Forum Discussion

JHill1's avatar
JHill1
Icon for Occasional Contributor rankOccasional Contributor
5 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
5 years ago

Ok, so the obvious solution is to artificially add one more bit to the CIC input, sign extending the two's complement fixed point by one bit, and then Hogenauer pruning CIC output rounding option can be turned back on, and the anomalous/erroneous/non-determanistic CIC output value occurring in a DC linearity test for the single most negative fixed point input value is eliminated.