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Altera_Forum
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15 years ago

Fitter ignoring PLL compensation assignment as invalid

Hi all, Fitter ignoring PLL compensation (source synchronous mode) assignment as invalid. Any ideas as to why this may be happening? I am using Quartus v 10.1
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Are you using a Cyclone family device (as opposed to Stratix family)? I assume you are using the ALTLVDS MegaWizard in external PLL mode. Is that correct? What version of Quartus II are you using? You shouldn't see that in 10.1. Anyway, you want the PLL in Normal mode for this situation, although it shouldn't hurt you to be in Source Synchronous mode.