Virtuoso XL Layout Editor User Guide

Troubleshooting Problems in the Virtuoso XL Layout Editor

If you need extra pins in the layout for feedthrough nets or substrate connections, consider adding those after you have completed the main portion of the design. Adding extra pins increases the number of nets the extractor manages and slows Virtuoso XL’s performance.

DefinelxExtractLayers only on layers to be used as interconnect during wiring with Virtuoso XL. Using more layers than necessary causes the extractor to check all shapes on those layers, which slows performance. If you do not have interconnect to wells, do not make the well layers lxExtractLayers.

Problems with Editing

Components Move Slowly

If you find that theMove command works too slowly, especially when you have many iterated instances, turn off the layout window Connectivity – Show Incomplete Nets command or display only nets that are relevant to the current task.

Extra Probes Appear

To delete unwanted probes in the schematic or layout windows, while the Probe command is active,

Click on an empty space in the design.

or at any time

Press Control-Shift-L.

Layout Generation Options Form Does Not Keep Values from the Last Entry

The Layout Generation Options form displays default values each time it opens, it does not carry over values from the previous entry. If you want to use values from a previous entry, you must save these values to a template and then use the Load option on the form to open the template and update the fields in the form with the information in the template.

Virtuoso XL Layout Editor User Guide

Troubleshooting Problems in the Virtuoso XL Layout Editor

Parameters Not Updated

If the parameters are not updated the way you expect, check for the presence of the lxIgnoredParams property on components of your design.

Schematic Not Editable

If you cannot make changes to the schematic,

■Check that the schematic is editable (the Schematic window Design menu shows the

Make Read Only command, not the Make Editable command).

■Check with your system administrator to be sure you have a license for the Virtuoso schematic editor (product 302).

Warning to Update Your Design Appears at Startup

When you open a design in Virtuoso XL and an Info window similar to this appears, it means that the schematic has been changed after the last time the layout was changed, so the layout is not the latest version of the design. You can update the layout from the changed schematic by using the layout window Connectivity – Check – Against Source command and then using either the Connectivity – Update – Components and Nets or Connectivity –

Update – Device Correspondence commands as needed.

Virtuoso XL Info

The schematic information has changed since this layout was last generated or updated. To insure a correct layout, you should run Connectivity - Check - Against Source to determined what has changed.