交通灯VHDL语言程序源代码

1、交通灯控制器的设计智能交通灯控制器的源程序如下:library ieee;entity traffic_control isport( clk: in std_logic;sense0,sense1: in std_logic; -分别为东西路和南北路车辆指示器counter: out integer range 0 to 44;r0,y0,g0: out std_logic; -r0,y0,g0为南北路的红、黄、绿灯r1,y1,g1:out std_logic; -r1,y1,g1为东西路的红、黄、绿灯end;architecture art of traffic_control2 issi

2、gnal state:std_logic_vector(1 downto 0;signal cnt:integer range 0 to 44;beginprocess(clkvariable nclr,en:bit; -nclr为倒计时计数器清零端,en为计数器使能端beginif clk'event and clk='1' thenif nclr='0' thencnt<=0; -同步清零elsif en='0'thencnt<=cnt; -计数器停止计数elsecnt<=cnt+1; -计数器值增加end if;c

3、ase state iswhen "00"=>r0<='1'y0<='0'g0<='0'r1<='0'y1<='0'g1<='1'if(sense0 and sense1='1' then -东西道和南北道都有车if cnt=44 thenstate<="01"nclr:='0'en:='0'elsestate<="00"nclr:=

4、9;1'en:='1'end if;elsif(sense0 and (not sense1='1' then -东西道有车,南北道无车state<="01"nclr:='0'en:='0'elsestate<="00"nclr:='1'en:='1'end if;when "01"=>r0<='1'y0<='0'g0<='0'r1<='

5、;0'y1<='1'g1<='0'if cnt=5 thenstate<="10"nclr:='0'en:='0'elsestate<="01"nclr:='1'en:='1'end if;when "10"=>r0<='0'y0<='0'g0<='1'r1<='1'y1<='0'g1<=

6、'0'if(sense0 and sense1='1' then -东西道和南北道都有车if cnt=29 thenstate<="11"nclr:='0'en:='0'elsestate<="10"nclr:='1'en:='1'end if;elsif sense0 ='0' then -东西道有车,南北道无车state<="11"nclr:='0'en:='0'elsestate<="10"nclr:='1'en:='1'end if;when "11"=>r0<='1'y0<='1'g0<='0'r1<='1'y1<='0'g1<='0'if cnt=5 thenstate<="00"nclr:='0'en:='0'elsestate&