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JHill1
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4 years ago

ALtera/Intel CIC IP non-determanistic result when selecting Hogenauer pruning

Hi, I don't know where one might submit a bug report for the Intel FPGA IP so I submit one here. When I configure the Intel/Altera CIC Digital Filter IP for Hogenauer pruning I noticed that the s...
JHill1's avatar
JHill1
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

I tried narrowing my CIC output to 18 bits from 22 bits, but it does not fix (the problem that the single lowest signed two's complement input causes an anomalous output when Hogenauer pruning is enables in the CIC IP's output rounding option). Possibly, Intel's lookup table for the CIC IP internal number of CIC accumulator bits, is defective.

Maybe we have no choice other than to turn off Hogenauer pruning output rounding option, and use instead now the other low resource consuming option which is truncation.