Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

The data you selected is saved in the template file.

12.Click OK.

Virtuoso XL puts any missing pins and components below the design boundary and updates their connectivity.

If a device that has been folded into fingers is missing in the layout, Virtuoso XL recreates the device.

If one or more fingers of a device that has been folded into fingers is missing in the layout, the CIW displays a warning that the fingers corresponding to the schematic instance are missing, but it does not recreate the fingers.

If a parameter regulating the width of the fingers of a folded device has changed in the schematic, it is not changed in the layout by this command. Use the Connectivity – Update – Layout Parameters command to implement parameter changes in the schematic that affect physical implementations in the layout.

Connectivity – Update – Components and Nets preserves many-to-one and many-to- many mapping between the connectivity source and the layout cellview.

Note: You can use the Edit – Undo command to undo any changes that you made with the

Connectivity – Update – Components and Nets command.

Updating Layout Parameters

To update the parameters of instances in the layout to match those in the schematic, follow these steps.

1.From the layout window, choose Connectivity – Update – Layout Parameters.

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

If you did not preselect instances, the CIW and the layout window prompt you to select devices whose parameters you want to update.

If there is no schematic referenced by the layout, the Define Connectivity Reference form appears. If there is currently a connectivity reference for the layout, that information is displayed. You can change the connectivity reference in this form.

Note: Connectivity-Update – Layout Parameters will update folded devices if the

Update Parameter option is turned on in the XL Options form. Check the size of folded devices manually to avoid overriding the specified size.

Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

2.Click OK on the Define Connectivity Reference form.

3.Select a device in the layout or schematic window.

You can use Shift click to select more than one instance. Virtuoso XL highlights the instance in the layout and the schematic window.

4.Move the cursor to the layout window and press Return.

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

5.To see a list of the layout devices, move the cursor to the layout window and press F3.

The Update Layout Device List form appears. For more information about this form, see

Change Inst View Device List Form/ Update Layout Device List Form/ Update Schematic Device List Form on page 475.

6.Click a device name in the Update Layout Device List form to select it.

You can use Control click to select more than one device and to deselect selected devices.

7.Click Apply.

Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

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

(unless you have set the ignore or lvsIgnore property on a device).

Information about layout instances that contain properties that are not on their schematic counterparts is displayed in the Virtuoso XL Info window.

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

If updating parameters results in a change in the layout, Virtuoso XL updates the connectivity and indicates any shorts with markers.

Note: Update Components and Nets does not update split transistors if the sizes of the resulting transistors are different because such transistors may be the result of manual splitting. If the layout figure selected for update is a transistor that has been folded, Virtuoso XL displays a message box that says that it is not updating the parameters.

8. Press Escape to exit the command.

Note: If you are using inherited connections in your design to assign more than one value to a global net, remember that the netSet properties on schematic instances, which specify the new value of a global signal, are not copied over with the instance from the schematic to the layout when you use the Gen From Source, Pick from Schematic, or Update Layout Parameters commands.

Updating Schematic Parameters

To update the parameters of devices in the schematic to match those in the layout, follow these steps.

Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

Note: You must have the schematic window open in edit mode to use this command.

1.From the layout window, choose Connectivity – Update – Schematic Parameters.

If you preselected instances, Virtuoso XL checks parameters of the selected instances in the schematic against the parameters of the corresponding instances in the layout and updates the schematic parameters when it finds differences. AVirtuoso XL Info window reports the change.

If you did not preselect instances, the CIW and layout window prompt you to select instances whose parameters you want to update.

2.Select a device in either the layout or schematic window.

You can use Shift click to select more than one device. Virtuoso XL highlights the device in the window.

3.Move the cursor to the layout window and press Return.

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 (unless you have set the ignore or lvsIgnore property on a device).

4.To see a list of the layout devices, move the cursor to the layout window and press F3.

The Update Schematic Device List form appears. For more information about this form, see Change Inst View Device List Form/ Update Layout Device List Form/ Update Schematic Device List Form on page 475.

Type the net name and click

the Search button.

The device name is highlighted.

5. Select a device name in the Update Schematic Device List form.