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Can I use FlexRIO Controller 793x Ref Clock Input Port as a Digital Input Port?

I noticed I can access ReferenceClk10/Frontpanel IO in FlexRIO controller in FPGA (read only),But I'm not sure what kind of signal can I get from reading this port?

 

Will this give me a internal 10M ref clock data when I'm not wiring anything to this frontpanel IO? What's happens if i wired some other digital signal other then 10MClock in? Can I still use it as a Digital Input port?

 

Thanks!

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Well, I did the test on FlexRIO controller, sadly even if I connected a low frequency digital signal in the REF CLK port, I will still read a high speed filping counting signal in VI, should be a internal 10M clock or something like this.

 

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