哪位帮我看看这个程序

只看该作者 · 2007-1-9 18:02

我想把一个三位数的个位.十位.百位的数分开来输出.
library ieee,book_lib;
use ieee.std_logic_1164.all,book_lib.utils_pkg.all;

entity display is
port(datain:in integer range 0 to 1000;
      x1,x2,x3:out integer range 0 to 10);
end display;

architecture beha of display is
  variable a,b:natural;
process(datain)
begin
    a:=integer(datain/100);
    x1<=a;
    b:=integer((datain-a*100)/10);
    x2<=b;
  x3<=datain-a*100-b*10;
  end process;
end;