kong.vhd

VHDL语言编写一个汽车尾灯显示的程序

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY kong IS
port(left,right:in std_logic;
lft,rit,lr:out std_logic);
end kong;
ARCHITECTURE kong_arc OF kong IS
begin
process(left,right)
variable a:std_logic_vector(1 downto 0);
begin
a:=left&right;
case a is
when "00"=>lft<='0';
rit<='0';
lr<='0';
when "10"=>lft<='1';
rit<='0';
lr<='0';
when "01"=>lft<='1';
rit<='0';
lr<='0';
when others=>rit<='1';
lft<='1';
lr<='1';
end case;
end process;
end kong_arc;