priority_encoder8.vhd

计数器、频率计、优先编码器、数码管扫描电路、数据选择器

library ieee;
use ieee.std_logic_1164.all;

entity priority_encoder8 is
	port ( a: in std_logic_vector(7 downto 0);
		   b: out std_logic_vector(2 downto 0));

end priority_encoder8;
architecture a of priority_encoder8 is
begin
priority:process(a)
begin
	if a(7)='1' then b<="111";
		elsif a(6)='1' then b<="110";
		elsif a(5)='1' then b<="101";
		elsif a(4)='1' then b<="100";
		elsif a(3)='1' then b<="011";
		elsif a(2)='1' then b<="010";
		elsif a(1)='1' then b<="001";
		elsif a(0)='1' then b<="000";
	end if;
end process;
end a;