Virtuoso XL Layout Editor User Guide

Updating Design Data in Virtuoso XL

Computer Aided Mode

Computer Aided mode supports the following;

■Same check as Needed mode with additional LVS mappings

■Requires that all pins are mapped first then instances.

■Needs information from the user. The more information that you add to the form the better match you will have.

■Correspondence is set from the pins.

To create device correspondence using the Computer Aided mode;

1.Select Create – Device Correspondence.

2.Change the mode to Computer Aided.

The Sort By option and Show Instance Master Name is greyed out because these options only apply to instances.

The Message field asks you to Create“ Correspondence For All Pins”.

3.Change the Show option to Pins.

Whenever there are unmatched pins in both the connectivity source and in the layout the

Pins option will be displayed in the Show cyclic field.

4.Select pin(s) in the schematic and the corresponding pin(s) in the layout list box.

5.Select Map to map the pins.

6.Once all of the pins are mapped change the Show option to Instances.

7.Turn on the Show Instance Master Name option to view the library, cell, and view names.

8.A partial LVS algorithm will find possible mappings and will list them in the lower-left list box. If the mappings are correct, the mappings can be mapped using the “>” button.

Mappings can also be performed manually as in Needed mode.

For every Map/Unmap operation, device correspondence will incrementally search for new proposed LVS matches. The more mappings are realized, the incremental LVS algorithm will recognize the connectivity and will propose more matches.

Note: If a large number of instances are unmapped or the number of different masters is small, the LVS algorithm might return old mappings. In such case, manual mapping from the top boxes will provide the algorithm with new data and the algorithm will start