Forum Discussion
jAlter
New Contributor
New ContributorSchmitt 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...
FvM
Super Contributor
Super ContributorHi,
I had an occasion to measure properties of MAX10 clock input and found above expected behaviour. A configured Schmitt Trigger feature also works on PLL input. I could specfically see that a low slew rate clock signal as shown below caused loss of PLL lock with 3.3V LVCMOS IO standard but runs fine with 3.3V Schmitt Trigger input.
Regards
Frank
jAlterNew Contributor
New ContributorVery useful test.
Thanks Frank,
