?? tone.vhd
字號(hào):
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY Tone IS
PORT ( Index : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
CODE : OUT INTEGER RANGE 0 TO 15;
HIGH : OUT STD_LOGIC;
Tone : OUT INTEGER RANGE 0 TO 16#7FF# );
END;
ARCHITECTURE one OF Tone IS
BEGIN
Search : PROCESS(Index)
BEGIN
CASE Index IS -- 譯碼電路,查表方式,控制音調(diào)的預(yù)置數(shù)
WHEN "00000001" => Tone <= 773; CODE <= 1; HIGH <= '0';
WHEN "00000010" => Tone <= 912; CODE <= 2; HIGH <= '0';
WHEN "00000100" => Tone <= 1036; CODE <= 3; HIGH <= '0';
WHEN "00001000" => Tone <= 1116; CODE <= 4; HIGH <= '0';
WHEN "00010000" => Tone <= 1197; CODE <= 5; HIGH <= '0';
WHEN "00100000" => Tone <= 1290; CODE <= 6; HIGH <= '0';
WHEN "01000000" => Tone <= 1372; CODE <= 7; HIGH <= '0';
WHEN "10000000" => Tone <= 1410; CODE <= 1; HIGH <= '1';
WHEN OTHERS => Tone <= 2047; CODE <= 0; HIGH <= '0';
END CASE;
END PROCESS;
END;
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