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bombik's avatar
bombik
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1 year ago

clocking GPIO

hello, tell me, I have a question about DE1-SoC. Is it possible to use custom GPIOs as clock output sources? and how? I need a frequency of 13 Mhz. There is also a serious question about the stabilit...
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FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
1 year ago
Hi,
you can send PLL generated clock to GPIO output. Quartus generates a warning that you don't use dedicated clock output, which should be ignored. Generated clock has stability of DE1-SoC 25 MHz crystal oscillator with some additional jitter.
  • bombik's avatar
    bombik
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    1 year ago

    Thank you for responding. The question now is, do all GPIO pins fit the clock source? If not all, which one is better to use? Now I need 60 Mhz from this contact