title: VHDL: ceiling and floor of division by two integer constants
body: <p>In VHDL, I'm Looking for a way to take two integer parameters of an entity, divide one against the the other as a floating point number, and then find both the floor and ceiling of this floating point ratio, and then store it as a vhdl integer constant.</p>
  
  <pre><code>library ieee;
  use     ieee.std_logic_1164.all;
  
  entity something is
      generic(
          N: natural := 4;
          M: natural := 150
      );
      port(
          sys_clk     :in  std_logic;
          sys_rst     :in  std_logic;
  
          datai       :in  std_logic_vector(M-1 downto 0);
          datao       :out std_logic_vector(N-1 downto 0)
      );
  end entity;
  
  
  architecture rtl is something is
      --how to calculate ceiling of  M / N?
      constant ratio_ceiling :integer := integer(real(M)/real(N));
  
      --how to calculate floor of M / N?
      constant ratio_floor   :integer := integer(real(M)/real(N));
  
  begin
  
  end architecture;
  </code></pre>