library ieee;
use ieee.std_logic_1164.all;

package ESD2004_types is

subtype alu_op is std_logic_vector(3 downto 0);

constant alu_add : alu_op := "0000";
constant alu_sub : alu_op := "0001";
constant alu_and : alu_op := "0010";
constant alu_or  : alu_op := "0011";
constant alu_not : alu_op := "0100";
constant alu_xor : alu_op := "0101";
constant alu_sgt : alu_op := "1000";
constant alu_sge : alu_op := "1001";
constant alu_slt : alu_op := "1010";
constant alu_sle : alu_op := "1011";

subtype jump_op is std_logic_vector(2 downto 0);

constant j_normal : jump_op := "000";
constant j_reg    : jump_op := "001";
constant j_imm    : jump_op := "100";
constant j_beqz   : jump_op := "101";
constant j_bneqz  : jump_op := "110";

subtype shift_op is std_logic_vector(1 downto 0);

constant sh_sll : shift_op := "00";
constant sh_srl : shift_op := "01";
constant sh_sra : shift_op := "10";

end ESD2004_types;


package body ESD2004_types is
end ESD2004_types;