routingDirections

routingDirections(
( tx_layer t_direction )
…

) ;routingDirections

Allows you to override the routingDirections (routing layer direction) layer attribute for a defined section (bounded area) of a design. Applying a constraint group specifying routingDirections to a bounded area redefines the routing directions within that area.

Values

tx_layer	The layer on which the constraint is applied. Type: String (layer and purpose names) or Integer (layer number)
t_direction	The routing direction for the layer inside any area to which the constraint group is applied. Valid values include vertical, horizontal, leftDiag, rightDiag, and none. leftDiag = 135 degrees rightDiag = 45 degrees

Parameters

None

Example

Layer attributes are defined as follows:

layerRules(
    routingDirections(
     ("Metal1" "horizontal")
  ("Metal2" "vertical")
  ("Metal3" "rightDiag")
  ("Diff"   "none")
  ("Via1"   "notApplicable")
 ) ;routingDirections
) ;layerRules

The routingDirections constraint group is defined as follows:

constraintGroups(
    ("myRoutingLayerOverrides"
     routingDirections(
   ("Metal1" "rightDiag")
   ("Metal2" "horizontal")
   ("Metal3" "none")
  ) ;routingDirections
 ) ;myRoutingLayerOverrides
) ;constraintGroups

Applying the myRoutingLayerOverrides constraint group to a bounded area sets the following routing directions within that area:

• Metal1 to rightDiag instead of horizontal
• Metal2 to horizontal instead of vertical
• Metal3 to none instead of rightDiag; thereby, allowing it to take any routing direction, instead of being restricted to one

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