?? bcdtob4.vhd
字號:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY BCDTOB4 IS
PORT
(
NUM :IN STD_LOGIC_VECTOR(3 DOWNTO 0);
CO :OUT STD_LOGIC_VECTOR(15 DOWNTO 0));
END;
ARCHITECTURE A OF BCDTOB4 IS
BEGIN
PROCESS
BEGIN
CASE NUM IS
WHEN"0000"=>CO<="0000000000000000";
WHEN"0001"=>CO<="0000001111101000";
WHEN"0010"=>CO<="0000011111010000";
WHEN"0011"=>CO<="0000101110111000";
WHEN"0100"=>CO<="0000111110100000";
WHEN"0101"=>CO<="0001001110001000";
WHEN"0110"=>CO<="0001011101110000";
WHEN"0111"=>CO<="0001101101011000";
WHEN"1000"=>CO<="0001111101000000";
WHEN"1001"=>CO<="0010001100101000";
WHEN OTHERS=>CO<="0000000000000000";
END CASE;
END PROCESS;
END;
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