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滑动滤波函数FPGA实用程序,对输入数据进行滑动滤波,可以减少干扰信号带来的影响。本实用程序设计上取4096个点进行滑动滤波,采样周期可以自行设定或修改。程序如下:+ S6 c+ c) t1 u, X, w. P
library ieee;
& \ I( B# m4 w$ G& r# ouse ieee.std_logic_1164.all;
& `7 O: Y4 ^; [use ieee.std_logic_arith.all;) B$ x- F9 i4 s
use ieee.std_logic_signed.all;- n7 P8 O7 r1 D5 ~8 W6 d
entity get_filter is
) `* L( F" a1 _, h5 r# r* f port# [ s @2 r) O( J& F
(
9 r g. q) K& T6 \7 b9 @/ V8 V1 W; Y clk: in std_logic;
1 n: Q4 B' X! S& [, u4 u rst: in std_logic;
1 k) l, m1 g/ Z6 Z: A- W clk1ms: in std_logic; 2 X+ d3 x7 r P, [1 B6 O" j+ Z
data: in std_logic_vector(15 downto 0);, Z: z4 w& D8 r
filter_result: out std_logic_vector(15 downto 0)
" D7 P% r( i9 x1 ~7 \ -- get_filter_state:buffer std_logic_vector(3 downto 0)# K# i# @; R( \& a5 ?: M, O' Y
);
( K) C/ q, f* U+ W. W) Pend get_filter;/ l3 `* ^' E% G- n
architecture arch_get_filter of get_filter is
: S. G! g7 P$ |, [: L6 d2 h* Xcomponent altsyncram
4 T, t1 Z+ f4 P3 `+ H generic (' O5 L9 y; e3 f7 b) E8 x
operation_mode : string;# P* T; O$ C9 J( ?, k! [) x
width_a : natural;0 _3 A b( f+ h# C, w5 S
widthad_a : natural;
! r! Z. I! ?" J; j6 E) r3 q' x" { width_b : natural;6 u; u' M5 I1 e9 O9 Y+ a
widthad_b : natural;
* R3 O7 o, d) P width_byteena_a : natural;4 ]' {# \7 U5 a
outdata_reg_b : string;
3 P1 _2 v4 L5 c/ v address_reg_b : string;
; `4 s9 j, g( ~' {: l' b1 T: [ rdcontrol_reg_b : string;# { P8 g3 U: D0 e
read_during_write_mode_mixed_ports : string;
7 u9 ^. F# R! }. Z- F$ A& A/ l" p# | init_file : string- X% O0 }3 [) {9 l: j% `3 y$ z, H
);
7 E' ]$ M3 I4 T9 u$ k* o$ c port
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wren_a : in std_logic ;' X5 T ]. l( n8 h+ z
clock0 : in std_logic ;) [' s* Z$ Q7 {$ \) C
clock1 : in std_logic ;8 q0 x3 z9 e; c
address_a : in std_logic_vector (widthad_a-1 downto 0);
2 Z0 n, n& y; V- X; n address_b : in std_logic_vector (widthad_b-1 downto 0);* n8 ]; t( }/ p+ q: Y0 \
rden_b : in std_logic ;
+ Q( }( k9 t2 F u& Z3 l, n q_b : out std_logic_vector (width_b-1 downto 0);
6 \# {* x1 S3 G data_a : in std_logic_vector (width_a-1 downto 0)
1 _% }4 M% K( Z0 f( t: u );
5 |% i' ^ B/ n end component;1 i+ k9 f: r8 T- G, W7 i' O: l7 m
signal sum: std_logic_vector(31 downto 0);
& t. M7 I4 A6 G- i1 E signal get_filter_wraddr: std_logic_vector(11 downto 0);
" p* R, O5 x" |6 g signal get_filter_rdaddr:std_logic_vector(11 downto 0);. y4 a! ^% x" ^5 c
signal get_filter_rd,get_filter_wr: std_logic;5 @! z& E- P: z) u$ T D6 m
signal get_filter_wrdata: std_logic_vector(15 downto 0);# z+ o, a6 g5 ?. u% K5 A
signal get_filter_rddata: std_logic_vector(15 downto 0);0 }. L' i1 A. Y z: C/ l" d, A
signal get_filter_state: std_logic_vector(3 downto 0);$ i- \) V' n% K
begin
( h4 A8 j: E0 ~8 i3 @9 \ -------all rx data buffer---------------------------------------
. @$ x: G: l0 s( U, Cget_filter_ram : altsyncram
7 ^. R. P( ^* g M8 t: p generic map
3 r, V* U8 S" F1 l (9 u4 P, f. R* `( c
operation_mode => "dual_port",( ^* N: }9 {) e+ b' y9 ~7 [& M$ V
width_a => 16,
3 i% y+ w' v/ \0 q3 r" e5 e widthad_a => 12,
1 \7 n' d3 |9 x4 ~4 g$ h- W width_b => 16,/ n# {4 S% S% k- W: _
widthad_b => 12,
# m1 a) P( i6 ~! B! I; X0 ~ width_byteena_a => 1,. q9 l- @& v0 ~+ N
outdata_reg_b => "unregistered",! P/ ~1 x: F, ~2 f
address_reg_b => "clock1",
, A' g, i" N# H: l rdcontrol_reg_b => "clock1",. F. u" w' j+ s; l
read_during_write_mode_mixed_ports => "old_data",! a. }0 i1 ?0 @# i+ m' \8 i
init_file =>"E:\JstHvfZkSoft\wavesim\get_pf.mif"
: o- M1 H3 b) d0 x* u )
+ q9 l7 v1 G2 S) `9 z3 b5 ~0 D2 U port map (- y7 L( X6 \3 W' v* Q; e0 E
wren_a => get_filter_wr, * A6 G' a* R7 V& ?
clock0 => clk,) l, j7 @% P# W$ D
clock1 => clk,
9 }( S" L$ ?4 D$ _ address_a => get_filter_wraddr,
7 k3 c% m* B8 r# ]3 d( J' U address_b => get_filter_rdaddr,
9 i/ n" ^% h! h2 ?% j4 H! g rden_b => get_filter_rd, * a, D6 ? B( ~- D
data_a => get_filter_wrdata,
, |% o3 j( p1 c' [+ y, A q_b => get_filter_rddata 8 d5 h- \. t1 ?( @) L) S7 m
);
0 c& H& a. a, q' _* \% S2 d7 i process(clk,rst)" A! j5 k! i: C+ ~1 p; X$ Z
begin
( E) Q+ W; m2 i+ m if (rst='0') then
5 ~! ?' Q- z% R0 p5 m, _# U: l get_filter_wraddr<=(others=>'1');
$ m0 u J$ x9 Q$ g$ a get_filter_rdaddr<=(others=>'0');
8 `, @/ l* y, N) } get_filter_wrdata<=(others=>'0');
# ^) j8 a$ e, ]' G) B* O# m" [ get_filter_rd<='0';
6 ~) N, j9 q$ P8 O ^9 s! f7 s( F get_filter_wr<='0'; + P" }( w* E: r, r* e% t9 |* c k
get_filter_state<=(others=>'0');: g$ V! _5 [6 s* w$ T2 v
elsif clk'event and clk='1' then- j; A9 n4 x2 q( x9 Q! k+ t
if (get_filter_state="0000") then& p- Y; c. z0 x& h. l+ i
sum<=(others=>'0');
' Z$ P) E7 y- q5 I9 x0 ?/ a$ ` get_filter_rd<='1';
4 o( k- H: `6 {% I m% w get_filter_rdaddr<=get_filter_rdaddr+'1';/ o$ s- F/ n) ?9 _1 `" L
get_filter_state<="0001";
) Z1 n( v* ^& }8 t0 Z! j elsif (get_filter_state="0001") then8 m! m! B: w! G$ B G( Y4 M F
get_filter_rdaddr<=get_filter_rdaddr+'1';: ^6 [# I W/ P, Z+ Z1 w/ }7 L
get_filter_state<="0010"; ) K% G, W/ U& ?
elsif (get_filter_state="0010") then
1 o3 M) X" H: G/ t' W( L- Z8 Y; F get_filter_wr<='1';
' d- o0 K l: d0 t: j" {) [ get_filter_wraddr<=get_filter_wraddr+'1'; ^' h1 [3 }6 y- m$ \5 }8 L( i
if (get_filter_rdaddr/=x"fff")then
6 y, U' @ u' ^2 o1 ~: ]0 } get_filter_rdaddr<=get_filter_rdaddr+'1';; G- x8 p' N# {
end if;
9 T* ^+ g- M) I get_filter_wrdata<=get_filter_rddata;. j4 t+ D5 X8 r9 }, h
sum<=sum+(get_filter_rddata(15)& get_filter_rddata(15)&get_filter_rddata(15)&get_filter_rddata(15)
7 I5 f( T" u, E, f7 J8 X5 h &get_filter_rddata(15)&get_filter_rddata(15)&get_filter_rddata(15)&get_filter_rddata(15)&get_filter_rddata);: n: Y6 Q$ U7 ^3 U! q |% ?
--- filter_result<=get_filter_rddata; -----used in test!* R5 h8 j' p% W& W3 S
if (get_filter_wraddr=x"ffd") then
6 ` e% ?" \, P9 O, }# u8 m get_filter_state<="0011";/ X1 T h. n3 f
get_filter_rd<='0';
) T* i5 k0 q8 B" ? end if;6 |4 e9 e$ v) G- G* p8 j) @
elsif (get_filter_state="0011") then
# l! b: Z) U# E- C% R sum<=sum+(data(15)& data(15)&data(15)&data(15)3 g/ ?4 o2 X* b# v' ]$ l
&data(15)&data(15)&data(15)&data(15)&data);% Q( V0 d+ j" j
--- filter_result<=data; -----used in test!8 x5 E8 }! _8 O( `5 A! n
get_filter_rdaddr<=(others=>'0');& _5 C% a4 X' u8 L
get_filter_wraddr<=get_filter_wraddr+'1'; ' R8 w. K/ e, M3 R% c' l' \ f
get_filter_wrdata<=data; 1 B+ @8 ^, B4 [* r0 @1 [
get_filter_state<="0100";" R$ b4 G' h: F ?0 L
/ F2 {1 Q5 x [
elsif (get_filter_state="0100") then
+ C. ?2 {4 V% i- z filter_result<=sum(27 downto 12);: r% H' g9 ~5 d2 a8 Q
-- if (clk1ms='1') then
8 k5 Z' S+ @8 U! g& ^5 m% K get_filter_state<="0000";2 B) R* G* g- X0 b/ A9 F/ ?
-- end if;
( P! p0 g/ G" L/ ]8 B. ] else6 j9 x; F7 w, G4 R( W
get_filter_state<="0000";5 ?5 l8 W4 g- U3 }5 u/ t
end if;( j' Z3 q0 z* q- Y9 l
end if;' q& t: W) v) Q7 _
end process;
; [4 G6 Z6 g0 r, O end arch_get_filter;
; d) }' Z, G" B7 f; s$ c* O2 @9 b5 n1 z7 o8 ^1 ]) K
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