library ieee;  use ieee.std_logic_1164.all;

package alu_types is

  subtype alu_func is std_logic_vector(3 downto 0);

  constant alu_add :     alu_func := "0000";
  constant alu_addu :    alu_func := "0001";
  constant alu_sub :     alu_func := "0010";
  constant alu_subu :    alu_func := "0011";
  constant alu_and :     alu_func := "0100";
  constant alu_or :      alu_func := "0101";
  constant alu_xor :     alu_func := "0110";
  constant alu_sll :     alu_func := "1000";
  constant alu_srl :     alu_func := "1001";
  constant alu_sra :     alu_func := "1010";
  constant alu_pass_s1 : alu_func := "1100";
  constant alu_pass_s2 : alu_func := "1101";

end package alu_types;