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Do you know how the pruning algorithm might work with a variable rate.
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I didn't use the Altera CIC core up to now, I have my own basic CIC design. It's different from the Altera core in so far, that it's restricted to power of 2 decimation factors, but it has an automatic scaling for variable decimations factors. In this case, the pruning can be calculated for the highest R value and is valid for lower factors as well.
Without automatic scaling, you may loose significant bits in the intermediate stages (due to pruning) and in the final truncation/rounding step, I fear.
Honored Contributor
