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 procedure icwait(signal clk_i : IN std_logic; cycles: natural);
32 function ascii2sc (x : hbyte) return hbyte;
33 function valid_char (x : hbyte) return boolean;
35 -- http://www.marjorie.de/ps2/scancode-set2.htm
36 constant SC_KP_0 : hbyte := x"70";
37 constant SC_KP_1 : hbyte := x"69";
38 constant SC_KP_2 : hbyte := x"72";
39 constant SC_KP_3 : hbyte := x"7a";
40 constant SC_KP_4 : hbyte := x"6b";
41 constant SC_KP_5 : hbyte := x"73";
42 constant SC_KP_6 : hbyte := x"74";
43 constant SC_KP_7 : hbyte := x"6c";
44 constant SC_KP_8 : hbyte := x"75";
45 constant SC_KP_9 : hbyte := x"7d";
47 constant SC_0 : hbyte := x"45";
48 constant SC_1 : hbyte := x"16";
49 constant SC_2 : hbyte := x"1e";
50 constant SC_3 : hbyte := x"26";
51 constant SC_4 : hbyte := x"25";
52 constant SC_5 : hbyte := x"2e";
53 constant SC_6 : hbyte := x"36";
54 constant SC_7 : hbyte := x"3d";
55 constant SC_8 : hbyte := x"3e";
56 constant SC_9 : hbyte := x"46";
58 constant SC_KP_PLUS : hbyte := x"79";
59 constant SC_KP_MINUS : hbyte := x"7b";
60 constant SC_KP_MUL : hbyte := x"7c";
61 constant SC_KP_DIV : hbyte := x"4a"; -- inkl. 0xe0!
63 -- fuer deutsches layout, alle anderen zeichen sind unguenstig belegt
64 constant SC_PLUS : hbyte := x"5b";
66 constant SC_ENTER : hbyte := x"5a";
67 constant SC_BKSP : hbyte := x"66";
68 constant SC_SPACE : hbyte := x"29";
71 package body gen_pkg is
72 procedure icwait(signal clk_i : IN std_logic; cycles: Natural) is
74 for i in 1 to cycles loop
75 wait until clk_i= '0' and clk_i'event;
79 function ascii2sc (x : hbyte) return hbyte is
83 when x"30" => y := SC_KP_0;
84 when x"31" => y := SC_KP_1;
85 when x"32" => y := SC_KP_2;
86 when x"33" => y := SC_KP_3;
87 when x"34" => y := SC_KP_4;
88 when x"35" => y := SC_KP_5;
89 when x"36" => y := SC_KP_6;
90 when x"37" => y := SC_KP_7;
91 when x"38" => y := SC_KP_8;
92 when x"39" => y := SC_KP_9;
93 when x"2b" => y := SC_KP_PLUS;
94 when x"2d" => y := SC_KP_MINUS;
95 when x"2a" => y := SC_KP_MUL;
96 when x"2f" => y := SC_KP_DIV;
97 when x"20" => y := SC_SPACE;
98 when x"1c" => y := SC_ENTER;
99 when x"0e" => y := SC_BKSP;
100 when others => y := x"41";
105 function valid_char (x : hbyte) return boolean is
106 variable y : boolean;
109 when SC_KP_0 | SC_KP_1 | SC_KP_2 | SC_KP_3 |
110 SC_KP_4 | SC_KP_5 | SC_KP_6 | SC_KP_7 |
111 SC_KP_8 | SC_KP_9 | SC_KP_PLUS |
112 SC_KP_MINUS | SC_KP_MUL |
113 SC_KP_DIV | SC_SPACE |
114 SC_BKSP | SC_ENTER =>
116 when others => y := false;
120 end package body gen_pkg;