交通灯控制器-VHDL语言编写代码.pdf

--Title:交通灯控制器--

--Author:PanHongtao--

--Data:2006-10-1--

libraryieee;

useieee.std_logic_1164.all;

useieee.std_logic_arith.all;

useieee.std_logic_unsigned.all;

entityexp18is

port(Clk:instd_logic;--时钟输入

Rst:instd_logic;--复位输入

R1,R2:outstd_logic;--红灯输出

Y1,Y2:outstd_logic;--黄灯输出

G1,G2:outstd_logic;--绿灯输出

Display:outstd_logic_vector(6downto0);--七段码管显示输出

SEG_SEL:bufferstd_logic_vector(2downto0)--七段码管扫描驱动

);

endexp18;

architecturebehaveofexp18is

signalDisp_Temp:integerrange0to15;

signalDisp_Decode:std_logic_vector(6downto0);

signalSEC1,SEC10:integerrange0to9;

signalDirection:integerrange0to15;

signalClk_Count1:std_logic_vector(9downto0);--产生0.5Hz时钟的分频计数器

signalClk1Hz:std_logic;

signalDir_Flag:std_logic;--方向标志

begin

process(Clk)

begin

if(ClkeventandClk=1)then

if(Clk_Count11000)then

Clk_Count1=Clk_Count1+1;

else

endif;

endif;

endprocess;

Clk1Hz=Clk_Count1(9);

process(Clk1Hz,Rst)

begin

if(Rst=0)then

SEC1=0;

SEC10=2;

Dir_Flag=0;

elsif(Clk1HzeventandClk1Hz=1)then

if(SEC1=0)then

SEC1=9;

if(SEC10=0)then

SEC10=1;

else

SEC10=SEC10-1;

endif;

else

SEC1=SEC1-1;

endif;

if(SEC1=0andSEC10=0)then

Dir_Flag=n