Virtuoso XL Layout Editor User Guide

Wire Editing in the Virtuoso XL Layout Editor

Routing Options and Styles

Matching Path Width and Pin Widths

To set the path width to match a pin or an existing path, follow these steps:

1.From the layout window, choose Create – Path.

The Create Path form appears.

Note: You can also use the middle button to open the Layout pop-up menu and choose

Width – Match Pin Width or Match Path Width On once the Create – Path command is active.

2.Click or area select the pin or existing path to be routed.

3.Do one of the following:

Virtuoso XL Layout Editor User Guide

Wire Editing in the Virtuoso XL Layout Editor

To match the path width to the width of the pin you are editing, turn on Match Pin

Width and either choose Narrow, which matches the path width to the shortest side of the pin, or Wide which matches the path width to the longest side of the pin.

To match the path width to the width of the path you are editing, choose Match Path

Width.

The width change is not implemented if it introduces a clearance violation.

Matching Path Width and Pin Widths for Multiple Paths

To match the path width or specify a width for multiple paths, follow these steps

1.From the layout window, choose Create – Path.

2.Click or area select the pins or paths to be routed.

3.Turn on Match Pin Width or Match Path Width.

When multiple paths and pins are selected and Match Pin Width or Match Path Width are on, AS IS is displayed in the Width field.

4.Do one of the following:

Type the width to be used for all paths in the Width field.

To match each of the path widths to the width of the corresponding pins, turn on Match Pin Width and either choose Narrow, which matches the path width to the shortest side of the pin, or Wide which matches the path width to the longest side of the pin.

Virtuoso XL Layout Editor User Guide

Wire Editing in the Virtuoso XL Layout Editor

To match each of the path widths to the width of the corresponding path, choose

Match Path Width.

Gathering Bus Wires

Wires starting from pins that are not at minimum spacing are gathered to the minimum separation at the first digitized point. You can gather bus wires and change the spacing between wires before digitizing points by doing the following.

From Layout pop-up menu, choose Turn gather bus wires on.

The bus cursor changes and the wires are gathered to the minimum spacing rule. You can change the orientation of the bus cursor by using the Rotate Bus Cursor command.

Spacing for Gathered Bus Wires

You can change the default wire-to-wire spacing for gathered bus wires. You might want to choose spacing based on the via pattern you use when you change layers and add vias. For more information, refer to “Adding Vias to Gathered Bus Wires” on page 396.

1. From the Layout pop-up menu, choose Set up.

Virtuoso XL Layout Editor User Guide

Wire Editing in the Virtuoso XL Layout Editor

The Route Options form appears.

2.Click on the Bus tab and choose from the following spacing options:

Wire-Wire

Wire-Via

Via-Via

Specify Clearance

None

If you want to change the spacing while you are routing multiple wires, choose Setup from the Layout pop-up menu, make your change, and regather the wires. You can also override bus spacing when you are preparing to change routing layers.