Technical data

Debugging a VHDL design

ModelSim EE Tutorial ModelSim EE Lessons

109

Once the simulation has restarted, add variables to the Variables window by selecting

the

test

/testbench

process in the Process window.

In the Variables window, expand

test_patterns

, and

test_pattern(6)

again. Then

highlight the

sum

record by clicking on the variable name (not the box before the

name) and then use the

Edit > Change

menu selection.

Select the last four bits in the value field

1000

by dragging the pointer across them.

Then replace them with

0111

, and click

Change

. (Note that this is a temporary edit,

you must use your text editor to permanently change the source code.)

Select the

Run

button from the Main toolbar.

(Main MENU: Run > Run 1000 ns) (PROMPT: run)

At this point, the simulation will run without any errors.

Next you will learn how to change the new-line triggering for the List window.