Digital_Laboratory/Hamming_Encoder.vhd at master · Radzyckyj/Digital_Laboratory · GitHub

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-- Polytechnic School of the University of Sao Paulo
-- Digital System and Computer Engineering Department
-- Digital Laboratory A - Experience 5
-- Hamming Encoder H(7,4)
-- Authors: Lucas Penna Saraiva and Stefan R. Raposo

entity Hamming_Encoder74 is
	port(
		binary: in bit_vector(3 downto 0);
		hamming: out bit_vector(6 downto 0)
		);
end entity;


architecture Behaviour of Hamming_Encoder74 is

	-- signal

	signal parity1 : bit;
	signal parity2 : bit;
	signal parity3 : bit;
	signal hamming_aux : bit_vector(6 downto 0);

	-- hamming encoding

	begin

	hamming_aux(0) <= binary(0);
	hamming_aux(1) <= binary(1);
	hamming_aux(2) <= binary(2);
	-- hamming(3) <= parity3
	hamming_aux(4) <= binary(3);
	-- hamming(5) <= parity2
	-- hamming(6) <= parity1

	-- parity determination

	parity3 <= hamming_aux(0) xor hamming_aux(1) xor hamming_aux(2);

	parity2 <= hamming_aux(4) xor hamming_aux(1) xor hamming_aux(0);

	parity1 <= hamming_aux(4) xor hamming_aux(2) xor hamming_aux(0);


	-- parity attribution

	hamming_aux(3) <= parity3;

	hamming_aux(5) <= parity2;

	hamming_aux(6) <= parity1;

	-- final attribution

	hamming <= hamming_aux;

end Behaviour;