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The DSP48 Primitive - Behavioral Symmetric FIR Inference  The DSP48 primitive has an optional preadder function, which can be used to compute things like PCOUT=PCIN+(A+D)*B, which when used for implementing symmetric or anti-symmetric FIRs can reduce the number of multipliers used in half.   The following diagram shows how such a symmetric FIR is built using the case N=4, a symmetric FIR with 8 taps as an example: The forward data delay line is identical to the one for the non-sym ...

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