--- Quote Start ---
to add up 32 bits input in an integrator that outputs 34 bits here we go:
signal sum : std_logic_vector(33 downto 0) := (others => '0');
process(reset_n,clk)
if reset_n = '0' then
sum <= (others => '0');
elsif rising_edge(clk) then
sum <= std_logic_vector(signed(sum) + resize(signed(din),34));
end if;
end process;
dout <= sum;
--- Quote End ---
The code for the integrator is as below
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.numeric_std.ALL;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
library UNISIM;
use UNISIM.VComponents.all;
entity integrator is
port(
clk:in std_logic;
reset:in std_logic;
din:in std_logic_vector(32 downto 0)
--dout:out std_logic_vector(32 downto 0)
);
end integrator;
architecture Behavioral of integrator is
--signal ifilterout30:std_logic_vector(31 downto 0):=(others =>'0');
signal ifilterout31:std_logic_vector(32 downto 0):=(others =>'0');
signal ifilterout32:std_logic_vector(31 downto 0):=(others =>'0');
--signal ifilterout34:std_logic_vector(33 downto 0):=(others =>'0');
signal ifilterout33:std_logic_vector(33 downto 0):=(others =>'0');
begin
process(Clk,reset)
begin
if reset='0' then
ifilterout31<="000000000000000000000000000000000";
ifilterout33<="0000000000000000000000000000000000";
-- dout<="000000000000000000000000";
elsif clk'event and clk='1' then
-- ifilterout30 <= std_logic_vector(resize(signed(din),32));
ifilterout31 <= std_logic_vector(signed(din)+signed(ifilterout31));
ifilterout32 <=ifilterout31(31 downto 0);
-- ifilterout34 <= std_logic_vector(resize(signed(ifilterout32),34));
ifilterout33 <= std_logic_vector(resize(signed(ifilterout32),34)+signed(ifilterout33));
-- ifilterout34 <= std_logic_vector(resize(signed(ifilterout33),34));
-- ifilterout33 <= std_logic_vector(resize(signed( ifilterout32),34));
-- ifilterout32 <= std_logic_vector(resize(signed(ifilterout31),34));
-- dout <= ifilterout31;
-- ifilterout32 <= ifilterout31;
-- ifilterout32 <= ifilterout31;
end if;
end process ;
end Behavioral;
The final output ifilterout33 is coming as undefined . I tried as you said.But still there is problem in the output.
Honored Contributor
