2 use ieee.std_logic_1164.all;
3 use ieee.numeric_std.all;
7 subtype alu_ops is std_logic_vector(2 downto 0);
8 constant ALU_NOP : alu_ops := "000";
9 constant ALU_SUB : alu_ops := "001";
10 constant ALU_ADD : alu_ops := "010";
11 constant ALU_MUL : alu_ops := "011";
12 constant ALU_DIV : alu_ops := "100";
13 constant ALU_DONE : alu_ops := "101";
15 constant CBITS : integer := 32;
16 subtype csigned is signed((CBITS-1) downto 0);
17 subtype divinteger is unsigned(4 downto 0);
18 -- integer ist 32bit (31bit + sign)
19 subtype cinteger is integer;
21 -- 50 zeilen * 71 zeichen * 2 (berechnung + ergebnis) = 7100 bytes
22 constant H_RAM_SIZE : integer := 7100;
23 constant H_RAM_WIDTH : integer := log2c(H_RAM_SIZE);
24 subtype hspalte is std_logic_vector(6 downto 0);
25 subtype hzeile is std_logic_vector(6 downto 0);
26 subtype hbyte is std_logic_vector(7 downto 0);
27 subtype hstring is string(1 to 72);
28 subtype hstr_int is integer range 0 to 72;
30 function find_msb(a : std_logic_vector) return std_logic_vector;
31 procedure icwait(signal clk_i : IN std_logic; cycles: natural);
33 -- http://www.marjorie.de/ps2/scancode-set2.htm
34 constant SC_KP_0 : std_logic_vector(7 downto 0) := x"70";
35 constant SC_KP_1 : std_logic_vector(7 downto 0) := x"69";
36 constant SC_KP_2 : std_logic_vector(7 downto 0) := x"72";
37 constant SC_KP_3 : std_logic_vector(7 downto 0) := x"7a";
38 constant SC_KP_4 : std_logic_vector(7 downto 0) := x"6b";
39 constant SC_KP_5 : std_logic_vector(7 downto 0) := x"73";
40 constant SC_KP_6 : std_logic_vector(7 downto 0) := x"74";
41 constant SC_KP_7 : std_logic_vector(7 downto 0) := x"6c";
42 constant SC_KP_8 : std_logic_vector(7 downto 0) := x"75";
43 constant SC_KP_9 : std_logic_vector(7 downto 0) := x"7d";
45 constant SC_KP_PLUS : std_logic_vector(7 downto 0) := x"79";
46 constant SC_KP_MINUS : std_logic_vector(7 downto 0) := x"7b";
47 constant SC_KP_MUL : std_logic_vector(7 downto 0) := x"7c";
48 constant SC_KP_DIV : std_logic_vector(7 downto 0) := x"4a"; -- inkl. 0xe0!
50 constant SC_ENTER : std_logic_vector(7 downto 0) := x"5a";
51 constant SC_BKSP : std_logic_vector(7 downto 0) := x"66";
52 constant SC_SPACE : std_logic_vector(7 downto 0) := x"29";
55 package body gen_pkg is
56 -- http://www.velocityreviews.com/forums/showpost.php?p=137148&postcount=5
57 function find_msb(a : std_logic_vector) return std_logic_vector is
58 function bits_to_fit(n : positive) return natural is
59 variable nn, bits : natural := 0;
69 function or_all(p : std_logic_vector) return std_logic is
70 variable r : std_logic;
79 constant wN : positive := bits_to_fit(a'length - 1);
80 constant wP : positive := 2 ** wN;
81 variable pv : std_logic_vector(wP-1 downto 0);
82 variable n : std_logic_vector(wN downto 1);
85 n(n'right) := a(a'left);
87 pv(a'length-1 downto 0) := a;
88 if or_all(pv(wP-1 downto wP/2)) = '1' then
89 n := '1' & find_msb((pv(wP-1 downto wP/2)));
91 n := '0' & find_msb((pv(wP/2-1 downto 0)));
95 end function find_msb;
96 -- -- alternativ: eleganter, braucht aber mehr logic cells
97 -- for i in (CBITS-1) downto 0 loop
98 -- exit when a(i) = '1';
101 -- return (CBITS - r);
103 procedure icwait(signal clk_i : IN std_logic; cycles: Natural) is
105 for i in 1 to cycles loop
106 wait until clk_i= '0' and clk_i'event;
109 end package body gen_pkg;