求高手帮我看看交通灯设计，我找不出哪里错了~~
library ieee;use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
ENTITY traffic is
PORT(
clk:in std_logic;
row:out std_logic_vector(1 downto 0);-----xuanzexinhao
led:out std_logic_vector(6 downto 0);-----duankongzhixinhao
R1,Y1,G1,R2,Y2,G2: out std_logic);
END traffic;
architecture Behavioral of traffic is
TYPE states is (st0,st1,st2,st3);
signal sec0:std_logic_vector(3 downto 0); ----gewei
signal sec1:std_logic_vector(3 downto 0); ----shiwei
signal cnt:std_logic_vector(1 downto 0);
signal data:std_logic_vector(3 downto 0);
signal clk1,clk2:std_logic;-----1KHZHE 1HZ
BEGIN
P1:PROCESS(clk)
variable count1:integer range 0 to 12499; ------25000
begin
if rising_edge(clk) then
if count1=12499 then clk1<=not clk1;
count1:=0;
else count1:=count1+1;
END if;
end if;
END PROCESS P1;
-------------------------------------------------------------
P2:process(clk1) ------------1hzfenpin
variable count2:integer range 0 to 999;
begin
if rising_edge(clk1) then
if count2=999 then clk2<=not clk2;
count2:=0;
else count2:=count2+1;
END if;
END IF;
end process P2;
------------------
P3:process(clk2)
variable stx:states;
variable a:std_logic;
variable qh,ql:std_logic_vector(3 downto 0);
begin
if rising_edge(clk2) then
case stx is
when st0=>
if a='0'then
qh:="0001";
ql:="1001";
a:='1';
R1<='0';
Y1<='0';
G1<='1';
R2<='1';
Y2<='0';
G2<='0';
ELSE
if qh=0 and ql=1 then
stx:=st1;
a:='0';
qh:="0000";
ql:="0000";
else if ql=0 then
ql:="1001";
qh:=qh-1;
else
ql:=ql-1;
end if;
end if;
end if;
when st1=>
if a='0'then
qh:="0000";
ql:="0011";
a:='1';
R1<='0';
Y1<='1';
G1<='0';
R2<='1';
Y2<='0';
G2<='0';
else
if ql=1 then
stx:=st2;
a:='0';
qh:="0000";
ql:="0000";
else
ql:=ql-1;
end if;
end if;
end if;
when st2=>
if a='0'then
qh:="0000";
ql:="1001";
a:='1';
R1<='1';
Y1<='0';
G1<='0';
R2<='0';
Y2<='0';
G2<='1';
else
if qh=0 and ql=1 then
stx:=st3;
a:='0';
qh:="0000";
ql:="0000";
elsif ql=0 then
ql:="1001";
qh:=qh-1;
else
ql:=ql-1;
end if;
end if;
end if;
when st3=>
if a='0'then
qh:="0000";
ql:="0011";
a:='1';
R1<='1';
Y1<='0';
G1<='0';
R2<='0';
Y2<='1';
G2<='0';
else
if ql=1 then
stx:=st0;
a:='0';
qh:="0000";
ql:="0000";
else
ql:=ql-1;
end if;
end if;
end if;
end case;
end if;
sec0<=ql;sec1<=qh;
end process P3;
-------------------------------------------------------------
P4:PROCESS(clk1)
begin
if rising_edge(clk1) then
if cnt="01" then cnt<="00" ;
else cnt<=cnt+1;
end if;
end if;
END PROCESS P4;
---------------------
P5:PROCESS(cnt,sec0,sec1)
begin
case cnt is
when "00"=>data<=sec0;row<="01";
when "01"=>data<=sec1;row<="10";
when others=>null;
end case;
end process P5;
-----------------------------------------------------------
---dp.g.f.e.d.c.b.a
P6:process(data)
begin
case data is
when"0000"=>led<="11000000";
when"0001"=>led<="11111001";
when"0010"=>led<="10100100";
when"0011"=>led<="10110000";
when"0100"=>led<="10011001";
when"0101"=>led<="10010010";
when"0110"=>led<="10000010";
when"0111"=>led<="11111000";
when"1000"=>led<="10000000";
when"1001"=>led<="10010000";
when others=>led<=null;
end case;
end process P6;
END Behavioral;
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