The GUI Expression Builder

The GUI Expression Builder is a feature of the Wave and List Signal Search dialog boxes, and the List trigger properties dialog box. It aids in building a search expression that follows the "GUI_expression_format" .

To locate the Builder:

• select Edit > Search (List or Wave window)
• select the Search for Expression option in the resulting dialog box
• select the Builder button
  

The Expression Builder dialog box provides an array of buttons that help you build a GUI expression. For instance, rather than typing in a signal name, you can select the signal in the associated Wave or List window and press Insert Reference Signal in the Expression Builder. The result will be the full signal name added to the expression field. All Expression Builder buttons correspond to the "Expression syntax" .

To search for when a signal reaches a particular value

Select the signal in the Wave window and click Insert Reference Signal and ==. Then, click the value buttons or type a value.

To evaluate only on clock edges

Click the && button to AND this condition with the rest of the expression. Then select the clock in the Wave window and click Insert Reference Signal and `rising. You can also select the falling edge or both edges.

Operators

Other buttons will add operators of various kinds (see "Expression syntax" ), or you can type them in.

See"Setting up a List trigger with Expression Builder" for an additional Expression builder example.

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