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I am new to FPGAs. I am working on a clone board that has a Spartan 3AN. There is a 30 MHz crystal oscillator on board.

I have checked another boards and noticed that 30 MHz is commmonly used.

Is there specific reason to use a 30 MHz clock frequency?

JRE
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Efe Badakal
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  • https://electronics.stackexchange.com/questions/130363/selecting-an-external-crystal-for-fpga – Syed Sep 22 '21 at 11:07
  • No specific engineering reason. – Andy aka Sep 22 '21 at 11:23
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    30 MHz isn't common in my experience. I usually see boards with 25/50/100 MHz oscillators. And there's nothing wrong with reworking a board to replace the oscillator with a more convenient frequency for your application. – Dave Tweed Sep 22 '21 at 11:39
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    That said, many FPGA's include PLL functionality, to essentially scale whatever crystal used to whatever clock frequency you want. If PLL jitter is critical in your application, then consider a different crystal. – rdtsc Sep 22 '21 at 11:55
  • 30 MHz? Ha weird choice I would say. All boards I worked on was 50/100. – Mitu Raj Nov 11 '21 at 18:25

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