minDualEndOfLineExtension

Some processes need to specify an end-of-line enclosure rule that applies only if no shapes on other nets lie in the rectangular regions around the side and end of the line. The two-layer minDualEndOfLineExtension specifies the extension of the first layer (layer1) beyond a shape on the second layer (layer2). The second layer is expected to be a cut layer.

This constraint is not symmetric.

minDualEndOfLineExtension Quick Reference

Value Types

minDualEndOfLineExtension constraints have a DualValue. The first value is the extension, in user units, of layer1 beyond layer2 at the end-of-line (eolExtension). The same extension is also required on the opposite side of the layer2 shape. The second value is the extension, in user units, of layer1 beyond layer2 on either side (otherExtension).

Parameters

• width (Value, required) specifies that the constraint only applies if the width of the end-of-line is less than this value.
• length (Value, optional) specifies that the constraint only applies if the length of the end-of-line is greater than or equal to this value.
• endOfLineOnly (BoolValue, optional) If set true for a given constraint, it should be true for all minDualEndOfLineExtension constraints for the same cutClass and layer pair. If only one constraint has the endOfLineOnly parameter, that constraint should be observed and the others ignored. If this parameter is true, then for all end-of-line edges, only minDualEndOfLineExtension constraints must be satisfied; any other enclosure type rules for that layer pair/cut class, such as minDualExtension, can be ignored.
• cutClass (DualValue, optional) identifies the cut class to which the constraint applies given the cut width and height.
• endExclusionArea (DualValue, optional) specifies that the constraint only applies if there are no different-net neighbors in the rectangular area at the end of the line. The first value is the distance on either side of the line end (endPerpendicularExclusion); the second value is the distance past the end-of-line (endExclusion) shown in Figure .
• sideExclusionArea (ValueArrayValue, optional) specifies an exclusion area at either side of the line. The area is defined by three Values—sideEdgeExclusion, backwardExclusion, and forwardExclusion—shown in Figure . The constraint only applies if there is no different-net neighbor shape in that region.
• shortEdgeOnEol (BoolValue, optional) When set to true, specifies that the first value (eolExtension) must be applied to the end/short edges of the cut and the second value (otherExtension) must be applied to the long sides of the cut. This parameter must be used with the cutClass parameter for rectangular cut vias.

Examples

Example 1—minDualEndOfLineExtension with endExclusionArea and sideExclusionArea

In this example, an Metal1 or Metal2 extension of 0.1 μm on all sides of a V1 cut is required. However, if the cut is on an end-of-line, then an extension of 0.15 μm is required to the end-of-line edge and on the opposite side of the cut, and 0.05 μm is required on the sides of the cut if there are no neighbor wires within 0.04 μm of the line side edges with back and forward exclusion extensions of 0.03 μm or within 0.08 μm of the end-of-line edge with a perpendicular extension of 0.06 μm to the sides.

set_layerpair_constraint -constraint minDualExtension -layer1 Metal1 -layer2 V1 -DualValue {0.1 0.1}

set_layerpair_constraint -constraint minDualExtension -layer1 Metal2 -layer2 V1 -DualValue {0.1 0.1}

set_constraint_parameter -name width -Value 0.2
set_constraint_parameter -name endExclusionArea -DualValue {0.08 0.06}
set_constraint_parameter -name sideExclusionArea -ValueArrayValue {0.04 0.03 0.03}
set_layerpair_constraint -constraint minDualEndOfLineExtension \
  -layer1 Metal1 -layer2 V1 -DualValue {0.15 0.05}

set_constraint_parameter -name width -Value 0.2
set_constraint_parameter -name endExclusionArea -DualValue {0.08 0.06}
set_constraint_parameter -name sideExclusionArea -ValueArrayValue {0.04 0.03 0.03}
set_layerpair_constraint -constraint minDualEndOfLineExtension \
  -layer1 Metal2 -layer2 V1 -DualValue {0.15 0.05}

ENCLOSURE 0.1 0.1

PROPERTY LEF58_ENCLOSURE
"ENCLOSURE EOL 0.2 0.15 0.05 SIDESPACING 0.04 EXTENSION 0.03 0.03 ; 
 ENCLOSURE EOL 0.2 0.15 0.05 ENDSPACING 0.08 EXTENSION 0.06 ; " ;

orderedSpacings(
( minOppExtension "Metal1" "V1"  (0.1 0.1))

( minOppExtension "Metal2" "V1"  (0.1 0.1))

( minOppEndOfLineExtension "Metal1" "V1"
  'width 0.2
  'endExclusion  (0.08 0.06)
  'sideExclusion (0.04 0.03 0.03)
  (0.15 0.05))

( minOppEndOfLineExtension "Metal2" "V1"
  'width 0.2
  'endExclusion  (0.08 0.06)
  'sideExclusion (0.04 0.03 0.03)
  (0.15 0.05))

) ;orderedSpacings

Example 2—minDualEndOfLineExtension with shortEdgeOnEol

In this example, the end/short edge of a VB cut (0.04 x 0.08 rectangular cut) on cut layer V1 must have a Metal1 or Metal2 extension of 0.05 user units and the long sides must have an extension of 0.04 user units.

set_constraint_parameter -name width -Value 0.2
set_constraint_parameter -name cutClass -DualValue {0.04 0.08}
set_constraint_parameter -name shortEdgeOnEol -BoolValue true
set_layerpair_constraint -constraint minDualEndOfLineExtension \
  -layer1 Metal1 -layer2 V1 -DualValue {0.05 0.04}

set_constraint_parameter -name width -Value 0.2
set_constraint_parameter -name cutClass -DualValue {0.04 0.08}
set_constraint_parameter -name shortEdgeOnEol -BoolValue true
set_layerpair_constraint -constraint minDualEndOfLineExtension \
  -layer1 Metal2 -layer2 V1 -DualValue {0.05 0.04}

PROPERTY LEF58_ENCLOSURE 
"ENCLOSURE CUTCLASS VB EOL 0.2
     SHORTEDGEONEOL 0.05 0.04 ;" ;

orderedSpacings(
( minOppEndOfLineExtension Metal1 V1
  'width 0.2
  'cutClass 0.04 0.08
  'shortEdgeOnEol
  0.05 0.04)
( minOppEndOfLineExtension Metal2 V1
  'width 0.2
  'cutClass 0.04 0.08
  'shortEdgeOnEol
  0.05 0.04)
) ;orderedSpacings

Related Topics

Extension Constraints

check_extension