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Title: Gate EMA accumulator on data_ena for multiplexed-stream use cases #1

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Title: Gate EMA accumulator on data_ena for multiplexed-stream use cases #1

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17 changes: 9 additions & 8 deletions src/lowpass_ema.vhd
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Original file line number Diff line number Diff line change
Expand Up @@ -162,18 +162,19 @@ BEGIN
average <= (OTHERS => '0');
average_ena <= '0';
ELSE
IF data_ena = '1' THEN
alpha_signed <= signed(alpha);
alpha_m <= alpha_max - alpha_signed;

alpha_signed <= signed(alpha);
alpha_m <= alpha_max - alpha_signed;
data_signed <= signed(data);

data_signed <= signed(data);
-- ema[n] = ( alpha*16*x[n]*16 + [1-alpha]*ema[n-1] ) / 256

-- ema[n] = ( alpha*16*x[n]*16 + [1-alpha]*ema[n-1] ) / 256
mult_data <= resize(data_signed * alpha_signed, PROD_W);
mult_sum <= resize(sum_shift * alpha_m , PROD_W);

mult_data <= resize(data_signed * alpha_signed, PROD_W);
mult_sum <= resize(sum_shift * alpha_m , PROD_W);

average <= std_logic_vector(resize(shift_right(sum, AVG_SHIFT), DATA_W));
average <= std_logic_vector(resize(shift_right(sum, AVG_SHIFT), DATA_W));
END IF;
average_ena <= data_ena;

END IF;
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