控制信号的时序.doc

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1、实验程序：libraryieee;useieee.std_logic_1164.all;entityschkisport(din,clk,clr:instd_logic;ab:outstd_logic_vector(3downto0));endschk;architectureoneofschkissignalq:integerrange0to8;typepis(q0,q1,q2,q3,q4,q5,q6,q7,q8);signaljk,jn:p;signald:std_logic_vector(7downto0);begind<="11100101";so:process(clk,cl

2、r)beginifclr='1'thenjk<=q0;elsifclk='1'andclk'eventthenjk<=jn;endif;endprocess;co:process(jk,din)begincasejkiswhenq0=>q<=0;ifdin=d(7)thenjn<=q1;elsejn<=q0;endif;whenq1=>q<=1;ifdin=d(6)thenjn<=q2;elsejn<=q0;endif;whenq2=>q<=2;ifdin=d(5)thenjn<=q3;elsejn<=q0;endif;whenq3=>q<=3;ifdin=d(4)thenjn<=q4

3、;elsejn<=q0;endif;whenq4=>q<=4;ifdin=d(3)thenjn<=q5;elsejn<=q0;endif;whenq5=>q<=5;ifdin=d(2)thenjn<=q6;elsejn<=q0;endif;whenq6=>q<=6;ifdin=d(1)thenjn<=q7;elsejn<=q0;endif;whenq7=>q<=7;ifdin=d(0)thenjn<=q8;elsejn<=q0;endif;whenq8=>q<=8;jn<=q0;whenothers=>q<=0;jn<=q0;endcase;endprocess;process(q)b

4、eginifq=8thenab<="1010";elseab<="1011";endif;endprocess;endone;状态图