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CIC Megacore Function

Altera_Forum
Honored Contributor II
‎03-03-2017 08:02 PM
1,493 Views

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: 

http://www.alteraforum.com/forum/attachment.php?attachmentid=13307&stc=1  

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: 

 

http://www.alteraforum.com/forum/attachment.php?attachmentid=13306&stc=1  

 

But this is what i get: 

 

http://www.alteraforum.com/forum/attachment.php?attachmentid=13308&stc=1  

 

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 16.0.1.218 running on Windows 7 64bit.
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