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let me put it this way. You are designing FIR filter based on an accumulator. This is done to save not just adders but multipliers.
What you need to do in fact is not what you are up to. use one multiplier then mux into it h0,x0 then h1,x1 ...etc and let result add up in an accumulator until you clear it. you will mux inputs and clear final sum based say on a running counter that counts number of taps.
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Yes a design a FIR design filter based on accumulator . For the multiplier and the adder are work very well and the result are saved on the table final_additions. The last block to do is to calculate the sum of this table which is the result of the filter. For the number of taps is defined as constant.
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