Shield Process Rule Override Editor Form
To open the Shield Process Rule Override Editor form, double-click a field in the Shield column on the Nets tab. Alternatively, double-click a field in the Shield column on the Shield tab.
The Shield Process Rule Override Editor form has the following components.
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Toolbar
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Lets you copy and delete a constraint.
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Fields
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Lets you specify the options for shield constraints.
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Toolbar
The following table lists the functions of the different buttons on the Shield CG Editor form toolbar.
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Icon
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Command
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Description
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Copy Constraint Group
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Lets you copy the constraint group.
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Delete Constraint Group
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Lets you delete the constraint group.
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Fields
The Shield Process Rule Override Editor form lets you specify the options for Shielding constraints. The form contains the following fields.
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Field
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Description
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Shield Group Name
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Lets you select a pre-existing shielding constraint.
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Shield Type
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Lets you specify the type of shield to create for the given signal nets. The shielding types are: None, Parallel, Tandem, and Coaxial.
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None No shield.
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Parallel Planar shield wires parallel to the signal wire.
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Coaxial Both tandem and parallel shields to surround the signal wire on four sides.
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Tandem Shield wires on a given layer above and below the signal wire.
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Shield Enclosure
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Lets you select the enclosure type to add shield wires all around vias in the preferred direction. The shield enclosures are: None, Center, Half, and Full. The default is Half.
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Group Shield Type
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Lets you select a group shielding type. The group shielding types are Surround and Interleaved.
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Tolerance
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Lets you specify absolute tolerance when matching shield lengths.
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Valid Shield Layers
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Lets you select the layers to prevent shields from being added on the selected layers.
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Shield Width/Space
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Toggles to display the width and spacing layer table.
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Layer
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Displays the name of the layer.
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Min W
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Lets you specify the minimum width to be used for the layer.
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Min S
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Lets you specify the minimum spacing to be used for the layer.
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Advanced Shield
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Share Shields
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Lets you select whether or not shield routes can be shared by nets.
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Use Existing Shapes
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Lets you select whether or not to use the existing shapes.
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Shield Terminal
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Lets you select whether or not shield terminals should be connected.
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Shield Minimum Length
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Specifies whether or not to prevent shielding of any signal wire that is shorter than the given length.
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Tie Shield
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Specifies whether ties should be added to tie the new shield wires to the shield nets they belong to.
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Frequency
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Specifies the maximum distance between ties that must be inserted to tie the new shield wires to their respective shield nets.
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Shield Redundant Via
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Adds redundant vias to tie shield wires to shield nets at each location where the shield wires overlap their respective existing power and ground rails.
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Shield Via #Cuts
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The minimum cuts constraint for each cut layer matching a valid via for the shielding wires.
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Related Topics
Opening Routing Constraint Manager
Virtuoso Routing Constraint Manager
Routing Constraint Manager User Interface
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