Product Documentation
Virtuoso Layout Suite XL: Connectivity Driven Editing User Guide
Product Version IC23.1, November 2023

Defining a Pseudoparallel Connection

There are two ways in which you can define a pseudoparallel connection.

Using the Pseudoparallel Connect Command

To define a pseudoparallel connection for a set of instance terminals on a net:

  1. From the layout window menu bar, choose Connectivity – Pins – Pseudo Parallel Connect.
    A message in the layout window status banner prompts you to click to select a net.
  2. Click the net containing the instance terminals you want to connect.
    Flight lines appear between the pins on the specified net that can be pseudoparallel connected.
    If you were showing incomplete nets, those flight lines are removed automatically.
    A message in the layout window status banner prompts you to select an instance terminal.
  3. Click one or more pins of the selected net to select the instance terminals you want to connect in a pseudoparallel connection.
    The pseudoparallel connection is defined and the flight lines updated to show the connection.
  4. When you are done, press Esc to cancel the command.

Instead of selecting nets by clicking in the layout canvas, you can use the Define Pseudo Parallel Connected Net form.

To open the form:

  1. Press F3 while the Pseudo Parallel Connect command is active.
    The Define Pseudo Parallel Connected Net form is displayed. The form lists all the nets with no I/O pins.
    In the form, type the name of a net in the Net field or select the net names from the list.
    You can work on more than one net at a time by choosing multiple nets in the form or dragging your cursor in the design window to select an area when the command line prompts you to select a net.
    You must define pseudoparallel connectivity within a net. You cannot define pseudoparallel connectivity between nets.
  2. When you are done, press Esc to cancel the command.
    You can change between the Must Connect, Strongly Connected, Weakly Connected, and Pseudo Parallel Connect commands using the right mouse button.

Using the setPPConn Environment Variable

Setting the setPPConn environment variable to t automatically identifies and defines nodes that qualify as pseudoparallel connections.

To use the setPPConn environment variable,

Related Topics

setPPConn

Pseudoparallel Connections


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