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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

Okay. If you are using the ALTLVDS in Internal PLL mode, then you cannot change the feedback mode. It is set to Normal by the tool (at least it should be, and I confirmed this in version 10.1). Perhaps you are using an older version of Quartus II and this was a bug that got fixed, or you are using the External PLL mode and where the user can change the mode.