12_convert.vhd

北京里工大学ASIC设计研究所的100个 VHDL程序设计例子

function I2B( Number :  integer ;  len :  integer ) return MVL7_VECTOR is
      variable temp: MVL7_VECTOR (len - 1 downto 0);
      variable NUM: integer:=0;
      variable QUOTIENT: integer:=0;
   begin
      QUOTIENT := Number;
      for I in 0 to len - 1 loop
         NUM := 0;
         while QUOTIENT > 1 loop
            QUOTIENT := QUOTIENT - 2;
            NUM := NUM + 1;
         end loop ;
         case QUOTIENT is
            when 1 =>
               temp(I) := '1';
            when 0 =>
               temp(I) := '0';
            when others =>
               null;
         end case;
         QUOTIENT := NUM;
      end loop ;
      return temp;
   end;