Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Cyclone II PLL - without wizard

Hi, I am trying to use the PLL blocks in a Cyclone II outside the limits of the megafunction wizard. I've pushed the VCO far outside the range by lying to it, and would like to access the p...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

--- Quote Start ---

so that I can run the input much slower.

--- Quote End ---

Sounds like a bad idea. The frequency limits aren't set by arbitrary restrictions of the MegaWizard rather than the physical limitations of the VCO and the PLL filter. Ignoring it must be expected to result in bad performance and possibly unstable PLL operation.