mips_sys

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
-- 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;
USE work.io_switches_pins.all;
ENTITY e_io_switches IS
    PORT (
        rst:            IN  std_logic;
        clk:            IN  std_logic;
        i_addr:         IN  std_logic_vector( 0 DOWNTO 0);
        o_rd_data:      OUT std_logic_vector(31 DOWNTO 0);
        pin_i_switches: IN  t_io_switches_pins
    );
END ENTITY e_io_switches;
ARCHITECTURE a_io_switches OF e_io_switches IS
    CONSTANT c_scale:  natural := 50000;
    CONSTANT c_states: natural := 5;
    SUBTYPE t_state  IS std_logic_vector(31 DOWNTO 0);
    TYPE    t_states IS ARRAY(0 TO c_states - 1) OF t_state;
    CONSTANT c_state_def:  t_state  := io_switches_to_slv(
                                         c_io_switches_pins_default);
    CONSTANT c_states_def: t_states := (OTHERS => c_state_def);
    SIGNAL n_scale: natural RANGE 0 TO c_scale - 1;
    SIGNAL r_scale: natural RANGE 0 TO c_scale - 1 := 0;
    SIGNAL n_states: t_states;
    SIGNAL r_states: t_states := c_states_def;
    SIGNAL n_debounced: t_state;
    SIGNAL r_debounced: t_state := c_state_def;
    SIGNAL n_rot_val:  std_logic_vector( 1 DOWNTO 0);
    SIGNAL r_rot_val:  std_logic_vector( 1 DOWNTO 0) := (OTHERS => '0');
    SIGNAL r_rot_prev: std_logic_vector( 1 DOWNTO 0) := (OTHERS => '0');
    SIGNAL n_rot_cnt:  std_logic_vector(31 DOWNTO 0);
    SIGNAL r_rot_cnt:  std_logic_vector(31 DOWNTO 0) := (OTHERS => '0');
BEGIN
    p_scale: PROCESS(r_scale)
    BEGIN
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX