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Altera_Forum
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13 years ago

What is mean of rhis critical warning and how to handle it?

When I compile my design which use two plls in a EP4CE55F device, I have a cirtical warning as following: Critical Warning (176598): PLL "DSP_System:dsp_system|HistoComputeScene:histocomputesce...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

The error is pretty self-explanatory; you have fed your PLL from a pin that is not a dedicated clock pin that can be directly connected to the PLL, hence the jitter performance may be compromised.

The solution is to use a clock source that the PLL is happier with.

Cheers,

Dave