+ subtype hstring is string(1 to HSPALTE_MAX+1);
+ subtype hstr_int is integer range 0 to HSPALTE_MAX+1;
+
+ procedure icwait(signal clk_i : IN std_logic; cycles: natural);
+
+ function ascii2sc (x : hbyte) return hbyte;
+ function valid_char (x : hbyte) return boolean;
+ function zeile2char(i : std_logic_vector; stelle : natural) return hbyte;
+
+ -- http://www.marjorie.de/ps2/scancode-set2.htm
+ constant SC_KP_0 : hbyte := x"70";
+ constant SC_KP_1 : hbyte := x"69";
+ constant SC_KP_2 : hbyte := x"72";
+ constant SC_KP_3 : hbyte := x"7a";
+ constant SC_KP_4 : hbyte := x"6b";
+ constant SC_KP_5 : hbyte := x"73";
+ constant SC_KP_6 : hbyte := x"74";
+ constant SC_KP_7 : hbyte := x"6c";
+ constant SC_KP_8 : hbyte := x"75";
+ constant SC_KP_9 : hbyte := x"7d";
+
+ constant SC_0 : hbyte := x"45";
+ constant SC_1 : hbyte := x"16";
+ constant SC_2 : hbyte := x"1e";
+ constant SC_3 : hbyte := x"26";
+ constant SC_4 : hbyte := x"25";
+ constant SC_5 : hbyte := x"2e";
+ constant SC_6 : hbyte := x"36";
+ constant SC_7 : hbyte := x"3d";
+ constant SC_8 : hbyte := x"3e";
+ constant SC_9 : hbyte := x"46";
+
+ constant SC_KP_PLUS : hbyte := x"79";
+ constant SC_KP_MINUS : hbyte := x"7b";
+ constant SC_KP_MUL : hbyte := x"7c";
+ constant SC_KP_DIV : hbyte := x"4a"; -- inkl. 0xe0!
+
+ -- fuer deutsches layout, alle anderen zeichen sind unguenstig belegt
+ constant SC_PLUS : hbyte := x"5b";
+
+ constant SC_ENTER : hbyte := x"5a";
+ constant SC_BKSP : hbyte := x"66";
+ constant SC_SPACE : hbyte := x"29";
+
+ -- components...
+ component alu is
+ port (
+ sys_clk : in std_logic;
+ sys_res_n : in std_logic;
+ opcode : in alu_ops;
+ op1 : in csigned;
+ op2 : in csigned;
+ op3 : out csigned;
+ opM : out csigned;
+ do_calc : in std_logic;
+ calc_done : out std_logic;
+ calc_error : out std_logic
+ );
+ end component alu;
+
+ component parser is
+ port (
+ sys_clk : in std_logic;
+ sys_res_n : in std_logic;
+ -- History
+ p_rget : out std_logic;
+ p_rdone : in std_logic;
+ p_read : in hbyte;
+ p_wtake : out std_logic;
+ p_wdone : in std_logic;
+ p_write : out hbyte;
+ p_finished : out std_logic;
+ -- Scanner
+ do_it : in std_logic;
+ finished : out std_logic
+ );
+ end component parser;
+
+ component scanner is
+ port (
+ sys_clk : in std_logic;
+ sys_res_n : in std_logic;
+ -- PS/2
+ new_data : in std_logic;
+ data : in std_logic_vector(7 downto 0);
+ -- History
+ s_char : out hbyte;
+ s_take : out std_logic;
+ s_done : in std_logic;
+ s_backspace : out std_logic;
+ -- Parser
+ do_it : out std_logic;
+ finished : in std_logic
+ );
+ end component scanner;
+
+ component history is
+ port (
+ sys_clk : in std_logic;
+ sys_res_n : in std_logic;
+ -- PC-komm
+ pc_get : in std_logic;
+ pc_spalte : in hspalte;
+ pc_zeile : in hzeile;
+ pc_char : out hbyte;
+ pc_done : out std_logic;
+ -- Scanner
+ s_char : in hbyte;
+ s_take : in std_logic;
+ s_done : out std_logic;
+ s_backspace : in std_logic;
+ -- Display
+ d_new_eingabe : out std_logic;
+ d_new_result : out std_logic;
+ d_new_bs : out std_logic;
+ d_zeile : in hzeile;
+ d_spalte : in hspalte;
+ d_get : in std_logic;
+ d_done : out std_logic;
+ d_char : out hbyte;
+ -- Parser
+ p_rget : in std_logic;
+ p_rdone : out std_logic;
+ p_read : out hbyte;
+ p_wtake : in std_logic;
+ p_wdone : out std_logic;
+ p_write : in hbyte;
+ p_finished : in std_logic
+ );
+ end component history;
+
+ component display is
+ port (
+ sys_clk : in std_logic;
+ sys_res_n : in std_logic;
+ -- History
+ d_new_eingabe : in std_logic;
+ d_new_result : in std_logic;
+ d_new_bs : in std_logic;
+ d_zeile : out hzeile;
+ d_spalte : out hspalte;
+ d_get : out std_logic;
+ d_done : in std_logic;
+ d_char : in hbyte;
+ -- VGA
+ command : out std_logic_vector(7 downto 0);
+ command_data : out std_logic_vector(31 downto 0);
+ free : in std_logic
+ );
+ end component display;