priority_encoder83.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;
use ieee.std_logic_unsigned.all;

entity priority_encoder83 is
	port ( a: in std_logic_vector(7 downto 0);
		   b: out std_logic_vector(2 downto 0));

end priority_encoder83;
architecture a of priority_encoder83 is
begin
priority:process(a)
begin
	b<="000";
	for i in 7 downto 0 loop
		if (a(i)='1') then
		b<=to_stdlogicvector(i,3);
		end if;
		exit;
	end loop;
end process;
end a;