How do I create a global bias path constraint?

You can use global bias path constraints to guide a net, group of nets, or a bus along a pre-designated path during global routing. These path-biased nets take priority over the other nets during global routing. This means that the global router may push other nets out of the way and make their routing less optimal.
Creating a path is similar to creating a polygon. To create a global bias path constraint:

1. Select a net, group of nets, or a bus from the Navigator assistant.
2. Click the Global Bias Setup icon on the Congestion Analysis assistant toolbar.
   The Global Bias Setup form displays. 
3. Click the New button to create a new global bias constraint group.
   A group is created and assigned a name by default. The name can be a number in a series starting from GB00. Also, the net selected in the Navigator assistant appears in the Nets list box.
4. Add and remove nets in the Global Bias Setup form.
5. Edit the global bias constraint group name by clicking in the Global Bias text field and specify another name.
6. To add a path bias constraint, click the + Paths button.
7. Click and drag to draw a path that you want the net to take in the heat map. The path created on the heat map is used as the coordinates for the bias path. 
   The bias path is automatically assigned a name by default. The name can be a number in a series starting from vsrGlobalBias_AB_00 and is displayed in the Bias Areas list box.
8. To see how the new constraint alters routing and congestion, click the ECO button in the Global Bias Setup form.
   Alternatively, choose Global Route and ECO Congestion Analysis from the drop-down list.

Related Topics

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How do I create a global bias positive region constraint?

How do I create a global bias negative region constraint?

How do I create multiple global bias constraints for specific layers?