Please see the attached file. It's a 10's complement for 4-bit BCD.
I have a 4-bit vector input, and 4-bit vector output. But, the vector input is not showing the correct binary number. It shows all 0000, although the waveform show the correct input that I key in.
How to display the correct vector input in this "Wave" window?
There's something wrong with that group in the Wave view. As you can see in the Objects pane, D is correct there. Remove what you have in the Wave view and then click and drag D from the Objects pane to the Wave view.
Thanks for suggestion.
First, I couldn't load / open the wave that I saved yesterday. How do I open the wave (those inputs signals that I put in earlier)?
I have saved the wave in .do file.
Do you mean to provide input stimulus? If so, you can right click the D in the wave window, select force and insert value. Then run simulation.
Insert one by one will become a tedious job, instead you can insert example line in the transcript.
VSIM> force -deposit /D 2#0, 2#1 20, 2#0 40, 2#1 60, 2#1 80
VSIM> run 200 ns
the line change D to binary value 0 (2#0) starting from time instant now. Then, 20 ns later, change the input to 1 (2#1 20).
I recommend to start a new project and key in the same input again. It seems that the Edit/: wave group from wave.do could be what's left from the last project.
Simulate the addern in work project, insert command [add wave *], provide the input and run the simulation.
Now I get what you mean by that. It seems that the input only responds to the most significant bit with the remaining bits being 0.
Not sure why the input display does not match. Might need to ask Mentor on this.
If you simulate the waveform, I believe the input will display correctly.
You can simulate by right click the input waveform that you want to simulate e.g. X , Y.
Go to Edit > Waveform Editor > Export Waveform. Save as force file e.g wave.do
Start simulate the addern.v file. [ vsim work.addern ]
Insert command [ add wave * ]
Insert command [ do wave.do ]
Insert command [ run -all ]