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OK assuming 19.5Ksps is not violating spec then I don't see why you shouldn't get the mean quickly. Your accumulator will settle after 256 samples i.e. within msec(you have 19.5Ksps)
You better check in signaltap or simulation what is causing this delay. It should be easy as you can check sum and avg all the way through.
your accummulator bitwidth of 20 bits is just right (12 bits + 8bits = 20bits) so there is no overflow.
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Ok. I will check in the simulation what is causing the delay. But one thing I am confused is about those slowly incrementing values. I don't know why I see like 4mA, 8 mA, 16mA,,..... finally stable value of 100mA. I don't know why it is not just showing me 100mA directly.
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