filter3_coef.vhd

数字均衡器是通讯信道抗码间干扰的重要环节,这是一个用vhdl写的代码以及用SYNPLIFY8.0综合的RTL电路图 它包含三个模块FILTER,ERR_DECISION,ADJUST 希望对大家有用.

library ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_unsigned.all;
USE work.equ_pak.all;

ENTITY filter3_coef IS
GENERIC(n: positive:=3);
PORT(clk: in std_logic;
resetn: in std_logic:='1';
addr_st: in std_logic:='0';
ram_ch:in std_logic:='0';
ram_addr:in std_logic_vector(n-1 downto 0):="000";
ch_addr: in std_logic_vector(n-1 downto 0):="000";
data :in std_logic_vector(15 downto 0):=(others=>'0');
ram_out:out std_logic_vector(15 downto 0);
coefout: out std_logic);
END filter3_coef;

ARCHITECTURE rt1 OF filter3_coef IS
SIGNAL q_array:coef_array(2**n-1 downto 0);
SIGNAL data_m:std_logic_vector(15 downto 0);
SIGNAL write_s:std_logic;
SIGNAL ramout_tm:std_logic_vector(15 downto 0);
SIGNAL ram_ch_add:std_logic;
SIGNAL ch_addr_m1:std_logic_vector(2 downto 0);
SIGNAL ch_addr_m2:std_logic_vector(2 downto 0);
SIGNAL datam:std_logic_vector(15 downto 0);
SIGNAL ram_addrm:std_logic_vector(2 downto 0);
SIGNAL ch_addrm:std_logic_vector(2 downto 0);
SIGNAL addr_stm,ram_chm:std_logic;
BEGIN
writ: process(clk,resetn)
begin
if resetn='0' then
for i in 2**n-1 downto 0 loop
q_array(i)<=(others=>'0');
end loop;
elsif clk'event and clk='1' then
if write_s='1' then
case ch_addr_m2 is
when "000"=>q_array(0)<=data_m;
when "001"=>q_array(1)<=data_m;
when "010"=>q_array(2)<=data_m;
when "011"=>q_array(3)<=data_m;
when "100"=>q_array(4)<=data_m;
when "101"=>q_array(5)<=data_m;
when "110"=>q_array(6)<=data_m;
when others=>q_array(7)<=data_m;
end case;
end if;
end if;
end process;
read1:process(clk,resetn)
begin
if resetn='0' then
ram_out<=(others=>'0');
coefout<='0';
ram_addrm<="000";
elsif clk'event and clk='1' then
ram_addrm<=ram_addr;
if addr_stm='1' and ram_chm='0' then
case ram_addrm is
when "000"=>ram_out<=q_array(0);
when "001"=>ram_out<=q_array(1);
when "010"=>ram_out<=q_array(2);
when "011"=>ram_out<=q_array(3);
when "100"=>ram_out<=q_array(4);
when "101"=>ram_out<=q_array(5);
when "110"=>ram_out<=q_array(6);
when others=>ram_out<=q_array(7);
end case;
coefout<='1';
else
ram_out<=(others=>'0');
coefout<='0';
end if;
end if;
end process;

read2: process(clk, resetn)
begin
if resetn='0' then
ramout_tm<=(others=>'0');
ch_addr_m1<=(others=>'0');
ch_addrm<="000";
elsif clk'event and clk='1' then
if ram_chm='1' then
ch_addrm<=ch_addr;
case ch_addrm is
when "000"=>ramout_tm<=q_array(0);
when "001"=>ramout_tm<=q_array(1);
when "010"=>ramout_tm<=q_array(2);
when "011"=>ramout_tm<=q_array(3);
when "100"=>ramout_tm<=q_array(4);
when "101"=>ramout_tm<=q_array(5);
when "110"=>ramout_tm<=q_array(6);
when others=>ramout_tm<=q_array(7);
end case;
ch_addr_m1<=ch_addrm;
else
ramout_tm<=(others=>'0');
ch_addr_m1<=(others=>'0');
end if;
end if;
end process;


addpro:process(clk,resetn)
variable m_result:std_logic_vector(16 downto 0);
begin
if resetn='0' then
write_s<='0';
data_m<=(others=>'0');
ch_addr_m2<=(others=>'0');
ram_ch_add<='0';
datam<=(others=>'0');
elsif clk'event and clk='1' then
ram_ch_add<=ram_ch;
ch_addr_m2<=ch_addr_m1;
datam<=data;
if ram_ch_add='1' then
m_result:='0'&ramout_tm+datam;
data_m<=m_result(16 downto 1);
write_s<='1';
else
data_m<=(others=>'0');
write_s<='0';
end if;
end if;
end process;



process(clk,resetn)
begin
if resetn='0' then
addr_stm<='0';
ram_chm<='0';
elsif clk'event and clk='1' then
addr_stm<=addr_st;
ram_chm<=ram_ch;
end if;
end process;
end rt1;