Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

You can use Control click to select more than one device.

6.Click Apply.

Virtuoso XL checks parameters of those instances in the schematic against their parameters in the layout and updates the schematic parameters when it finds differences.

When Virtuoso XL checks or updates any instance, a Virtuoso XL Info window reports the updates that were made.

‘(-0.125 0.125)’

7. Press Escape to exit the command.

Updating Device Correspondence

You can use the Update Device Correspondence command to maintain connectivity in a layout when you want to

■Apply the connectivity from a symbol in the default schematic to a device in the layout

■Apply the connectivity from a group of symbols in the default schematic to a device or group of devices in the layout (many-to-many and many-to-one mapping)

■Apply connectivity to devices in a layout from a relevant schematic if you did not use Virtuoso XL to generate your layout

Note: Use the Connectivity – Update – Device Correspondence command with designs that are not LVS correct and have been created using Virtuoso XL. Use the Create – Device

Correspondence command for LVS correct designs that h

ave not been created using Virtuoso XL.

Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

It is helpful to have the Show Incomplete Nets command active when you update device correspondences so that you can see that the connectivity you want is made.

Note: You cannot preselect devices to use with the Update Device Correspondence command.

To update connectivity of a device or devices in the layout from a schematic, follow these steps.

1.From the layout window, choose Connectivity – Update – Device Correspondence. The schematic window prompts you to click on one or more symbols.

2.In a schematic window, click on the symbols whose connectivity you want to update in the layout.

Note: If you click on more than one symbol, the connectivity from those symbols is applied as a group to the device or devices you select in the layout. For example, as shown in the diagram, you might select N1, N2, R1, and R2 in the schematic to correspond to the device X in the layout.

Vdd

Vdd

R1 R2

3.With the cursor in the schematic window, press Return.

The layout window prompts you to select one or more corresponding objects in the layout window.

4.In the layout window, click on the object or objects to associate with the symbol.

Important

Device Correspondence will not list mismatched instances or pins that have the same name as an existing pin or instance. Rename the instance so that no name space overlap exists.