Why do I see a glitch when switching between coefficient sets with halfband filters?
There is a glitch in the switchover from one coefficient set to another when using multiple coefficient sets with halfband filters. The glitch is due to the new center tap coefficient being applied earlier than the rest of the new coefficients.
It is possible to avoid the glitch by halting data processing during the switchover period, as the glitch will only be evident if data is passed continuously to the core during the switchover.
This issue has been resolve in the FIR Compiler v2.0.
See (Xilinx Answer 29138) for a detailed list of LogiCORE FIR Compiler Release Notes and Known Issues.