Specifying tolerances

There may be times you want to allow for leading or trailing tolerances in the test dataset signals. You can do this easily by modifying the signal properties of a comparison object in the Wave window.

1. Click the Find Next Difference icon until you can see the differences at 2025 ns.




(KEYBOARD: Tab)

2. Select "compare:/top/prw" in the signals list and then open the Signal Properties dialog. Select the Compare tab.

(MENU: Edit > Signal Properties)

Recall that we delayed the read cycle in proc.v by 10 time units. Therefore, if we specify a trailing tolerance of 10 ns, the differences on the comparison object should disappear.

3. Specify 10 ns for the Trailing Tolerance and then click OK.


4. Rerun the comparison.

(MENU: Compare > Run Comparison)

5. Notice that the difference markers have disappeared for the /top/prw comparison object.
   


6. Quit the simulator.



quit -f 

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