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vhdl code for FIR Filter using wave-pipelining

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deepthi.reddy.912

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Hello,

I am doing my project on Wave-pipelining asynchronous circuits using FPGA.I am implementing the concepts of non-pipelining,pipelining and wave-pipelining on 4-tap FIR filter and doing comparisions on power consumption,area etc.
I am facing a problem in applying pipelining and wave-pipelining for 4-tap FIR Filter while coding in vhdl.Following is my code for non-pipelined 4-tap FIR Filter.Kindly help me how to modify this for pipelining and wave-pipelining.
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;


entity fir_4_tab is
port (clk,rst:in std_logic;
data_in:in std_logic_vector(7 downto 0);
data_out:eek:ut std_logic_vector(18 downto 0));
end fir_4_tab;

architecture fir_arch of fir_4_tab is
component shift_block
port (clk,rst:in std_logic;
data_in:in std_logic_vector( 7 downto 0);
data_out:eek:ut std_logic_vector( 7 downto 0));
end component;

component ROM
port (clk,rst:in std_logic;
Addr :in std_logic_vector(3 downto 0);
rom_data : out std_logic_vector(7 downto 0));
end component;

component c_l_addr_16
PORT
(
x_in : IN STD_LOGIC_VECTOR(15 DOWNTO 0);
y_in : IN STD_LOGIC_VECTOR(15 DOWNTO 0);
ADD_OUT : OUT STD_LOGIC_VECTOR(16 DOWNTO 0));
END component;

component c_l_addr_17
PORT
(
x_in : IN STD_LOGIC_VECTOR(16 DOWNTO 0);
y_in : IN STD_LOGIC_VECTOR(16 DOWNTO 0);
ADD_OUT : OUT STD_LOGIC_VECTOR(17 DOWNTO 0));
END component;

component c_l_addr_18
PORT
(
x_in : IN STD_LOGIC_VECTOR(17 DOWNTO 0);
y_in : IN STD_LOGIC_VECTOR(17 DOWNTO 0);
ADD_OUT : OUT STD_LOGIC_VECTOR(18 DOWNTO 0));
END component;

component DFF_CLK
generic (data_length: positive:=16);
port (rst:in std_logic;
clk:in std_logic;
D_in:in std_logic_vector(data_length -1 downto 0);
Q_out:eek:ut std_logic_vector(data_length-1 downto 0));
end component;

-------------------------------------------------------------
signal tab_1:std_logic_vector(7 downto 0);
signal tab_2:std_logic_vector(7 downto 0);
signal tab_3:std_logic_vector(7 downto 0);
signal tab_4:std_logic_vector(7 downto 0);

signal rom_addr_0:std_logic_vector(3 downto 0);
signal rom_addr_1:std_logic_vector(3 downto 0);
signal rom_addr_2:std_logic_vector(3 downto 0);
signal rom_addr_3:std_logic_vector(3 downto 0);
signal rom_addr_4:std_logic_vector(3 downto 0);
signal rom_addr_5:std_logic_vector(3 downto 0);
signal rom_addr_6:std_logic_vector(3 downto 0);
signal rom_addr_7:std_logic_vector(3 downto 0);

signal rom_out_1:std_logic_vector(7 downto 0);
signal rom_out_2:std_logic_vector(7 downto 0);
signal rom_out_3:std_logic_vector(7 downto 0);
signal rom_out_4:std_logic_vector(7 downto 0);
signal rom_out_5:std_logic_vector(7 downto 0);
signal rom_out_6:std_logic_vector(7 downto 0);
signal rom_out_7:std_logic_vector(7 downto 0);
signal rom_out_8:std_logic_vector(7 downto 0);

signal adder_1 :std_logic_vector(16 downto 0);
signal adder_2 :std_logic_vector(16 downto 0);
signal adder_3 :std_logic_vector(16 downto 0);
signal adder_4 :std_logic_vector(16 downto 0);

--signal d_adder_1 :std_logic_vector(16 downto 0);
--signal d_adder_2 :std_logic_vector(16 downto 0);
--signal d_adder_3 :std_logic_vector(16 downto 0);
--signal d_adder_4 :std_logic_vector(16 downto 0);
--

signal adder_5 :std_logic_vector(17 downto 0);
signal adder_6 :std_logic_vector(17 downto 0);

signal adder_7 :std_logic_vector(18 downto 0);

--signal d_adder_5 :std_logic_vector(17 downto 0);
--signal d_adder_6 :std_logic_vector(17 downto 0);


signal shift_1:std_logic_vector(15 downto 0);
signal shift_2:std_logic_vector(15 downto 0);
signal shift_3:std_logic_vector(15 downto 0);
signal shift_4:std_logic_vector(15 downto 0);
signal shift_5:std_logic_vector(15 downto 0);
signal shift_6:std_logic_vector(15 downto 0);
signal shift_7:std_logic_vector(15 downto 0);
signal shift_8:std_logic_vector(15 downto 0);

--signal d_shift_1:std_logic_vector(15 downto 0);
--signal d_shift_2:std_logic_vector(15 downto 0);
--signal d_shift_3:std_logic_vector(15 downto 0);
--signal d_shift_4:std_logic_vector(15 downto 0);
--signal d_shift_5:std_logic_vector(15 downto 0);
--signal d_shift_6:std_logic_vector(15 downto 0);
--signal d_shift_7:std_logic_vector(15 downto 0);
--signal d_shift_8:std_logic_vector(15 downto 0);

begin
----------------------------------------------------------------
stage_1:shift_block port map(clk,rst,data_in,tab_1) ;
stage_2:shift_block port map(clk,rst,tab_1,tab_2) ;
stage_3:shift_block port map(clk,rst,tab_2,tab_3) ;
stage_4:shift_block port map(clk,rst,tab_3,tab_4) ;
------------------------------------------------------------------------
rom_addr_0<=tab_4(0) & tab_3(0) & tab_2(0) & tab_1(0);
rom_addr_1<=tab_4(1) & tab_3(1) & tab_2(1) & tab_1(1);
rom_addr_2<=tab_4(2) & tab_3(2) & tab_2(2) & tab_1(2);
rom_addr_3<=tab_4(3) & tab_3(3) & tab_2(3) & tab_1(3);
rom_addr_4<=tab_4(4) & tab_3(4) & tab_2(4) & tab_1(4);
rom_addr_5<=tab_4(5) & tab_3(5) & tab_2(5) & tab_1(5);
rom_addr_6<=tab_4(6) & tab_3(6) & tab_2(6) & tab_1(6);
rom_addr_7<=tab_4(7) & tab_3(7) & tab_2(7) & tab_1(7);

rom_1:ROM port map (clk,rst,rom_addr_0,rom_out_1);
rom_2:ROM port map (clk,rst,rom_addr_1,rom_out_2);
rom_3:ROM port map (clk,rst,rom_addr_2,rom_out_3);
rom_4:ROM port map (clk,rst,rom_addr_3,rom_out_4);
rom_5:ROM port map (clk,rst,rom_addr_4,rom_out_5);
rom_6:ROM port map (clk,rst,rom_addr_5,rom_out_6);
rom_7:ROM port map (clk,rst,rom_addr_6,rom_out_7);
rom_8:ROM port map (clk,rst,rom_addr_7,rom_out_8);
----------------------------------------------------------------------


-----------------------------------------------------------------------
shift_1<="0000000" & rom_out_1 & '0';
shift_2<="000000" & rom_out_1 & "00";
shift_3<="00000" & rom_out_1 & "000";
shift_4<="0000" & rom_out_1 & "0000";
shift_5<="000" & rom_out_1 & "00000";
shift_6<="00" & rom_out_1 & "000000";
shift_7<="0" & rom_out_1 & "0000000";
shift_8<= rom_out_1 & "00000000";
------------------------------------------------------------------------
--DFF_1 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_1,d_shift_1);
--DFF_2 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_2,d_shift_2);
--DFF_3 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_3,d_shift_3);
--DFF_4 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_4,d_shift_4);
--DFF_5 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_5,d_shift_5);
--DFF_6 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_6,d_shift_6);
--DFF_7 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_7,d_shift_7);
--DFF_8 :DFF_CLK generic map (data_length => 16) port map(rst,clk,shift_8,d_shift_8);
------------------------------------------------------------------------
add_1:c_l_addr_16 port map(shift_1,shift_2,adder_1);
add_2:c_l_addr_16 port map(shift_3,shift_4,adder_2);
add_3:c_l_addr_16 port map(shift_5,shift_6,adder_3);
add_4:c_l_addr_16 port map(shift_7,shift_8,adder_4);
------------------------------------------------------------------------
--DFF_9 :DFF_CLK generic map (data_length => 17) port map(rst,clk,adder_1,d_adder_1);
--DFF_10 :DFF_CLK generic map (data_length => 17) port map(rst,clk,adder_2,d_adder_2);
--DFF_11 :DFF_CLK generic map (data_length => 17) port map(rst,clk,adder_3,d_adder_3);
--DFF_12 :DFF_CLK generic map (data_length => 17) port map(rst,clk,adder_4,d_adder_4);
-------------------------------------------------------------------------
add_5:c_l_addr_17 port map(adder_1,adder_2,adder_5);
add_6:c_l_addr_17 port map(adder_3,adder_4,adder_6);
---------------------------------------------------------------------------
--DFF_13 :DFF_CLK generic map (data_length => 18) port map(rst,clk,adder_5,d_adder_5);
--DFF_14 :DFF_CLK generic map (data_length => 18) port map(rst,clk,adder_6,d_adder_6);
-----------------------------------------------------------------------------
add_7:c_l_addr_18 port map(adder_5,adder_6,data_out);
--------------------------------------------------------
--DFF_15 :DFF_CLK generic map (data_length => 19) port map(rst,clk,adder_7,data_out);
--------------------------------------------------------------------------------
end fir_arch;
 

shopi Ram

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what is a wave pipelining????? can u suggest me some links????
 

rithanya

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wave pipelining is also known as maximum rate pipelining ,where the speed of the circuit depends on difference between longest and shortest path delay rather than depending on longest path delay.
u can find the basics of wave pipelining in ieee paper tutorial and research survey on wave pipelining.
 

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