MAC FIR V3.0 POLYPAHSE DECIMATION

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Greetings DSP Guru's

Does anyone have experience with the Xilinx MAC FIR V3.0

I am interested in implementing a polyphase decimator.
The Xilinx data sheet is lacking in the timing department for the
polyphase decimator.
A simple simulation test seems to fail
Input a impulse -> output should equal the FIR coeffs.
The decimation is 4 and this is where the impulse is (@ sample 4)

The MAC FIR core works under this test without decimation.

Any insight would be appreciated.

Rgds
B.Onorato
 

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