Global Bias Constraints
Visualizing and analyzing routing is effective only when you are able to make the changes to better suit the design. Congestion Analysis provides the support of global bias constraints, which can be used to plan routing. Once you have identified critical nets or groups of nets, you can add global bias constraints to manage and plan the routing path. These global bias constraints are persistent and are saved to OpenAccess.
The various aspects of biasing and how to see the actual results by running ECO global routing and congestion analysis are as follows:
- Creating a Global Bias Positive Region Constraint (attract net group into a region)
- Creating a Global Bias Negative Region Constraint (repel net group out of a region)
- Creating a Global Bias Path Constraint (guide net group along a path)
- Creating Multiple Global Bias Constraints for Specific Layers
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