New Contributor
Super ContributorHi,
I would use on-board 50 MHz clock source for tests. If you need different clock frequency for a specific purpose, e.g. VGA controller, try to generate it with internal PLL. An external clock source can easily produce ringing edges or even overshoot outside maximum voltage ratings. For visualisation of simple logic, I'd refer to on-board switches and LEDs in the first place.
Don't know what you consider as "analog garbage" in your tests? How did you connect oscilloscope probes to the board?
Regards
Frank
New Contributor Thank you for the advice on using the internal clock. Already checked a few videos on how to use the internal PLL and it seems easy enough to set, so I will try it as soon as I can.
Sorry about the "analog garbage" term. What I meant is that I expected a clean Output since it has a Schmitt Tigger that it's going through, but instead it has all kind of noise in the signal and the frequency is all wrong as well. Most probably it's due to the ringing edges that you mentioned and it's messing up the whole thing.
As for the oscilloscope probe I had it connected to the common ground and the Output pin to check the voltage and frequency when I was testing the VGA H and V sync signals.
Warm regards,
Todor P.
