LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY decoder3to82 IS
PORT( A : IN STD_LOGIC_VECTOR(2 DOWNTO 0);
output : OUT BIT_VECTOR(7 DOWNTO 0));
END decoder3to82;
ARCHITECTURE behave1 OF decoder3to82 IS
BEGIN
output<="00000001" SLL CONV_INTEGER(A) ;
END behave1;
提示错误: