Technical data

Basic Verilog simulation

ModelSim EE Tutorial ModelSim EE Lessons

139

You will see a dot appear next to the line number. This indicates that a breakpoint

has been set for that line. Clicking line 30 once more would remove the breakpoint

but don’t do that now.

Select the

Run

button from the Main toolbar to resume execution of the simulation.

(PROMPT: run) (Main MENU: Run > Run 500 ns)

When the simulation hits the breakpoint, it stops running, highlights the Source

window with an arrow, and issues a message in the Main window.

Typically when a breakpoint is reached you will be interested in one or more signal

values. You have several options for checking values.

You can look at the values shown in the Signals window, you can move you

mouse pointer over the

count

variable in the Source window and press the right

mouse button, or you can use the

examine

command:

examine count

As a result of your command the count is output to the Main window.