调用JK触发器的74Ls290程序
先编一个JK触发器带清0端，项目名称为dff_JK_111;
LIBRARY E; USE IEEE.D_LOGIC_1164.ALL; EITY Dff_JK_111 IS PORT (J,K:IN STD_LOGIC; clk,Rd,Sd: IN std_logic; Q:out std_logic); end Dff_JK_111; ARCHICTURE behave OF Dff_JK_111 IS signal S:STD_LOGIC; signal RS,JK:STD_LOGIC_vector(1 downto 0); begin JK<=J&K; RS<=Rd&Sd; process(J,K,clk,Rd,Sd,JK,RS) BEGIN if RS="11" then if clk'event and clk='0' Then case JK is when "00"=>S<=S; when "01"=>S<='0'; when "10"=>S<='1'; when "11"=>S<=not S; end case; end if; elsif RS="10" then S<='1'; elsif RS="01" then S<='0'; else Null; end if; end process; Q<= S ; end behave;
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