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FMC112 continuous data acquisition


I've a problem on FMC112 continuous data acquisition.

My wave is a square pulse train with pulse width of 1 ms and pulse period of 4 ms. On a regular basis, I'm seeing the ADC output is not working continuously. attachment is showing the situation using chipscope.

In order to make it continuous, I made the following change to the reference design:

unlim_bursts <= '1';

Is there something I'm missing???

I also removed chipscope cores to see whether it might be the cause, but I'm seeing the same problem on PC side (after data acquisition in PC using ethernet--I'm pretty sure chipscope is not the cause)

Thanks for your support.

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