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Altera_Forum
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7 years ago

PLL Warnings appearing with Quartus Prime

Hi, I have three PLLs in my Cyclone V design. Since I moved from Quartus II v15.0.2 to Quartus Prime v17.1.1 I get these outlandish warnings appearing (see attached image). Does any one know w...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

Hi,

Looks like the cnt_sel[4:0] does not have any drivers. Due to this, the optimization tool has removed away the logic and signals associated with these 5 counter select lines. You should check if these 5 bits are being driven by any logic. If not, then you can ignore the warnings.