mips_sys

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-- MIPS I system
-- Copyright 2011-2012 Stefan Schuermans <stefan@blinkenarea.org>
-- Copyleft GNU public license V2 or later
--          http://www.gnu.org/copyleft/gpl.html
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.all;
PACKAGE mips_types IS
    -- operation
    TYPE t_op IS (
        op_none,
        op_alu,   -- ALU operation
        op_div,   -- divide
        op_divu,  -- divide unsigned
        op_j,     -- jump or branch
        op_l,     -- load
        op_mfhi,  -- move from HI
        op_mflo,  -- move from LO
        op_mthi,  -- move to HI
        op_mtlo,  -- move to LO
        op_mult,  -- multiply
        op_multu, -- multiply unsigned
        op_s      -- store
    );
    -- link (store return address in register)
    TYPE t_link IS (
        link_none,
        link_link  -- link
    );
    -- compare mode
    TYPE t_cmp IS (
        cmp_none,
        cmp_eq,   -- equal
        cmp_gez,  -- greater or equal zero
        cmp_gtz,  -- greater than zero
        cmp_lez,  -- less or equal zero
        cmp_ltz,  -- less than zero
        cmp_ne    -- not equal
    );
    -- ALU operation
    TYPE t_alu IS (
        alu_none,
        alu_add,  -- addition
        alu_and,  -- bitwise AND
        alu_nor,  -- bitwise NOR
 
 
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