Rules Definition at the Occurrence Level

An occurrence is an instance that is uniquely identified by its full path from the top-level design to the instance. Occurrences provide the ability to uniquely identify an object in the design and assign attributes to that object.

Occurrence binding is particularly useful for mixed-signal simulation.

In the Hierarchy Editor, you can assign the following attributes to an occurrence:

• Occurrence binding
• Occurrence stop point
• Occurrence-level bind-to-open

Setting any of the above attributes identifies the object as an occurrence.

The Hierarchy Editor provides an occurrence editing mode in the tree view. You can turn on the mode by selecting the following button in the toolbar:

The tree view displays Target: Occurrence when you select any object in the tree to indicate that any change you make gets applied to the occurrence.

In the Hierarchy Editor, occurrences are represented by the following icons:

To see a complete list of icons and color conventions used in the Virtuoso Hierarchy Editor,

• Choose Help – Legend.
  The Legend dialog box appears. This dialog box describes all the icons and color conventions.

Not all Cadence tools support occurrences. Before you use the occurrence feature of the Hierarchy Editor, refer to the documentation for the applications you are using to check if those applications support occurrences.

Related Topics

Difference between Occurrences and Instances

Defining Occurrence Bindings

Defining Occurrence Stop Points

Defining Occurrence-Level Bind-to-Open

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