At least one tool I have used is worthlessly inaccurate.
The software vendor finally admitted that they knew the tool didn't work
for the sort of application I was trying. In my estimation, my
application was something that *should* have worked, and if it didn't,
then any other result from that tool was suspect. I no longer use that
tool, and am seriously considering switching away from some of their
other simulation tools.
I have found it very difficult to prove whether or not a particular
simulation is accurate. It is also difficult to assess how accurate a
sim might be. Simulating digital systems is not as hard as simulating
the SI characteristics of those systems.
I can think of several reasons why that might be, including 'digital
systems are used to simulate themselves' for digital simulation, and
'discrete systems have difficulty simulating continuous events.'
I suppose the only way to be sure that a tool works most of the time is
to run multiple test cases on boards similar to the ones being designed.
-- Laurence Michaels Any technology distinguishable from magic is insufficiently advanced.
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