簡單的JK觸發器
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY JKff_1 IS
  PORT (J,K:IN STD_LOGIC;
        clk : IN std_logic;
        Q: out STD_LOGIC);
end JKff_1;
ARCHITECTURE behave OF JKff_1 IS
signal S:STD_LOGIC;
  BEGIN
    S<= (J and (not S)) or (S and (not K))  when clk'event and clk='0' ;
    Q<=S ;
end  behave;

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