matrix_pkg.vhd

电子设计培训

LIBRARY ieee;
USE ieee.std_logic_1164.all;
PACKAGE matrix IS

    CONSTANT code_length : POSITIVE :=7 ;
    CONSTANT source_length : POSITIVE := 4;
	CONSTANT CHECK_LENGTH : POSITIVE :=CODE_LENGTH-SOURCE_LENGTH;

    TYPE MATRIX IS ARRAY(integer range<>, integer range<>) OF std_logic;

    CONSTANT G : MATRIX(0 to source_length-1,0 to CODE_LENGTH-1):=
        (('1', '0', '0', '0', '1', '1', '1'),
         ('0', '1', '0', '0', '1', '1', '0'),
         ('0', '0', '1', '0', '1', '0', '1'),
         ('0', '0', '0', '1', '0', '1', '1'));

	CONSTANT H : MATRIX(0 to CHECK_LENGTH-1, 0 to CODE_LENGTH-1):=
		(('1','1','1','0','1','0','0'),
		 ('1','1','0','1','0','1','0'),
		 ('1','0','1','1','0','0','1'));

	TYPE SYNMAT IS ARRAY(integer range<>) OF std_logic_vector(SOURCE_LENGTH-1 downto 0);

	CONSTANT C : SYNMAT(0 to 2**CHECK_LENGTH-1) :=
		(7=>"0001",3=>"0010",5=>"0100",6=>"1000",others=>"0000");
END matrix;