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Нарисуйте, такой примитивный децимирующий CIC фильтр, c такой же параметризацией.
TITLE "p_rec_cic"; -- written by Petrov A. N. ux@yandex.ru
INCLUDE "lpm_ff.inc";
INCLUDE "lpm_add_sub.inc";
INCLUDE "altaccumulate.inc";
PARAMETERS
(
width_in = 3,
order = 2,
k_dec = 2 -- max coeff. of decimation
);
CONSTANT width_comb = CEIL(order*LOG2(k_dec)) + width_in;
CONSTANT width_sub = CEIL(order*LOG2(k_dec)) + width_in;
CONSTANT width_i = CEIL(order*LOG2(k_dec)) + width_in;
CONSTANT width_out = CEIL(order*LOG2(k_dec)) + width_in;
SUBDESIGN p_rec_cic
(
clk : INPUT;
enable : INPUT;
reset : INPUT; -- active HIGH
data_in[width_in-1..0] : INPUT;
ena_comb : INPUT;
data_out[width_out-1..0] : OUTPUT;
)
VARIABLE
comb[order-1..0] : lpm_ff
WITH
(
LPM_WIDTH = width_comb,
LPM_FFTYPE = "DFF"
);
sub_comb[order-1..0] : lpm_add_sub
WITH
(
LPM_WIDTH = width_sub,
LPM_REPRESENTATION = "SIGNED",
LPM_DIRECTION = "SUB",
ONE_INPUT_IS_CONSTANT = "YES",
LPM_PIPELINE = 1,
MAXIMIZE_SPEED = 0,
USE_WYS = "OFF"
);
integrator[order-1..0] : altaccumulate
WITH
(
WIDTH_IN = width_i,
WIDTH_OUT = width_i,
LPM_REPRESENTATION = "SIGNED",
EXTRA_LATENCY = 0,
USE_WYS = "ON"
);
BEGIN
comb[].clock = clk;
sub_comb[].clock = clk;
integrator[].clock = clk;
IF USED(enable) GENERATE
integrator[].clken = enable;
END GENERATE;
IF USED(reset) GENERATE
comb[].aclr = reset;
sub_comb[].aclr = reset;
integrator[].aclr = reset;
END GENERATE;
comb[].enable = ena_comb;
sub_comb[].clken = ena_comb;
integrator[0].data[width_in-1..0] = data_in[];
integrator[0].data[width_i-1..width_in] = data_in[width_in-1];
comb[0].data[] = integrator[order-1].result[];
sub_comb[0].dataa[] = integrator[order-1].result[];
sub_comb[0].datab[] = comb[0].q[];
FOR i IN 1 TO order-1 GENERATE
comb[i].data[] = sub_comb[i-1].result[];
sub_comb[i].dataa[] = sub_comb[i-1].result[];
sub_comb[i].datab[] = comb[i].q[];
integrator[i].data[] = integrator[i-1].result[];
END GENERATE;
data_out[] = sub_comb[order-1].result[];
END;
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