minEndOfLineSpacing

spacings(
( minEndOfLineSpacing tx_layer
     ['horizontal | 'vertical]
     'width f_width ['oppWidth f_oppWidth]
     'distance f_eolWithin ['negativePRL]
     ['paraEdgeWithin f_parWithin 'paraEdgeSpace f_parSpace
          ['paraEdgeCount x_edgeCount]
          ['subtractWidth] 
          ['paraMinLength f_parMinLength]
          ['sameMetal | 'sameNet]
          ['nonEolCornerOnly]
          ['prl f_prl]
          ['parallelSameMask]
     ]
     ['cutEolSpace f_cutEolSpace
          ['cutClass {f_width | (f_width f_length) | t_name}]
          ['cutEolAbove | 'cutEolBelow]
          ['enclosureEndWidth g_enclosureEndWidth
               ['enclosureEndWithin g_enclosureEndWithin]
          ]
     ]
     ['widthRanges (g_ranges)]
     ['extendBy f_extendBy]
     ['sizeBy f_sizeBy]
     ['sameMask | 'diffMask]
     ['fillConcaveCorner f_fill]
     ['exactEolWidth]
     ['exceptExactEolWidth (f_exactWidth f_otherWidth)]
     ['wrongDirSpace f_wrongDirSpace]
     ['wrongDirWithin f_wrongDirWithin]
     ['endToEndSpace f_endToEndSpace
          ['otherEndWidth f_otherEndWidth]
          ['oneCutSpace f_oneCutSpace]
  ['twoCutSpace f_twoCutSpace]
          ['extension {f_extension | (f_extension f_wrongDirExtension)}]
  ['bothWires]['equalRectWidth]
     ]
     ['maxLength f_maxLength | 'minLength f_minLength ['twoSides]]
               ['encloseDistance f_encloseDist 'cutToMetalSpace f_cutToMetalSpace
          ['above | 'below] 
          ['allCuts]
     ]
     ['exceptExactAligned]
     ['insideLayers (tx_layer1 tx_layer2 … tx_layerN)
      ['insidePurposes (t_purpose1 t_purpose2 … t_purposeN)]
          | 
      'outsideLayers (tx_layer1 tx_layer2 … tx_layerN)
      ['outsidePurposes (t_purpose1 t_purpose2 … t_purposeN)]
     ]
     f_eolSpace
)

) ;spacings

This constraint can also be applied using the following legacy syntax:

spacings(
( minEndOfLineSpacing tx_layer
     (f_width f_eolWithin [f_parWithin [f_parSpace [x_edgeCount]]]
     f_eolSpace)
)

) ;spacings

Specifies the minimum edge-to-edge spacing between an end-of-line shape and neighboring parallel shapes that are within the specified region of the end-of-line shape on a layer. The number of supported neighboring parallel shapes is zero, one, or two. Typically, the spacing allowed using this constraint (eolSpace) is slightly larger than the minimum allowed spacing on the specified layer. However, the minimum allowed spacing must be greater than the lateral verification distance (eolWithin) for the spacing check.

If two face-to-face edges have width less than eolWidth and their parallel run length is greater than zero, end-to-end spacing (endToEndSpace) applies instead of eolSpace.

The following figure illustrates the two scenarios explained above:

The following figures illustrate how the constraint applies when either one or two parallel edges are present inside the search window defined by parSpace and parWithin (parallel-edge check). If the number of parallel edges specified is two, they must be present on either side of the end-of-line shape. Edge-to-edge spacing must be greater than or equal to eolSpace.

The following figures illustrate two more scenarios in which edge-to-edge spacing must be greater than or equal to eolSpace.

If the two shapes are perpendicular to each other, the lateral verification distance applied in the right and wrong direction is eolWithin and wrongDirWithin, respectively, as shown below.

In the following figures, you can see the right-direction and wrong-direction extensions applied to two shapes that are face-to-face. The spacing requirement varies based on the number of vias present.

Values

tx_layer

The first layer on which the constraint is applied.

Type: String (layer and purpose names) or Integer (layer number)

f_eolSpace

The minimum required spacing between an end-of-line edge and its neighboring geometry.

Parameters

`'horizontal \| 'vertical`
	(Virtuoso Advanced Node for Layout Standard) The direction in which the constraint applies. If direction is not specified, the constraint applies to all end-of-line edges. `'horizontal`: The constraint applies only to vertical end-of-line edges. `'vertical`: The constraint applies only to horizontal end-of-line edges. Type: Boolean
`'width` f_eolWidth
	The constraint applies only if the end-of-line width is less than this value.
`'oppWidth` f_oppWidth
	The constraint applies only if a neighboring shape beyond the end-of-line edge has perpendicular span less than this value.
`'distance` f_eolWithin
	The end-of-line edge is extended on both sides by this value to define an exclusion region. A violation occurs if the lateral distance between an end-of-line edge and a neighboring shape is less than this value (lateral distance for applying the spacing check).
`'negativePRL`	(Virtuoso Advanced Node for Layout Only) The constraint applies only if a neighboring shape has a parallel run length of less than zero with the shape having an end-of-line edge measured in the routing direction.
`'paraEdgeWithin` f_parWithin
	The constraint applies only if the distance of a neighboring parallel shape from the end-of-line edge, measured along the end-of-line shape, is less than this value (parWithin).
'`paraEdgeSpace` f_parSpace
	The constraint applies only if the lateral distance between an end-of-line shape and a neighboring parallel shape is less than this value (parSpace).
`'paraEdgeCount` x_edgeCount
	The constraint applies only if the number of neighboring parallel shapes that satisfy both `'paraEdgeWithin` and `'paraEdgeSpace` is equal to this value. Supported values are 0, 1, and 2. If this value is equal to `2`, the two neighboring parallel edges must be on opposite sides of the end-of-line shape.
`'subtractWidth`	The constraint applies only if the lateral distance between an end-of-line shape and a neighboring parallel shape is less than the value obtained after subtracting eolWidth from parSpace. Type: Boolean
'`paraMinLength` f_parMinLength
	The length of the end-of-line side must be greater than this value for a parallel edge on that side to be counted while applying the parallel-edge check.
`'sameNet \| 'sameMetal`
	(Virtuoso Advanced Node for Layout Standard) The connectivity type. If connectivity type is not specified, the constraint applies to any connectivity type, including any two shapes on the same layer with no common metal or net. `'sameNet`: The constraint applies only if the end-of-line shape and the neighboring shapes are on the same net. `'sameMetal`: The constraint applies only if the neighboring edges on the side and perpendicular to the end-of-line edge are part of a contiguous same-metal shape. The constraint does not apply if the neighboring edge on the side extends beyond the search window. Type: Boolean
`'nonEolCornerOnly`	The constraint does not apply if a corner inside the search window is formed by a non-end-of-line edge. Type: Boolean
`'prl` f_prl	The constraint applies only if the parallel run length between an end-of-line side and a neighboring edge is greater than this value.
`'parallelSameMask`	(Virtuoso Advanced Node for Layout Only) The constraint applies only if the neighboring parallel shape found inside the search window has the same mask as that applied to the end-of-line edge. A neighboring parallel shape with a different mask is ignored. Type: Boolean
`'cutEolSpace` f_cutEolSpace
	The spacing between an end-of-line edge that touches a via cut on a cut layer above or below the metal layer and a non-end-of-line edge perpendicular to it must be greater than or equal to this value.
`'cutClass {`f_width \| (f_width f_length) \| t_name`}`
	The cut class to which the constraint applies, specified by width, by width and length, or by name (as defined in a cutClasses constraint). f_width: Width f_length: Length t_name: Name of the cut class
`'cutEolAbove \| 'cutEolBelow`
	The cutEolSpace spacing is applied only if the metal end-of-line edge touches a shape on a cut layer above or below the metal layer, depending on the parameter specified. Type: Boolean
`'enclosureEndWidth` f_enclosureEndWidth
	The constraint applies only if the width of the end-of-line edge touching a via cut is less than this value.
`'enclosureEndWithin` f_enclosureEndWithin
	The end-of-line edge intersecting a via cut is extended on both sides by this value, instead of eolWithin, to define the exclusion region.
`'widthRanges (g_ranges)`
	(Virtuoso Advanced Node for Layout Standard) The constraint applies only if the end-of-line width is in the specified range. Type: Floating-point values specifying a range of widths that are allowed
`'extendBy` f_extendBy
	(Virtuoso Advanced Node for Layout Standard) An extension equal to this value is applied to an end-of-line edge in the projection direction before the constraint is applied. The extension is applied to both shapes, and not just to the end-of-line shape.
`'sizeBy` f_sizeBy	(Virtuoso Advanced Node for Layout Standard) An end-of-line edge is extended on both sides by this value before the constraint is applied.
`'sameMask \| 'diffMask`
	(Virtuoso Advanced Node for Layout Standard) The mask type. `'sameMask`: The constraint applies only between shapes on the same mask. `'diffMask`: The constraint applies only between shapes on different masks. Type: Boolean
`'fillConcaveCorner` f_fill
	(Virtuoso Advanced Node for Layout Only) A concave corner that is in the neighborhood of an end-of-line edge is filled with a triangular shape whose sides measured along the concave edges are equal to this value before the spacing between the concave corner and the end-of-line edge is measured.
`'exactEolWidth`	(Virtuoso Advanced Node for Layout Standard) The constraint applies only if the end-of-line width is equal to this value. Type: Boolean
`'exceptExactEolWidth (`f_exactWidth f_otherWidth)
	(Virtuoso Advanced Node for Layout Only) The constraint does not apply if the end-of-line width is equal to exactWidth and the width of the neighboring edge is less than or equal to otherWidth.
`'wrongDirSpace` f_wrongDirSpace
	(Virtuoso Advanced Node for Layout Standard) The edge-to-edge spacing measured in the wrong direction (non-preferred routing direction) must be greater than or equal to this value.
`'wrongDirWithin` f_wrongDirWithin
	An end-of-line edge of a shape in the non-preferred routing direction is extended on both sides by this value, instead of eolWithin, to form the exclusion region. When this parameter is specified, the eolWithin value applies only to the end-of-line edges of shapes in the preferred routing direction.
`'endtoEndSpace` f_endToEndSpace
	The spacing between two end-of-line edges that face each other and have parallel run length greater than zero must be greater than or equal to this value.
`'otherEndWidth` f_otherEndWidth
	The constraint applies only if a shape facing an end-of-line edge has width less than this value. This parameter can be specified with or without `endtoEndSpace` parameter. If it is specified with `endtoEndSpace` parameter with the value greater than `minEndOfLineSpacing` constraint value, the DRD checker checks the width of other end of the shapes in the region created between `minEndOfLineSpacing` and `endToEndSpace`. If the `endToEndSpace` parameter is not specified, `otherEndWidth` is checked verifying the region created for `minEndOfLineSpacing` constraint.
`'oneCutSpace` f_oneCutSpace
	The spacing between two end-of-line edges, one of which touches a via cut, must be greater than or equal to this value.
`'twoCutSpace` f_twoCutSpace
	The spacing between two end-of-line edges, both of which touch a via cut each, must be greater than or equal to this value.
`'extension {`f_extension `\| (`f_extension f_wrongDirExtension`)}`
	f_extension: The extension applied to both ends of an end-of-line edge of a shape routed in the preferred direction. For example, if the preferred routing direction is vertical, an end-of-line shape that is routed vertically has a horizontal end-of-line edge and horizontal extensions (right-direction extensions). f_wrongDirExtension: The extension applied to both ends of an end-of-line edge of a shape routed in the non-preferred direction. For example, if the preferred routing direction is vertical, an end-of-line shape that is routed horizontally has a vertical end-of-line edge and vertical extensions (wrong-direction extensions).
`'maxLength` f_maxLength
	The constraint does not apply if both sides of the end-of-line shape are greater than this value in length.
`'minLength` f_minLength
	The constraint does not apply if both sides of the end-of-line shape are less than this value in length.
`'twoSides`	The constraint applies only if both sides of the end-of-line shape are greater than or equal to minLength. Type: Boolean
`'bothWires`	(Virtuoso Advanced Node for Layout Standard) The spacing between two end-of-line edges must be greater than or equal to endToEndSpace if the length of both the shapes is greater than or equal to minLength or less than or equal to maxLength, depending on which of the two parameters, `'minLength` or `'maxLength`, is specified. Type: Boolean
`'equalRectWidth`	The constraint applies only if the length of the end-of-line edge is equal to the width of the shape. If multiple `minEndOfLineSpacing` constraints are defined on a layer and `'equalRectWidth` is specified with even one of them, then `'equalRectWidth` must be specified with all of them. Type: Boolean
`'encloseDistance` f_encloseDistance
	The constraint applies only if there is a via cut above or below the metal layer and the distance between the via-cut edge and the end-of-line edge is less than this value.
`'cutToMetalSpace` f_cutToMetalSpace
	The constraint applies only if the distance between the via-cut edge and the edge facing the end-of-line edge is less than this value.
`'above \| 'below`	The constraint applies to a shape on a cut layer either above or below the metal layer. If this parameter is not specified, the constraint applies to shapes on cut layers both above and below the metal layer. Type: Boolean
`'allCuts`	The constraint applies to all cuts that connect a same-metal shape, both above and below the metal layer. Otherwise, only one such via cut needs to satisfy the constraint. Type: Boolean
`'exceptExactAligned`
	(Virtuoso Advanced Node for Layout Standard) The constraint applies only if the shapes are not exactly aligned. Type: Boolean
`'insideLayers (`tx_layer1 tx_layer2 `…` tx_layerN`) \| 'outsideLayers (`tx_layer1 tx_layer2 `…` tx_layerN`)`
	Determines if the constraint applies, based on the presence or absence of one or more layers. `'insideLayers`: The constraint applies only if the shapes on the specified layer (layer) overlap a shape on one of these layers (layer1 layer2 … layerN). `'outsideLayers`: The constraint applies only if the shapes on the specified layer (layer) overlap the region outside the shapes on one of these layers (layer1 layer2 … layerN). For more information, see Region-based Rule (One layer). Type: String (layer name) or Integer (layer number)
`'insidePurposes (`t_purpose1 t_purpose2 `…` t_purposeN`)`
	The `'insideLayers` parameter is limited to only the specified purposes. Type: String (purpose name)
`'outsidePurposes (`t_purpose1 t_purpose2 `…` t_purposeN`)`
	The `'outsideLayers` parameter is limited to only the specified purposes. Type: String (purpose name)

Examples

Example 1: minEndOfLineSpacing with widthRanges and exactEolWidth

The end-of-line spacing between Metal1 wires must be at least 0.09 if the end-of-line width is greater than or equal to 0.05 and less than 0.1, and at least 0.07 if the end-of-width is equal to 0.1.

Example 2: minEndOfLineSpacing with oppWidth and minLength

The end-of-line spacing between Metal1 wires must be at least 0.12 when the minimum length of an end-of-line side is less than 0.06 and the width of the wire perpendicular to the end-of-line edge is 0.08. The lateral verification distance for the spacing check is 0.05.

Example 3: minEndOfLineSpacing with paraEdgeWithin, paraEdgeSpace, and subtractWidth

The end-of-line spacing between Metal1 wires must be at least 0.15 if the following conditions are met:

The end-of-line width is less than 0.1.
A parallel neighboring edge is present inside the search window defined by eolWithin = 0.05, parWithin = 0.03, and parSpace = 0.16. The dimensions of the search window are calculated dynamically based on the end-of-line width of the wire.

Example 4: minEndOfLineSpacing with endToEndSpace, minLength, and twoSides

The end-of-line spacing between Metal1 wires must be at least 0.1 and the end-to-end spacing must be at least 0.12 if the length of both end-of-line sides is greater than or equal to is 0.11.

Example 5: minEndOfLineSpacing with widthRanges, extendBy, and sizeBy

The end-of-line spacing must be at least 0.3 when measured in the vertical direction if the end-of-line edge has width less than or equal to 0.3 or equal to 0.6 or to 0.8. The spacing is measured after applying an extension of 0.2 to the end-of-line edge in the projection direction (extendBy) and 0.1 on both sides of the end-of-line edge (sizeBy).

Example 6: minEndOfLineSpacing with widthRanges, extendBy, sizeBy, and endToEndSpace

The end-of-line spacing must be less than 0.3 and end-to-end spacing must be equal to 0.3 if the end-of-line edge has width less than or equal to 0.3 or equal to 0.6 or to 0.8. The spacing is measured after applying an extension of 0.2 to the end-of-line edge in the projection direction (extendBy) and 0.1 on both sides of the end-of-line edge (sizeBy).

Example 7: minEndOfLineSpacing with paraEdgeWithin, paraEdgeSpace, and sameMetal

The end-of-line spacing between Metal1 wires must be at least 0.13 if a parallel edge present inside the search window is part of a contiguous same-metal shape. The search window is defined by eolWithin = 0.05, parWithin = 0.07, and parSpace = 0.12.

Example 8: minEndOfLineSpacing with diffMask, endToEndSpace, and exceptExactAligned

The end-of-line spacing must be at least 0.11 and end-to-end spacing must be at least 0.13 between non-exactly-aligned wires on different masks if the end-of-line edge has width less than 0.08. The lateral verification distance for the spacing check is 0.02.

Example 9: minEndOfLineSpacing with fillConcaveCorner

A concave corner present in the neighborhood of an end-of-line edge must be filled by a triangle whose sides along the concave edges are equal to 0.04 before end-of-line spacing of 0.06 is applied. The end-of-line width of the wire must be less than 0.1.

Example 10: minEndOfLineSpacing with exceptExactEolWidth

The end-of-line spacing between Metal1 wires must be at least 0.06 except if the end-of-line width of one shape is equal to 0.07 and the end-of-line width of the other shape is less than 0.05.

Example 11: minEndOfLineSpacing with paraEdgeWithin, paraEdgeSpace, and nonEolCornerOnly

The end-of-line spacing between Metal1 wires must be at least 0.13 if the following conditions are met:

The end-of-line width is less than 0.1.
A corner inside the search window is formed by another end-of-line edge.
A parallel edge is present inside the search window defined by eolWithin = 0.05, parWithin = 0.07, and parSpace = 0.12.

Example 12: minEndOfLineSpacing with equalRectWidth

The end-of-line spacing between Metal1 wires must be at least 0.15 if the end-of-line width is equal to the width of the wire. The end-of-line width must be less than 0.25 and the lateral verification distance for the spacing check is 0.10.

Example 13: minEndOfLineSpacing with cutEolSpace, wrongDirWithin, and endToEndSpace

The end-of-line spacing between Metal1 wires must be at least 0.1 if the following conditions are met:
- The end-of-line width is less than 0.08.
- The lateral verification distance for the spacing check is 0.05 for a shape routed in the preferred routing direction (eolWithin).
- The lateral verification distance for the spacing check is 0.06 for a shape routed in the non-preferred direction (wrongDirWithin).
The required edge-to-edge spacing between Metal1 wires must be at least 0.12 if the following conditions are met:
- The end-of-line edge intersects a VA via cut on a cut layer either above or below the metal layer.
- The end-of-line width is less than 0.14.
- The lateral verification distance for the spacing check is 0.05.
The end-to-end spacing between Metal1 wires must be greater than or equal 0.11 if the end-of-line edges do not touch a via cut, greater than or equal to 0.13 if an end-of-line edge touches a via cut, and greater than or equal to 0.15 if both end-of-line edges touch a via cut each. The right direction extension is 0.03 and the wrong direction extension is 0.08.

Example 14: minEndOfLineSpacing with horizontal

The end-of-line spacing between Metal1 wires must be at least 0.05 when measured in the horizontal direction if the following conditions are met:

The end-of-line width is less than 0.03.
The lateral verification distance for the spacing check is 0.03.

Example 15: minEndOfLineSpacing with paraEdgeWithin, paraEdgeSpace, paraMinLength, encloseDistance, and cutToMetalSpace

The end-of-line spacing between Metal1 wires must be at least 0.15 if the following conditions are met:

The width of the end-of-line shape is less than 0.1 (eolWidth) and the length of the end-of-line side is greater than or equal to 0.1 (paraMinLength).
A parallel edge is present inside the search window defined by eolWithin = 0.05, parWithin = 0.07, and parSpace = 0.1.
The distance of a via cut below the metal layer to the end-of-line edge is less than 0.06 (enclosed distance) and to an edge beyond the end-of-line edge is less than 0.16 (cut-to-metal space).

Example 16: minEndOfLineSpacing with width, eolWithin, parWithin, parSpace, and edgeCount

The end-of-line spacing, or eolSpace, between Metal1 wires must be at least 0.43 if:

width is 0.11
eolWithin is 0.12
parWithin is 0.13
parSpace is 0.14
edgeCount is 15

spacings( ( minEndOfLineSpacing "Metal1" (0.11 0.12 0.13 0.14 15 0.43 )
) ;spacings

Example 17: minEndOfLineSpacing with distance and negativePRL

The end-of-line spacing must be at least 0.023 with other parameters as indicated. The constraint applies only if the parallel run length measured in the routing direction is negative.

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Virtuoso Technology Data Constraints ReferenceProduct Version IC23.1, November 2023