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Hi,
One ALTPLL has about 5 outputs, since you are using the same reference frequency to generate the out freq., why don't use a single ALTPLL? instead of 4 PLLs.
Regards,
Uday
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Actually, one of the Cyclone 5 PLLs has up to 9 outputs. But the generated frequencies are restricted to a common divider. If you need frequencies which don't match this criteria you need different PLLs.
However, I solved my problem above, I forgott to connect a resistor to the RREF pin which then led to this very strange behaviour.
Oliver
Honored Contributor
