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jAlter's avatar
jAlter
Icon for New Contributor rankNew Contributor
1 year ago

Schmitt Trigger at MAX10 PLL dedicated input

MAX 10 devices feature selectable Schmitt Trigger on all inputs. The question is if the dedicated PLL input pin is affected by the Schmitt Trigger when it is enabled, or if the PLL input bypasses the...
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FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
1 year ago

Hi,
ST is an IO-standard (e.g. 3.3-V Schmitt Trigger) assigned to the input pin. So if actually implemented, it applies to any function driven by the pad. Similarly, if you assign LVDS IO-standard to the pin, your PLL input becomes differential.

It's pointless to assume a path to PLL bypassing the input buffer. If at all, the ST function would be disabled by the fitter, but I can't believe that it's still consistenly flagged in Pin-Out file, Resource Porperty Editor, Fitter Report Resource Section.

Regards
Frank