简单的七段译码管译码程序，编译不通过！救救处学者

fybh911

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


ENTITY seg7 IS
PORT
     ( data:IN STD_LOGIC_VECTOR(3 DOWNTO 0);
       disp:OUT STD_LOGIC_VECTOR(0 TO 6)
      );
END seg7;

ARCHITECTURE one OF seg7 IS
TYPE disTable IS ARRAY(NATURAL RANGE<>)OF STD_LOGIC_VECTOR(0 TO 6);
   CONSTANT display_table: disTable :=
           ( "1111110","0110000","1101101","1111001","0110011","1011011",
             "1011111","1110000","1111111","1111011","1110111","0011111",
             "1001110","0111101","1001111","1000111");
BEGIN
  disp<=display_table(conv_integer(data));
END ;

报错:aggregates are supported only for types that map to an array of bit .                        ??只支持BIT型数组??
我是在MAX+PLUS 2 下编译的,是书上的例子.各位大虾来帮帮我这个初学者吧!!!

adefan

<P>USE IEEE.numeric_std.all</P><P>disp &lt;= display_table(to_integer(unsigned(data)));</P>