> I've been running signal integrity simulations on my board with PIC18F8621
> on it for some time now and one thought hit me.
> Do I really need it? Is 40MHz so fast to sun signal integrity simulations?
> So my question is: When is it really useful to run signal integrity
> simulations?

I would assume that the output from the simulations you have done so far
have given you some indication as to the need for them in your design.

Plus, since you've spent (eight to thirty) thousands of dollars for a PCB
package that includes signal integrity simulation, you should use it to
justify the expense.

If, however, you are using a "student" or "demo" version of the software,
you have by now learned how to use the signal integrity tool and no longer
need to use it on further PIC designs, but now have an extra skill to add
to your  resume or CV :)

Cheerful regards,

Bob



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