Setting signal breakpoints

You can set signal breakpoints (a.k.a., when breakpoints; see the when command for more details) via a context menu in the Signal window. When statements instruct ModelSim to perform actions when the specified conditions are met. For example, you can break on a signal value or at a specific simulator time (see "Time-based breakpoints" ). When a breakpoint is hit, a message appears in the transcript window about which signal caused the breakpoint.

To access the breakpoint commands, select a signal and then click your right mouse button (2nd button in Windows; 3rd button in UNIX). To set a breakpoint on a selected signal, select Add Breakpoint from the context menu. To remove a breakpoint from a selected signal, select Remove Signal Breakpoint. To remove all breakpoints in the current region, select Remove All Signal Breakpoints. To see a list of currently set breakpoints, select Show Breakpoints.

The Edit Breakpoint command opens the Edit When dialog box.

The Edit When dialog includes the following options:

• Condition
  The condition(s) to be met for the specified command(s) to be executed. Required. See the when command for more information on creating the condition statement.
• Opt. Label
  An optional text label for the when statement.
• Command(s)
  The command(s) to be executed when the specified condition is met. Any ModelSim or Tcl command or series of commands are valid with one exception-the run command cannot be used.

The Edit All Breakpoints command opens the Breakpoints dialog box. See "Setting file-line breakpoints" for details.

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