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Everything posted by Z3r0

  1. Hello, I have probably quite newbish question. I Would like to make something very simple to test my osiloscope frequency capabilities. So for example a 100 mhz square wave on one of the papilio outputs. The problem is that it seems the most I get is 32mhz and that is not square anymore, but sinusoidal I am able to configure DCM, addiding a counter after the DCM to slow down I can see that internaly papilio is working just fine on 100mhz. But not the output. I also saw that guys interface in quite high speeds with LVDS. So am I missing something or spartna 3E just can't handle any more than ~20MHz ? Tried to search forums/dataheet, but just can't find anything regarding frequency and IO. Any kind of information would be nice Thank you
  2. Z3r0

    Maximum IO switching speed?

    Yeah, link on signal fidelity posted by alvieboy speaks just about that. Well you live and learn. Atleast now I know how and why In anycase tried to output 91Mhz out of papilio, used 10x attentuation and a spring ground. Got a waveform (whatever form it was, still saw highs and lows), and got counted frequency value of 90,99Mhz and thats more than enough for me for next few years, and as I said now I know that spartan 3e is able to spit relative high frequency on its outputs and that I can't accuratly meassure them with my gear. So thank you guys for hellping a new guy out. Next to read and try out something with lvds signals
  3. Z3r0

    Maximum IO switching speed?

    Thank you for great resources. The scope is an hobyist level rigol http://www.rigolna.com/products/digital-oscilloscopes/ds1000e/ds1052e/ with hacked firmware of 100mhz version. Will definetly have some material to read on weekend