aa.vhd

来自「智能化微机测量和控制技术的迅速发展和广泛应用己经渗透到国民经济的各个部门。不但国」· VHDL 代码 · 共 36 行

-- aa.vhd
---此模块产生对数码管的位选信号

library ieee; 
use ieee.std_logic_1164.all; 
---------------------------------
entity aa is 
port(sel:in std_logic_vector(2 downto 0); 
d1,d2,d3,d4:out std_logic); 
end aa; 
---------------------------------------
architecture bbb_arc of aa is 
begin 
process(sel) 
begin 
d1<='0';d2<='0';d3<='0';d4<='0';  ----输入初始值
if sel="010" then
d1<='0';d2<='0';d3<='0';d4<='1';

elsif sel="011" then
d1<='0';d2<='0';d3<='1';d4<='0';

elsif sel="010" then
d1<='0';d2<='1';d3<='0';d4<='0';

elsif sel="010" then
d1<='1';d2<='0';d3<='0';d4<='0';

else d1<='0';d2<='0';d3<='0';d4<='0';

end if;

end process; 
end bbb_arc;