I'm not familiar with FPGA.
I want to build a frequency counter, and below is my RTL code:
The gate time is 1ms. (0.5ms gate = 1, and 0.5ms gate = 0)
And I use Function Generator to output a FM square wave, the carrier frequency is 60kHz, modulation frequency is 50Hz, and the frequency deviation is 10kHz.
The experiment result looks like this:
I don't think the output value = 29 or 31 is correct, but I have no idea why have these values.
Will the problem comes from Timing analysis? Because I don't know how to correctly constrain all the signal in my design.
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