原创 创建简单DO文件实例

Creating a Simple DO File
Creating DO files is as simple as typing the commands in a text file. Alternatively, you can save
the Main window transcript as a DO file. In this exercise, you will use the transcript to create a
DO file that adds signals to the Wave window, provides stimulus to those signals, and then
advances the simulation.
1. Load the test_counter design unit.
a. If necessary, start ModelSim.
b. Change to the directory you created in Lesson 2.
c. In the Library tab of the Workspace pane, double-click the test_counter design unit
to load it.
2. Enter commands to add signals to the Wave window, force signals, and run the
simulation.
a. Select File > New > Source > Do to create a new DO file.
b. Enter the following commands into the source window:
add wave count
add wave clk
add wave reset
force -freeze clk 0 0, 1 {50 ns} -r 100
force reset 1
run 100
force reset 0
run 300
force reset 1
run 400
force reset 0
run 200
3. Save the file.
a. Select File > Save As.
b. Type sim.do in the File name: field and save it to the current directory.
4. Load the simulation again and use the DO file.
a. Type quit -sim at the VSIM> prompt.
b. Type vsim test_counter at the ModelSim> prompt.
c. Type do sim.do at the VSIM> prompt.
ModelSim executes the saved commands and draws the waves in the Wave window.
5. When you are done with this exercise, select File > Quit to quit ModelSim.