Compare by Region
Clicking Compare > Add > Compare by Region in the Wave window opens the Add Comparison by Region window, where you can specify signals to be used in the comparison.
Region Data Tab
- Reference Region
Allows you to specify the reference region that will be used in the comparison.
- Test Region
Allows you to specify a test region that might have a different name from that of the reference region.
- Compare Signals of Type
Allows you to specify that All Types of signals will be used in the comparison or only Selected Types (In, Out, InOut, Internal, or Port).
- Recursive Search
Specifies whether to search for signals in the hierarchy below the selected region.
Comparison Method Tab
Allows you to select clocked or continuous comparison, and provides the capability to specify a "When" expression.
- Clocked Comparison
Allows you can select a clock from the drop-down history of past clock selections. Or, you can click the Clocks button to add a new clock.
Clicking the Clocks button opens the Comparison Clocks dialog box.
To add a signal, click the Add button to open the Add Clock dialog box, where you can define a clock signal name, a delay signal offset, the signal upon which the clock will be based, and whether the compare strobe edge will be the rising or falling edge or both. You can also use the Expression Builder to Specify a When Expression that must evaluate to "true" or 1 at the signal edge for the clock to become effective.
- Continuous Comparison
With the Continuous Comparison method you can set leading and trailing edge tolerances. The leading edge tolerance specifies how much earlier the test signal edge may occur before the reference signal edge. The trailing edge tolerance specifies how much later the test signal edge may occur after the reference signal edge. The default value for both tolerances is zero. In addition, these tolerances may be specified differently for each signal compared.
- Specify When Expression
Allows you to use "The GUI Expression Builder" to specify a when expression that must evaluate to "true" or 1 at the signal edge for the clock to become effective.
