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cRIO with NI 9222 and 9221 synchronize

Hi everyone,

 

I have a cRIO and NI 9222 and NI 9221, I wanna synchronize them.

at FPGA I got that sampling of the NI 9222 and 9221 for the same signal starts at the same timepoint ( data Daten von NI_9221/9222_Test 1-4).

but when I sample a square wave, NI 9222 and 9221 do not respond to flanks between "0" and "1" at the same time(data Daten von NI_9221/9222_Test 7-9)

Is it the problem of difference between devices? Or I need to optimize my code?

Thank you for your answer and I am looking forward to discussion

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