My purpose is to use the same node to generate square waves of different frequencies. This square wave has 13 cycles.I used the Flat sequence structure to create 5 frames. The first frame used an external trigger signal. The second frame had a built-in square wave generator in LABVIEW to generate a 10MHz signal for use by the FPGA I/O node. The third frame was The FPGA I/O node is shut down. In the fourth frame, there is another square wave generator built into LABVIEW, which generates a 20MHz signal for use by the FPGA I/O node. The fifth frame also shuts down the FPGA I/O node. I found that if the square wave generator frequencies of the second frame and the fourth frame are different, the signal will jitter left and right. What should I do? 10MHz20MHzcorrect signalshaking signalshaking signalmain

LabVIEW

LabView FPGA flat sequence structure CLOCK

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Thank you very much GerdW.
I tried using SCTL and got the signal I expected.
I learned a valuable lesson!

Thank you Bob for giving me very careful advice and lots of inspiration.
Thank you ZYOng. I will try the method you provided.

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LabVIEW

LabView FPGA flat sequence structure CLOCK

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