Virtuoso XL Layout Editor User Guide

Preparing Your Connectivity Source for the Virtuoso XL Layout Editor

The lxUseCell property appears in the Edit Component CDF form.

9.Click OK.

The system adds the lxUseCell parameter to the component.

For more information about CDFs, see the Component Description Format User Guide.

Using the lvsIgnore Property to Exclude Schematic Symbols

If you do not want the corresponding layout device for a symbol in the schematic to appear in the layout, you can exclude these symbols by setting the lvsIgnore, ignore, or nlAction property for the symbol. You can also set the lvsIgnore property for layout devices if you do not want Virtuoso XL to check them The lvsIgnore property can be set in either the Edit Properties form or the Edit Component CDF form.

Virtuoso XL Layout Editor User Guide

Preparing Your Connectivity Source for the Virtuoso XL Layout Editor

1.From the schematic window, choose Design – Make Editable to make the design editable.

2.In the schematic window, click on the symbol to select it.

3.From the schematic window, choose Edit – Properties – Objects.

The Edit Object Properties form appears.

4. Click Add.

Virtuoso XL Layout Editor User Guide

Preparing Your Connectivity Source for the Virtuoso XL Layout Editor

The Add Property form appears.

5.In the Name field, typelvsIgnore.

6.Set the Type cyclic field toboolean.

The Choices field disappears from the Add Property form.

7.Turn on Value and click OK.

Virtuoso XL Layout Editor User Guide

Preparing Your Connectivity Source for the Virtuoso XL Layout Editor

The lvsIgnore property appears in the Edit Object Properties form.

8.Click OK.

Virtuoso XL does not place the schematic symbol in the layout and does not highlight it as a missing device or as part of an incomplete net. Analog layout versus schematic (LVS) checking does not use symbols with lvsIgnore set to on.

Note: You can use the Virtuoso XL Layout Options form to set the ignore Names environment variable to define other properties to use as ignore properties.

If any property in the ignoreNames list is set to true then the instance will be ignored. The search for a given property is in the order the names are listed in the environment variable.In the example below the vxlIgnore property value is used because it is first in the list.