Constraints Summary

The table below lists Virtuoso Space-based Router constraints in alphabetical order and includes the following columns:

• Constraint is the name of the constraint with a link to its detailed description.
• Category identifies the constraint’s function group.
• Type identifies the constraint as Simple, Layer, Layer pair, or Layer array.
• Supported by indicates whether the constraint is supported by the checker and/or router. Although you can set and get values for the constraints listed here either directly or indirectly, these columns indicate whether those settings are used by during checking and/or routing. Notation is also given for constraints that have been replaced or are no longer supported.
  

  			Supported by
  Constraint	Category	Type	Checker	Router
  135RouteGridOffset	Routing	Layer	no	no
  135RouteGridPitch	Routing	Layer	no	no
  45RouteGridOffset	Routing	Layer	no	no
  45RouteGridPitch	Routing	Layer	no	no
  allowedLengthRange	Length and Width	Layer	Advanced Nodes Only	Advanced Nodes Only
  allowedNeighborDiffLayerWidthRange	Length and Width	Layer pair	yes	no
  allowedNeighborOverLayerWidthRange	Length and Width	Layer array	Advanced Nodes Only	no
  allowedNeighborWidthRange	Length and Width	Layer	Advanced Nodes Only	no
  allowedWidthRange	Length and Width	Layer	yes	yes
  antenna	Antenna	Layer	yes	yes
  antennaMetalAreaFactor	Antenna	Simple	yes	yes
  antennaMetalCutBelowAreaFactor	Antenna	Simple	yes	yes
  antennaMetalDiodeAreaFactor	Antenna	Simple	yes	yes
  antennaMetalGateAreaFactor	Antenna	Simple	yes	yes
  antennaMetalMinusDiodeAreaFactor	Antenna	Simple	yes	yes
  antennaViaAreaFactor	Antenna	Simple	yes	yes
  antennaViaDiodeAreaFactor	Antenna	Simple	yes	yes
  antennaViaGateAreaFactor	Antenna	Simple	yes	yes
  boundarySpace	Routing	Layer	no	no
  checkSpaceAsMaxXY	Spacing	Layer	obsolete
  CMPAnalysisGrid	CMP	Simple	yes	no
  CMPRegionHalo	CMP	Simple	yes	no
  cost	Routing	Layer	no	no
  crossTalkNeighborIndex	Mixed Signal Routing	Simple	no	yes
  cumulativeDAR	Antenna	Simple	yes	yes
  cumulativeGAR	Antenna	Simple	yes	yes
  cumulativeMetalAntenna	Antenna	Simple	yes	yes
  cumulativeSideWall	Antenna	Simple	yes	yes
  cumulativeViaAntenna	Antenna	Simple	yes	yes
  cumulativeViaDAR	Antenna	Simple	yes	yes
  cumulativeViaGAR	Antenna	Simple	yes	yes
  cumulativeViaSideWall	Antenna	Simple	yes	yes
  cutClass	Via Construction	Layer	yes	yes
  cutClassPreference	Routing	Layer	no	yes
  defaultHorizontalRouteGridOffset	Routing	Simple	yes	yes
  defaultHorizontalRouteGridPitch	Routing	Simple	yes	yes
  defaultMfgGrid	Routing	Simple	yes	yes
  defaultVerticalRouteGridOffset	Routing	Simple	yes	yes
  defaultVerticalRouteGridPitch	Routing	Simple	yes	yes
  densityFillKeepout	Density	Layer	yes	yes
  diagonalShapesAllowed	Miscellaneous	Layer	no	no
  diodeAreaRatio	Antenna	Layer	yes	yes
  discreteWidth	Length and Width	Layer	obsolete
  edgeMustCoincide	Miscellaneous	Layer pair	Advanced Nodes Only
  effectiveWidth	Length and Width	Layer	yes	yes
  endOfLineKeepout	Spacing	Layer	no	yes
  errorLayer	Miscellaneous	Layer	yes	no
  extendedValidRoutingVias	Routing	Simple	yes	yes
  forbiddenCutClassSpacingRange	Via Construction	Layer	Advanced Nodes Only	no
  forbiddenEdgePitchRange	Spacing	Layer	Advanced Nodes Only	no
  forbiddenProximitySpacing	Spacing	Layer	Advanced Nodes Only	no
  gapSpace	Mixed Signal Routing	Layer	obsolete
  gateAreaRatio	Antenna	Layer	yes	yes
  horizontalPlacementGridOffset	Placement and Alignment	Simple	no	no
  horizontalPlacementGridPitch	Placement and Alignment	Simple	no	no
  horizontalRouteGridOffset	Routing	Layer	yes	yes
  horizontalRouteGridPitch	Routing	Layer	yes	yes
  horizontalSymmetryLine	Mixed Signal Routing	Simple	no	yes
  ignoreShieldingOnLayers	Mixed Signal Routing	Simple	no	yes
  inlineViaPreferred	Routing	Layer pair	yes	yes
  inputTaperRule	Mixed Signal Routing	Simple	obsolete
  isDriver	Mixed Signal Routing	Simple	no	yes
  isRoutable	Routing	Layer	no	no
  keepAlignedShapeAndBoundary	Placement and Alignment	Layer	no	no
  keepAlignedShapes	Placement and Alignment	Layer pair	no	no
  largeViaClearance	Via Construction	Layer pair	obsolete
  largeViaSpacing	Via Construction	Layer	obsolete
  layerHeight	Routing	Layer	no	no
  layerThickness	Routing	Layer	yes	yes
  lengthPatternAccordion	Mixed Signal Routing	Simple	no	yes
  lengthPatternDangle	Mixed Signal Routing	Simple	no	yes
  lengthPatternEndRun	Mixed Signal Routing	Simple	no	yes
  lengthPatternOff	Mixed Signal Routing	Layer	no	yes
  lengthPatternRWAccordion	Mixed Signal Routing	Simple	no	yes
  lengthPatternTrombone	Mixed Signal Routing	Simple	no	yes
  limitRoutingLayers	Routing	Simple	yes	yes
  limitViaThruLayers	Routing	Simple	no	no
  matchTolerance	Mixed Signal Routing	Simple	no	yes
  maxClearance	Clearance	Layer pair	no	no
  maxClusterDistance	Mixed Signal Routing	Layer	no	yes
  maxCouplingDiff	Mixed Signal Routing	Simple	no	no
  maxCouplingDiffPercent	Mixed Signal Routing	Simple	no	no
  maxDensity	Density	Layer	yes	no
  maxDensityGradient	CMP	Layer	yes	no
  maxDiagonalEdgeLength	Length and Width	Layer	yes	no
  maxDiffDensity	Density	Layer	yes	no
  maxExtension	Extension	Layer pair	yes	no
  maxFloatingArea	Antenna	Simple	yes	no
  maxGroundCapDiff	Mixed Signal Routing	Simple	no	no
  maxGroundCapDiffPercent	Mixed Signal Routing	Simple	no	no
  maximumLength	Length and Width	Layer	no	no
  maxInterLayerDensityGradient	Density	Simple	yes	no
  maxJogLength	Length and Width	Layer	yes	no
  maxOxideCopperStepHeight	CMP	Layer	yes	no
  maxPickupDistanceAllowed	Routing	Layer	no	yes
  maxRoutingDistance	Routing	Layer	no	no
  maxRoutingDistanceAllowed	Routing	Layer	no	yes
  maxSingleCoupling	Mixed Signal Routing	Simple	no	no
  maxSingleCouplingPercent	Mixed Signal Routing	Simple	no	no
  maxStressLength	Via Construction	Layer pair	no	no
  maxSurfaceHeightRange	CMP	Layer	yes	no
  maxTaperWindow	Routing	Simple	yes	yes
  maxTapSpacing	Spacing	Layer	no	no
  maxThicknessGradient	CMP	Layer	yes	no
  maxThicknessGradientPercent	CMP	Layer	yes	no
  maxThicknessThreshold	CMP	Layer	yes	no
  maxThicknessThresholdPercent	CMP	Layer	yes	no
  maxWidth	Length and Width	Layer	yes	yes
  mergeSpaceAllowed	Spacing	Layer	no	no
  mfgGrid	Routing	Layer	yes	yes
  minAdjacentViaSpacing	Via Construction	Layer	yes	yes
  minArea	Area	Layer	yes	yes
  minAreaEdgeLength	Area	Layer	yes	yes
  minBoundaryExtension	Extension	Layer	yes	yes
  minBoundaryInteriorHalo	Spacing	Layer	yes	yes
  minBumpoutEdgeLength	Length and Width	Layer	yes	yes
  minCenterLineExtension	Extension	Layer pair	yes	yes
  minCenterToCenterSpacing	Spacing	Layer	yes	yes
  minClearance	Clearance	Layer pair	yes	yes
  minClearanceOverLayer	Clearance	Layer array	no	no
  minClusterClearance	Clearance	Layer pair	no	no
  minClusterSpacing	Spacing	Layer	Advanced Nodes Only	no
  minConcaveCornerExtension	Extension	Layer pair	yes	yes
  minConcaveCornerOverlap	Overlap	Layer pair	no	no
  minConcaveEdgeLength	Length and Width	Layer	yes	yes
  minConvexEdgeLength	Length and Width	Layer	yes	yes
  minCoupling	Mixed Signal Routing	Simple	no	no
  minCouplingPercent	Mixed Signal Routing	Simple	no	no
  minCutClassClearance	Via Construction	Layer pair	yes	yes
  minCutClassSpacing	Via Construction	Layer	yes	yes
  minCutRoutingClearance	Clearance	Layer pair	no	no
  minDensity	Density	Layer	yes	yes
  minDensityGradient	CMP	Layer	yes	no
  minDensityHole	Density	Layer	yes	no
  minDiagonalEdgeLength	Length and Width	Layer	yes	yes
  minDiagonalSpacing	Spacing	Layer	no	yes
  minDiagonalWidth	Length and Width	Layer	yes	yes
  minDiffIslandParallelViaSpacing	Spacing	Layer	obsolete
  minDiffPotentialSpacing	Spacing	Layer	no	no
  minDirectionalOverlap	Overlap	Layer pair	Advanced Nodes Only	no
  minDualEndOfLineExtension	Extension	Layer pair	yes	no
  minDualExtension	Extension	Layer pair	yes	yes
  minEdgeAdjacentDistance	Length and Width	Layer	yes	yes
  minEdgeLength	Length and Width	Layer	yes	yes
  minEdgeLengthSpacing	Spacing	Layer	Advanced Nodes Only	no
  minEdgeMaxCount	Length and Width	Layer	yes	yes
  minEnclosedArea	Area	Layer	yes	yes
  minEnclosedSpacing	Spacing	Layer	no	no
  minEndOfLineCutSpacing	Spacing	Layer pair	no	no
  minEndOfLineEdgeExtension	Extension	Layer pair	yes	no
  minEndOfLineExtension	Extension	Layer pair	yes	yes
  minEndOfLineExtensionSpacing	Spacing	Layer	yes	yes
  minEndOfLinePerpSpacing	Spacing	Layer	yes	yes
  minEndOfLineSpacing	Spacing	Layer	yes	yes
  minEndOfStubSpacing	Spacing	Layer	yes	yes
  minExtension	Extension	Layer pair	yes	yes
  minExtensionEdge	Extension	Layer pair	yes	yes
  minExtensionToCorner	Extension	Layer pair	Advanced Nodes Only	no
  minExtensionSpacing	Spacing	Layer	yes	no
  minFillPatternSpacing	Density	Layer	yes	no
  minFillToFillSpacing	Density	Layer	yes	no
  minimumLength	Length and Width	Layer	no	yes
  minInnerVertexClearance	Clearance	Layer pair	yes	no
  minInnerVertexSpacing	Spacing	Layer array	yes	yes
  minJogLength	Length and Width	Layer	yes	no
  minLargeViaArrayCutSpacing	Via Construction	Layer	yes	yes
  minLargeViaArraySpacing	Via Construction	Layer	yes	yes
  minLargeViaArrayWidth	Via Construction	Layer	yes	yes
  minNeighborExtension	Extension	Layer pair	Advanced Nodes Only
  minNeighboringShapesClearance	Clearance	Layer pair	Advanced Nodes Only	no
  minNeighborViaSpacing	Via Construction	Layer	yes	yes
  minNotchSpanSpacing	Spacing	Layer	yes	yes
  minNumCut	NumCut	Layer	yes	yes
  minOneDArrayStructure	Miscellaneous	Layer array	yes	no
  minOppositeSpanSpacing	Spacing	Layer	yes	yes
  minOuterVertexSpacing	Spacing	Layer pair	yes	yes
  minOverlap	Overlap	Layer pair	yes	yes
  minParallelSpanSpacing	Spacing	Layer	yes	yes
  minParallelViaSpacing	Via Construction	Layer	yes	yes
  minParallelWithinViaSpacing	Via Construction	Layer	yes	yes
  minPerimeter	Length and Width	Layer	yes	yes
  minPgFillBoundarySpacing	Density	Layer	yes	no
  minPgFillClockSpacing	Density	Layer	yes	no
  minPgFillFloatingFillSpacing	Density	Layer	yes	no
  minPgFillPgSpacing	Density	Layer	yes	no
  minPgFillSignalSpacing	Density	Layer	yes	no
  minPgFillSpacing	Density	Layer	yes	no
  minProtrudedProximitySpacing	Spacing	Layer	yes	yes
  minProtrusionNumCut	NumCut	Layer	yes	yes
  minProtrusionSpacing	Spacing	Layer	yes	yes
  minProtrusionWidth	Length and Width	Layer	yes	yes
  minProximitySpacing	Spacing	Layer	yes	yes
  minQuadrupleExtension	Extension	Layer pair	yes	no
  minRedundantViaSetback	Via Construction	Layer pair	yes	yes
  minSameMetalSharedEdgeViaSpacing	Via Construction	Layer	yes	yes
  minSameNetClearance	Clearance	Layer pair	yes	yes
  minSameNetSpacing	Spacing	Layer	yes	yes
  minSideClearance	Clearance	Layer pair	yes	no
  minSideExtension	Extension	Layer pair	yes	no
  minSideSpacing	Spacing	Layer	no	Advanced Nodes Only
  minSize	Length and Width	Layer	yes	yes
  minSpacing	Spacing	Layer	yes	yes
  minTaperWindow	Routing	Simple	yes	yes
  minThicknessGradient	CMP	Layer	yes	no
  minThicknessGradientPercent	CMP	Layer	yes	no
  minThicknessThreshold	CMP	Layer	yes	no
  minThicknessThresholdPercent	CMP	Layer	yes	no
  minTouchingDirectionClearance	Clearance	Layer pair	no	no
  minTouchingDirectionExtension	Extension	Layer array	no	no
  minViaExtension	Via Construction	Layer pair	yes	yes
  minViaJointExtension	Extension	Layer pair	yes	no
  minVoltageClearance	Clearance	Layer pair	yes	yes
  minVoltageSpacing	Spacing	Layer	yes	yes
  minWidth	Length and Width	Layer	yes	yes
  minWireExtension	Extension	Layer	no	no
  minWireOverlap	Overlap	Layer pair	Advanced Nodes Only	Advanced Nodes Only
  msConnectSupplyDistance	Mixed Signal Routing	Simple	no	yes
  msMatchPerLayer	Mixed Signal Routing	Simple	no	yes
  msMaxCap	Mixed Signal Routing	Simple	no	yes
  msMaxRes	Mixed Signal Routing	Simple	no	yes
  msMaxWidth	Mixed Signal Routing	Simple	no	no
  msMinCap	Mixed Signal Routing	Simple	no	yes
  msMinLengthPatternPitch	Mixed Signal Routing	Layer	no	yes
  msMinNumCut	Mixed Signal Routing	Simple	obsolete
  msMinRes	Mixed Signal Routing	Simple	no	yes
  msMinSpacing	Mixed Signal Routing	Simple	obsolete
  msMinWidth	Mixed Signal Routing	Simple	obsolete
  msOverhang	Mixed Signal Routing	Simple	obsolete
  msSameMask	Mixed Signal Routing	Simple	yes	yes
  msTolerance	Mixed Signal Routing	Simple	no	yes
  numStrands	Mixed Signal Routing	Simple	no	yes
  oaAllowedSpacingRange	Spacing	Layer	yes	yes
  oaDefault135RouteGridOffset	Routing	Simple	no	no
  oaDefault135RouteGridPitch	Routing	Simple	no	no
  oaDefault45RouteGridOffset	Routing	Simple	no	no
  oaDefault45RouteGridPitch	Routing	Simple	no	no
  oaDummyPolyExtension	Extension	Layer array	no	no
  oaGateOrientation	Miscellaneous	Layer	no	no
  oaMinEdgeAdjacentLength	Length and Width	Layer	yes	no
  oaMinEndOfNotchSpacing	Spacing	Layer	yes	yes
  oaMinNotchSpacing	Spacing	Layer	yes	yes
  oaMinOrthogonalViaSpacing	Via Construction	Layer	yes	yes
  oaMinParallelViaClearance	Via Construction	Layer pair	yes	yes
  oaMinRectArea	Area	Layer	yes	yes
  oaMinViaClearance	Via Construction	Layer pair	yes	yes
  oaMinViaSpacing	Via Construction	Layer	yes	yes
  oaPreferredRoutingDirection	Routing	Layer	yes	yes
  oaTaperHalo	Routing	Simple	yes	yes
  offset	Routing	Layer	yes	yes
  orthogonalSnappingLayer	Routing	Layer pair	yes	yes
  outputTaperRule	Mixed Signal Routing	Simple	obsolete
  pgFillWidth	Length and Width	Layer	yes
  planarTapAllowed	Routing	Simple	no	no
  preferredExtensionDirection	Routing	Layer	yes	no
  preferredHorizontalDir	Routing	Simple	obsolete
  preferredVerticalDir	Routing	Simple	obsolete
  preferredViaOrigin	Routing	Layer pair	yes
  rectangularLargeViaArraysAllowed	Via Construction	Layer	yes	yes
  rectangularShapeDirection	Miscellaneous	Layer	yes	yes
  routeMaxLength	Mixed Signal Routing	Simple	no	yes
  routeMinLength	Mixed Signal Routing	Simple	no	yes
  routeOnGrid	Routing	Simple	no	yes
  sameNetLargeViaSpacing	Via Construction	Layer	obsolete
  shapeRequiredClearance	Clearance	Layer pair	yes	no
  shapeRequiredBetweenSpacing	Spacing	Layer pair	Advanced Nodes Only	no
  shareShields	Mixed Signal Routing	Simple	no	yes
  shieldRule	Mixed Signal Routing	Simple	obsolete
  shieldWidth	Mixed Signal Routing	Layer	obsolete
  sideWall	Antenna	Layer	yes
  strandSpacing	Mixed Signal Routing	Layer	no	no
  strandWidth	Mixed Signal Routing	Layer	no	yes
  tandemLayerAbove	Mixed Signal Routing	Layer	no	yes
  tandemLayerBelow	Mixed Signal Routing	Layer	no	yes
  tandemWidth	Mixed Signal Routing	Layer	no	yes
  taperRule	Mixed Signal Routing	Simple	obsolete
  taperToFirstVia	Routing	Simple	yes	yes
  TJunctionAllowed	Routing	Simple	no	yes
  trimMinSpacing	Spacing	Layer	yes	yes
  trimShape	Miscellaneous	Layer	yes	yes
  validAntennaDiodes	Antenna	Simple	yes	yes
  validFillerCells	Antenna	Simple	yes	yes
  validRoutingLayers	Routing	Simple	yes	yes
  validRoutingVias	Routing	Simple	yes	yes
  validWireEditorVias	Routing	Simple	yes	yes
  verticalPlacementGridOffset	Placement and Alignment	Simple	no	yes
  verticalPlacementGridPitch	Placement and Alignment	Simple	no	no
  verticalRouteGridOffset	Routing	Layer	yes	no
  verticalRouteGridPitch	Routing	Layer	yes	yes
  verticalSymmetryLine	Mixed Signal Routing	Simple	no	yes
  via2ViaPitch	Routing	Layer	no	yes
  viaAbove	Routing	Layer	no	yes
  viaBarAdjacentSpacing	Via Construction	Layer	obsolete
  viaBelow	Routing	Layer	no	yes
  viaEdgeType	Via Construction	Layer	not applicable	not applicable
  viaStackingAllowed	Via Construction	Layer pair	yes	yes
  viaStackLimit	Via Construction	Simple	yes	yes
  viaTapAllowed	Routing	Simple	no	no
  wideningMinSplitValue	Wire Widening	Layer	yes	no
  wideningTargetWidth	Wire Widening	Layer	yes	no
  wire2ViaPitch	Routing	Layer	no	yes
  wire2ViaPitchDown	Routing	Layer	no	yes
  wire2ViaPitchUp	Routing	Layer	no	yes
  wire2WirePitch	Routing	Layer	no	yes
  wireExtent	Routing	Layer	no	no
  wrongWayOK	Routing	Layer	no	yes

Related Topics

Constraint Definitions

Constraint Group Types