問題描述，十字路，東西方向和南北方向燈，綠20s黃5s紅25s，倒計時顯示時間，另外，警車救護車等特殊狀態，都顯紅燈，且時間顯示不斷閃爍，通過之後，恢復原狀態。
以下是我編寫的源**：
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity traffic_light is
port(clk,special:in std_logic;
timel_show1:buffer std_logic_vector(3 downto 0);--東西計數器低四位
timeh_show1:buffer std_logic_vector(3 downto 0);--東西計數器高四位
timel_show2:buffer std_logic_vector(3 downto 0);--南北計數器低四位
timeh_show2:buffer std_logic_vector(3 downto 0);--南北計數器高四位
light1:buffer std_logic_vector(2 downto 0);--東西方向燈
light2:buffer std_logic_vector(2 downto 0);--南北方向燈
);end entity traffic_light;
architecture behv of traffic_light is
signal timel,timeh:std_logic_vector(3 downto 0);
begin
light1<="100";--東西綠
light2<="001";--南北黃
timel<="0000"；
timeh<="0101";
if special='0' then
if clk'event and clk='1' then
l1:loop
if timel<="0000" then
timeh<=timeh-1;
timel<="1001";
timel<=timel-1;
if timel<="0000" then
timeh<=timeh-1;
if timel="0000" and timeh="0000" then
timel<="0000";
timeh<="0010";
end if;
end if;
end if;
exit l1 when special='1';
end loop l1;
end if;
end if;
process(timel,timeh,clk,special)
begin
case timel and timeh is
when timel="0000" and timeh="0101" => light1<="100"
light2<="001";
if clk'event and clk='1' and special='1' then
timel_show1<="0000";
timeh_show1<="0010";--綠20s
timel_show1<="0101";
timeh_show1<="0010";--紅25s
if timel_show1="0000" then
timeh_show1<=timeh_show1-1;
timel_show1<="1001";
timel_show1<=timel_show1-1;
if timel_show1="0000" then
timeh_show1<=timeh_show1-1;
end if;
end if;
if timel_show2="0000" then
timeh_show2<=timeh_show2-1;
timel_show2<="1001";
timel_show2<=timel_show2-1;
if timel_show2="0000" then
timeh_show2<=timeh_show2-1;
end if;
end if;
if special='0' then
light1<="001";
light2<="001";
l2:loop
timel_show1<=timel_show1;
timeh_show1<=timeh_show1;
timel_show2<=timel_show2;
timeh_show2<=timeh_show2;
exit l2 when special='0';
end loop l2;
end if;
end if;
when timel="0000" and timeh="0011" => light1<="010"
light2<="001";
if clk'event and clk='1' and special='1' then
timel_show1<="0101";
timeh_show1<="0000";--黃5s
timel_show2<="0101";
timeh_show2<="0000";--紅5s
timel_show1<=timel_show1-1;
timel_show2<=timel_show2-1;
if special='0' then
light1<="001";
light2<="001";
l3:loop
timel_show1<=timel_show1;
timeh_show1<=timeh_show1;
timel_show2<=timel_show2;
timeh_show2<=timeh_show2;
exit l3 when special='0';
end loop l3;
end if;
end if;
when timel="0101" and timeh="0010" => light1<="001"
light2<="010";
if clk'event and clk='1' and special='1' then
timel_show1<="0101";
timeh_show1<="0010";--紅5s
timel_show2<="0101";
timeh_show2<="0000";--黃5s
timel_show1<=timel_show1-1;
timel_show2<=timel_show2-1;
if special='0' then
light1<="001";
light2<="001";
l4:loop
timel_show1<=timel_show1;
timeh_show1<=timeh_show1;
timel_show2<=timel_show2;
timeh_show2<=timeh_show2;
exit l4 when special='0';
end loop l4;
end if;
end if;
when timel="0000" and timeh="0010" => light1<="001"
light2<="100";
if clk'event and clk='1' and special='1' then
timel_show1<="0000";
timeh_show1<="0010";--紅20s
timel_show2<="0000";
timeh_show2<="0010";--綠20s
if timel_show1="0000" then
timeh_show1<=timeh_show1-1;
timel_show1<="1001";
timel_show1<=timel_show1-1;
if timel_show1="0000" then
timeh_show1<=timeh_show1-1;
end if;
end if;
if timel_show2="0000" then
timeh_show2<=timeh_show2-1;
timel_show2<="1001";
timel_show2<=timel_show2-1;
if timel_show2="0000" then
timeh_show2<=timeh_show2-1;
end if;
end if;
if special='0' then
light1<="001";
light2<="001";
l5:loop
timel_show1<=timel_show1;
timeh_show1<=timeh_show1;
timel_show2<=timel_show2;
timeh_show2<=timeh_show2;
exit l5 when special='0';
end loop l5;
end if;
end if;
end case;
end process;
end behv;
總結：除錯有錯誤，待修正，希望能和大家多交流。
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