Always use ACTIVE-LOW reset signals!
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Posted by Michael van Dam on January 21, 1998 at 17:02:13:
In certain circumstances, there is a bug in MaxPlus+II
which does not correctly implement active-high reset
signals. Unfortunately, when you use active-high resets,
the simulation gives you correct results; but when you
program the chip, you will usually discover that it does
not work.(The problem has something to do with the fact that the
lowest level flip-flop primitive, dff, has an active-low
clear signal.)
To be on the safe side, ALWAYS make your reset signals
ACTIVE-LOW. (i.e. They cause a reset when they go to
zero.)
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