---

Contents

---

1

Manage Constraints

Constraint Value Types

Table Values in Constraints

Interpolation and Extrapolation Techniques

Interpolation Techniques

Extrapolation Techniques

Range Values

Constraint Objects

Custom Constraints Definition

Constraints Setting

Constraint Values Retrieval

Constraints Removal

Constraint Parameters

Constraint Parameters Setting

Constraint Groups and Multispecs

Constraint Group Types

TransReflexive, Reflexive, and InterChild Constraint Groups

Simplified Constraint Search Hierarchy

Rule Spec Hierarchy

Object Hierarchy

Specialty Routing Constraints

Taper Constraints

Shield Constraints

Bus, Net Pair, and Matched Length Nets Constraints

Constraint Group Operators

Applying Constraints to Objects

Advanced Nodes Constraints

Multi-patterning (MPT) Constraints

Layer-Purpose Pair Constraints

Voltage-Dependent Rule Support

Layer Purpose Pair VDR Support

Net-based VDR Support

Euclidean and Manhattan Spacing Constraints

Constraints Summary

Constraint Definitions

Quick Reference Table

2

Tcl Constraint Commands

add_constraint_group

append_group

assign_constraint_group

assign_group_group

check_constraint_def

constraint_group_exists

copy_constraint

create_constraint_group

create_group

create_via_variant

define_constraint

destroy_constraint_group

destroy_unused_netoverride_groups

dump_ctu_constraints

dump_oa_constraints

get_constraint

get_constraint_group

get_foundry_override

get_layer_constraint

get_layerarray_constraint

get_layerpair_constraint

get_override_rulespec

remove_constraint_group

report_group

set_constraint

set_constraint_def_check

set_constraint_group

set_constraint_parameter

set_default_constraint_group

set_foundry_override

set_layer_constraint

set_layerarray_constraint

set_layerpair_constraint

set_net_voltage

set_override_rulespec

unassign_constraint_group

unassign_group_group

undefine_constraint

unset_constraint

unset_foundry_override

unset_layer_constraint

unset_layerarray_constraint

unset_layerpair_constraint

unset_override_rulespec

3

Antenna Constraints

antenna

antennaMetalAreaFactor

antennaMetalCutBelowAreaFactor

antennaMetalDiodeAreaFactor

antennaMetalGateAreaFactor

antennaMetalMinusDiodeAreaFactor

antennaViaAreaFactor

antennaViaDiodeAreaFactor

antennaViaGateAreaFactor

cumulativeDAR

cumulativeGAR

cumulativeMetalAntenna

cumulativeSideWall

cumulativeViaAntenna

cumulativeViaDAR

cumulativeViaGAR

cumulativeViaSideWall

diodeAreaRatio

gateAreaRatio

maxFloatingArea

sideWall

validAntennaDiodes

validFillerCells

4

Area Constraints

minArea

minAreaEdgeLength

minEnclosedArea

oaMinRectArea

5

Clearance Constraints

maxClearance

minCenterLineClearance

minClearance

minClearanceOverLayer

minClusterClearance

minCornerClearance

minCutRoutingClearance

minInnerVertexClearance

minNeighboringShapesClearance

minSameNetClearance

minSideClearance

minTouchingDirectionClearance

minVoltageClearance

shapeRequiredClearance

6

CMP Constraints

CMPAnalysisGrid

CMPRegionHalo

maxDensityGradient

maxOxideCopperStepHeight

maxSurfaceHeightRange

maxThicknessGradient

maxThicknessGradientPercent

maxThicknessThreshold

maxThicknessThresholdPercent

minDensityGradient

minThicknessGradient

minThicknessGradientPercent

minThicknessThreshold

minThicknessThresholdPercent

7

Density Constraints

densityFillKeepout

maxDensity

maxDiffDensity

maxInterLayerDensityGradient

minDensity

minDensityHole

minFillPatternSpacing

minFillToFillSpacing

minPgFillBoundarySpacing

minPgFillClockSpacing

minPgFillFloatingFillSpacing

minPgFillPgSpacing

minPgFillSignalSpacing

minPgFillSpacing

8

Extension Constraints

maxExtension

minBoundaryExtension

minCenterLineExtension

minConcaveCornerExtension

minDualEndOfLineExtension

minDualExtension

minEndOfLineExtension

minEndOfLineEdgeExtension

minExtension

minExtensionEdge

minExtensionOnLongSide

minExtensionToCorner

minInnerVertexProximityExtension

minNeighborExtension

minQuadrupleExtension

minSideExtension

minTouchingDirectionExtension

minViaJointExtension

minWireExtension

oaDummyPolyExtension

9

Length and Width Constraints

allowedBoundaryDimensions

allowedLengthRange

allowedNeighborDiffLayerWidthRange

allowedNeighborOverLayerWidthRange

allowedNeighborWidthRange

allowedWidthRange

discreteWidth

effectiveWidth

maxDiagonalEdgeLength

maxDiffusionLength

maximumLength

maxJogLength

maxWidth

minBumpoutEdgeLength

minConcaveEdgeLength

minConvexEdgeLength

minDiagonalEdgeLength

minDiagonalWidth

minEdgeAdjacentDistance

minEdgeLength

minEdgeMaxCount

minEndOfLineAdjacentToStep

minimumLength

minJogLength

minPerimeter

minProtrusionWidth

minSize

minWidth

oaMinEdgeAdjacentLength

pgFillWidth

10

Miscellaneous Constraints

allowedWireTypes

diagonalShapesAllowed

edgeMustCoincide

errorLayer

minOneDArrayStructure

oaGateOrientation

rectangularShapeDirection

trimShape

useExistingShapesAsShield

11

Mixed-Signal Routing Constraints

crossTalkNeighborIndex

gapSpace

horizontalSymmetryLine

ignoreShieldingOnLayers

isDriver

lengthPatternAccordion

lengthPatternDangle

lengthPatternEndRun

lengthPatternOff

lengthPatternRWAccordion

lengthPatternTrombone

matchTolerance

maxClusterDistance

maxCouplingDiff

maxCouplingDiffPercent

maxGroundCapDiff

maxGroundCapDiffPercent

maxSingleCoupling

maxSingleCouplingPercent

minCoupling

minCouplingPercent

msConnectSupplyDistance

msMatchPerLayer

msMaxCap

msMaxRes

msMaxWidth

msMinCap

msMinLengthPatternPitch

msMinRes

msSameMask

msShieldStyle

msTolerance

numStrands

routeMaxLength

routeMinLength

shareShields

strandSpacing

strandWidth

tandemLayerAbove

tandemLayerBelow

tandemWidth

verticalSymmetryLine

Obsolete Mixed-Signal Routing Tcl Constraints

12

NumCut Constraints

minNumCut

minProtrusionNumCut

13

Overlap Constraints

edgeMustOverlap

minConcaveCornerOverlap

minDirectionalOverlap

minOverlap

minWireOverlap

14

Placement and Alignment Constraints

horizontalPlacementGridOffset

horizontalPlacementGridPitch

keepAlignedShapeAndBoundary

keepAlignedShapes

verticalPlacementGridOffset

verticalPlacementGridPitch

15

Routing Constraints

135RouteGridOffset

135RouteGridPitch

45RouteGridOffset

45RouteGridPitch

clusterDistance

cutClassPreference

defaultHorizontalRouteGridOffset

defaultHorizontalRouteGridPitch

defaultMfgGrid

defaultVerticalRouteGridOffset

defaultVerticalRouteGridPitch

extendedValidRoutingVias

horizontalRouteGridOffset

horizontalRouteGridPitch

inlineViaPreferred

layerHeight

layerThickness

limitRoutingLayers

limitViaThruLayers

maxPickupDistanceAllowed

maxRoutingDistanceAllowed

maxTaperWindow

mfgGrid

minTaperWindow

nearFarPercentage

oaDefault135RouteGridOffset

oaDefault135RouteGridPitch

oaDefault45RouteGridOffset

oaDefault45RouteGridPitch

oaPreferredRoutingDirection

oaTaperHalo

offset

orthogonalSnappingLayer

planarTapAllowed

preferredExtensionDirection

preferredViaOrigin

routeOnGrid

taperToFirstVia

TJunctionAllowed

validRoutingLayers

validRoutingVias

validWireEditorVias

verticalRouteGridOffset

verticalRouteGridPitch

viaTapAllowed

wireExtent

wrongWayOK

16

Spacing Constraints

checkSpaceAsMaxXY

endOfLineKeepout

forbiddenEdgePitchRange

forbiddenProximitySpacing

maxTapSpacing

mergeSpaceAllowed

minBoundaryInteriorHalo

minCenterToCenterSpacing

minClusterSpacing

minDiagonalSpacing

minDiffIslandParallelViaSpacing

minDiffPotentialSpacing

minEdgeLengthSpacing

minEnclosedSpacing

minEndOfLineCutSpacing

minEndOfLineExtensionSpacing

minEndOfLinePerpSpacing

minEndOfLineSpacing

minEndOfStubSpacing

minExtensionSpacing

minInnerVertexSpacing

minJointCornerSpacing

minNotchSpanSpacing

minOppositeSpanSpacing

minOuterVertexSpacing

minParallelSpanSpacing

minProtrudedProximitySpacing

minProtrusionSpacing

minProximitySpacing

minSameNetSpacing

minSideSpacing

minSpacing

minVoltageSpacing

oaAllowedSpacingRange

oaMinEndOfNotchSpacing

oaMinNotchSpacing

shapeRequiredBetweenSpacing

trimMinSpacing

17

Via Construction Constraints

allowedCutClass

cutClass

forbiddenCutClassSpacingRange

maxStressLength

minAdjacentViaSpacing

minCutClassClearance

minCutClassSpacing

minLargeViaArrayCutSpacing

minLargeViaArraySpacing

minLargeViaArrayWidth

minNeighborViaSpacing

minParallelViaSpacing

minParallelWithinViaSpacing

minRedundantViaSetback

minSameMetalSharedEdgeViaSpacing

minViaExtension

oaMinOrthogonalViaSpacing

oaMinParallelViaClearance

oaMinViaClearance

oaMinViaSpacing

rectangularLargeViaArraysAllowed

sameNetLargeViaSpacing

viaBarAdjacentSpacing

viaEdgeType

viaStackingAllowed

viaStackLimit

18

Wire Widening Constraints

wideningMinSplitValue

wideningTargetWidth

Return to top