Virtuoso XL Layout Editor User Guide

Editing Your Layout with Virtuoso XL Layout Editor

If the pins you select do not permute, this form also tells you why.

Cannot permute these two pins due to the constraint of permuteRule

No permutation for pin C (net:vcc!) and pin B (net:AB)!

It is not recommended to set the Probe Options form to ’Pins’’ when probing pins for permuted instance. Instead set the Probe Options form to Nets to view the correct information.

Using Device Locking

To lock devices in their current positions in the layout (set temporary fixed constraints), so that they cannot be moved during interactive or automatic placement, follow these steps.

1.In the layout window, select the devices to lock.

2.From the layout menu, choose Edit – Other – Lock Selected.

The locked devices cannot be moved when the Constraint Assisted option is enabled in the Move or Stretch commands.

If the selected devices are constrained by other fixed constraints, a message window asks you to approve overwriting those constraints.

Fixed constraints for the selected devices appear in the constraint manager and the Constraint Status Browser Window if they are open.

When you save the design, a dialog box asks you if you want to convert the locked devices into permanent fixed constraints.

Click OK to convert the locks to fixed constraints.

To delete the locks on the devices you locked, follow these steps.

1.In the layout window, select the devices to unlock.

2.From the layout menu, choose Edit – Other – Unlock Selected.