Comparescan User Guide

Frequently Asked Questions

This command reloads the .Xdefaults file into the X server.

2. Restart Comparescan:

Exit Comparescan (select File—Exit), and then start Comparescan again.

Note: You only need to do these two operations when you change your .Xdefaults file and you want the changes to take effect immediately.

Comparescan Features

How can I compare a digital simulation with an analog simulation?

Use the threshold command.

How do I match an X value?

Use the statemapping command.

How do I compare only the top-level signals in my design?

Use the following command syntax:

compare filename -depth 1 -internal

How do I compare modules at different levels in the hierarchy?

Specify the two module names or signal names that you want to compare, as follows:

compare test.cpu.adder3 test.cpu.module2.module87.adder4

compare test.cpu.clk test.memory.refresh.clock

What if I want a different tolerance window for every signal?

You need to write a rules file that contains a different compare -tol statement for each signal, as follows:

compare -tol 45ns top.clk

compare -tol 30ns top.sum

compare -tol 15ns top.data