library ieee;
use ieee.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
use ieee.math_real.all;

package tlmupack is

  function required_bits (
    value : natural)
    return positive;

end tlmupack;


package body tlmupack is


  -- purpose: returns required bits for a natural number
  -- 
  function required_bits (
    value : natural)
    return positive is
  begin  -- required_bits
    if value <= 1 then
      return 1;
    else
      return integer(ceil(log2(real(value) + 0.5)));
    end if;
  end required_bits;

end tlmupack;