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Synchronizing the two Host FIFO with two FPGA FIFO for modulation propose

Hello everyone,

 

I've written code to make pulses and used them to modulate a sine wave using a sine waveform generator. I generate the pulses in a Single Cycle Time Loop and do the modulation with the sine wave in a simple While loop. I'm using myRIO FPGA, and its analog output can't be used in the Single Cycle Time Loop, so I use it in the While loop. Both FPGA FIFOs are used in the Single Cycle Time Loop. However, when I read back the data on the host, I find that the pulse and modulated sine wave aren't in phase with each other; there's some delay.

 

If anyone has experience with this issue, I'd appreciate your assistance. Please check out the screenshot of the modulated sine and pulse waveforms below.

 

Thanks and regards.

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The absence of code means an absence of pointers to what is wrong.....

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