bitnode_behavioral.txt

LDPC码的消息节点（Bitnode）消息更新过程的VHDL语言实现

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity bitNode is
    Port (
		clock		: in STD_LOGIC;

		fromCheck0 	: in SIGNED(7 downto 0);
		fromCheck1 	: in SIGNED(7 downto 0);

		toCheck0 	: out SIGNED(7 downto 0);
        toCheck1 	: out SIGNED(7 downto 0);

		corrected	: out SIGNED(7 downto 0);
		init	 	: in STD_LOGIC;
		received 	: in SIGNED(7 downto 0)
	);
end bitNode;

architecture Behavioral of bitNode is
begin
	process(clock, init, received, fromCheck0, fromCheck1)
	VARIABLE correctedSignal : SIGNED(7 DOWNTO 0);
	VARIABLE toCheck0Signal : SIGNED(7 DOWNTO 0);
	VARIABLE toCheck1Signal : SIGNED(7 DOWNTO 0);
	begin
		if(clock'event and clock = '1') then
			if init = '1' then
				correctedSignal := received;
				toCheck0Signal := received;
				toCheck1Signal := received;
			else
				correctedSignal := fromCheck0 + fromCheck1 + received;
				toCheck0Signal := fromCheck1 + received;
				toCheck1Signal := fromCheck0 + received;
			end if;
		end if;
		corrected <= correctedSignal;
		toCheck0 <= toCheck0Signal;
		toCheck1 <= toCheck1Signal;
	end process;
end Behavioral;