidth \
 -layer s_layer -Value f_protrusionWidth

LAYER s_layer
 TYPE ROUTING ;
 PROTRUSIONWIDTH width1 LENGTH length WIDTH width2 ;

spacings(
( protrusionWidth tx_layer 
  ( g_protrusionLength g_wireWidth g_protrusionWidth ) )
)

Parameters

• width (Value) is the minimal width, in user units, of the wide wire for the constraint to apply.
• length (Value) is the length, in user units, that the protrusion length must be less than for the constraint to apply.

Examples

This example sets the minimum protrusion width to 0.25 on Metal3 protrusions on that meet the following requirements:

• Have a length shorter than 1.5 user units.
• Connect to a wire with a width greater than or equal to 0.5.
  
  

  Format	Example
  Tcl	set_constraint_parameter -name width -Value 0.5 set_constraint_parameter -name length -Value 1.5 set_layer_constraint -constraint minProtrusionWidth \ -layer Metal3 -Value 0.25
  LEF	LAYER Metal3 TYPE ROUTING ; PROTRUSIONWIDTH 0.5 LENGTH 1.5 WIDTH 0.25 ;
  Virtuoso	spacings( (protrusionWidth "Metal3" (1.5 0.5 0.25) )

Related Topics

Length and Width Constraints