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CIC Megacore Function

Honored Contributor II

Hello everyone. I'm currently in my engineering thesis trying to implement in a FPGA a CIC Interpolation Filter. I've recentrly finished the design in fixed point using DSP Builder and i want to test my design and compare it with the CIC Megacore Function Block. 


This is what the documentation say: 


I read the documentation and tried to figure out how to connect the inputs of the CIC Megacore Function Block for a simple output. This is what i implemented: 




But this is what i get: 




The input signal is a sin wave but i only get square signal as output of the filter. 


I have MATLAB R2015a and DSP Builder running on Windows 7 64bit.
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