2 use ieee.std_logic_1164.all;
3 use ieee.numeric_std.all;
8 sys_clk : in std_logic;
9 sys_res_n : in std_logic;
11 pc_get : in std_logic;
12 pc_spalte : in hspalte;
15 pc_done : out std_logic;
16 pc_busy : out std_logic;
19 s_take : in std_logic;
20 s_done : out std_logic;
21 s_backspace : in std_logic;
23 d_new_eingabe : out std_logic;
24 d_new_result : out std_logic;
25 d_new_bs : out std_logic;
27 d_spalte : in hspalte;
29 d_done : out std_logic;
32 p_rget : in std_logic;
33 p_rdone : out std_logic;
35 p_wtake : in std_logic;
36 p_wdone : out std_logic;
38 p_finished : in std_logic
42 architecture beh of history is
43 type HISTORY_STATE is (SIDLE, S_S_INIT, S_S_WRITE, S_S_BS, S_S_DONE, S_S_FIN,
44 S_D_INIT, S_D_READ, S_S_FIN_POSUP, S_P_READ, S_P_READ_DONE, S_P_WRITE,
45 S_P_WRITE_DONE, S_P_DONE, S_INIT, S_S_CLEAR_NEXT0, S_S_CLEAR_NEXT1, S_PC_INIT, S_PC_READ);
46 signal state_int, state_next : HISTORY_STATE;
47 signal was_bs_int, was_bs_next : std_logic;
48 signal pos_int, pos_next : std_logic_vector(H_RAM_WIDTH - 1 downto 0);
49 signal s_done_int, s_done_next : std_logic;
50 signal s_cnt_int, s_cnt_next : hspalte;
51 signal d_new_eingabe_int, d_new_eingabe_next : std_logic;
52 signal d_new_result_int, d_new_result_next : std_logic;
53 signal d_new_bs_int, d_new_bs_next: std_logic;
54 signal d_done_int, d_done_next : std_logic;
55 signal d_char_int, d_char_next : hbyte;
56 signal p_rdone_int, p_rdone_next : std_logic;
57 signal p_wdone_int, p_wdone_next : std_logic;
58 signal p_read_int, p_read_next : hbyte;
59 signal p_sp_read_int, p_sp_read_next : hspalte;
60 signal p_sp_write_int, p_sp_write_next : hspalte;
61 signal pc_char_next ,pc_char_int : hbyte;
62 signal pc_done_next, pc_done_int : std_logic;
63 signal pc_busy_next, pc_busy_int : std_logic;
66 signal address_next, address_int : std_logic_vector(H_RAM_WIDTH - 1 downto 0);
67 signal data_out, data_in_next, data_in_int : hbyte;
68 signal wr_next, wr_int : std_logic;
71 d_new_eingabe <= d_new_eingabe_int;
72 d_new_result <= d_new_result_int;
73 d_new_bs <= d_new_bs_int;
76 p_rdone <= p_rdone_int;
77 p_wdone <= p_wdone_int;
79 pc_done <= pc_done_int;
80 pc_busy <= pc_busy_int;
81 pc_char <= pc_char_int;
83 process(sys_clk, sys_res_n)
85 if sys_res_n = '0' then
89 pos_int <= (others => '0');
92 s_cnt_int <= (0 => '1', others => '0');
93 d_new_result_int <= '0';
94 d_new_eingabe_int <= '0';
97 d_char_int <= (others => '0');
100 p_read_int <= (others => '0');
101 p_sp_read_int <= (others => '0');
102 p_sp_write_int <= std_logic_vector(to_unsigned(71,p_sp_write_int'length));
104 pc_char_int <= (others => '0');
107 address_int <= (0 => '1', others => '0');
108 data_in_int <= x"00";
110 elsif rising_edge(sys_clk) then
112 state_int <= state_next;
113 was_bs_int <= was_bs_next;
116 s_done_int <= s_done_next;
117 s_cnt_int <= s_cnt_next;
118 d_new_result_int <= d_new_result_next;
119 d_new_eingabe_int <= d_new_eingabe_next;
120 d_new_bs_int <= d_new_bs_next;
121 d_done_int <= d_done_next;
122 d_char_int <= d_char_next;
123 p_rdone_int <= p_rdone_next;
124 p_wdone_int <= p_wdone_next;
125 p_read_int <= p_read_next;
126 p_sp_read_int <= p_sp_read_next;
127 p_sp_write_int <= p_sp_write_next;
129 pc_char_int <= pc_char_next;
130 pc_done_int <= pc_done_next;
132 address_int <= address_next;
133 data_in_int <= data_in_next;
139 process(state_int, d_get, pc_get, p_finished, s_take, s_backspace, was_bs_int,
140 p_rget, p_wtake, pos_int, s_cnt_int)
142 state_next <= state_int;
146 -- ganzen speicher clearen: fuer ausgabe am vga nicht umbedingt
147 -- noetig, aber spaetestens fuers dumpen per rs232
148 if pos_int = std_logic_vector(to_unsigned(H_RAM_SIZE,H_RAM_WIDTH)) then
154 state_next <= S_S_INIT;
155 elsif p_rget = '1' then
156 state_next <= S_P_READ;
157 elsif p_wtake = '1' then
158 state_next <= S_P_WRITE;
159 elsif p_finished = '1' then
160 state_next <= S_S_FIN;
161 elsif d_get = '1' then
162 state_next <= S_D_INIT;
163 elsif pc_get = '1' then
164 state_next <= S_PC_INIT;
167 if s_backspace = '1' then
168 state_next <= S_S_BS;
170 state_next <= S_S_WRITE;
173 state_next <= S_S_DONE;
175 state_next <= S_S_DONE;
177 if p_finished = '0' then
178 state_next <= S_S_FIN_POSUP;
180 when S_S_FIN_POSUP =>
181 state_next <= S_S_CLEAR_NEXT0;
182 when S_S_CLEAR_NEXT0 =>
183 if s_cnt_int = hspalte(to_unsigned(71,hspalte'length)) then
184 state_next <= S_S_CLEAR_NEXT1;
186 when S_S_CLEAR_NEXT1 =>
187 if s_cnt_int = hspalte(to_unsigned(71,hspalte'length)) then
196 state_next <= S_D_READ;
202 state_next <= S_PC_READ;
208 state_next <= S_P_READ_DONE;
209 when S_P_READ_DONE =>
211 state_next <= S_P_DONE;
214 state_next <= S_P_WRITE_DONE;
215 when S_P_WRITE_DONE =>
216 if p_wtake = '0' then
217 state_next <= S_P_DONE;
225 process(state_int, s_cnt_int, d_spalte, d_zeile, data_out, s_char, address_int,
226 data_in_int, d_new_result_int, d_new_eingabe_int, d_new_bs_int,
227 was_bs_int, s_take, pos_int, p_rdone_int, p_wdone_int, p_read_int,
228 p_write, p_sp_read_int, p_sp_write_int, pc_char_int, pc_zeile, pc_spalte)
229 variable addr_tmp : std_logic_vector(H_RAM_WIDTH - 1 downto 0);
230 variable spalte_tmp : hspalte;
231 variable mul_tmp : std_logic_vector((H_RAM_WIDTH*2) -1 downto 0);
234 s_cnt_next <= s_cnt_int;
235 was_bs_next <= was_bs_int;
237 d_new_result_next <= d_new_result_int;
238 d_new_eingabe_next <= d_new_eingabe_int;
239 d_new_bs_next <= '0';
241 d_char_next <= (others => '0');
243 address_next <= address_int;
244 data_in_next <= data_in_int;
246 pc_char_next <= pc_char_int; --(others => '0');
247 p_rdone_next <= p_rdone_int;
248 p_wdone_next <= p_wdone_int;
249 p_read_next <= p_read_int;
250 p_sp_read_next <= p_sp_read_int;
251 p_sp_write_next <= p_sp_write_int;
256 address_next <= pos_int;
257 data_in_next <= (others => '0');
258 if pos_int = std_logic_vector(to_unsigned(H_RAM_SIZE,H_RAM_WIDTH)) then
259 pos_next <= (others => '0');
261 pos_next <= std_logic_vector(unsigned(pos_int) + to_unsigned(1,H_RAM_WIDTH));
264 d_new_result_next <= '0';
268 -- nur bei < 71 weiter machen
269 -- Hint: '/=' billiger als '<'
270 if unsigned(s_cnt_int) /= 71 then
272 address_next <= std_logic_vector(unsigned(pos_int) + unsigned(s_cnt_int));
273 data_in_next <= s_char;
274 s_cnt_next <= std_logic_vector(unsigned(s_cnt_int) + 1);
276 -- was_bs hier missbrauchen, um ein d_new_eingabe zu verhindern
280 -- ab 1 darf nicht mehr dekrementiert werden
281 addr_tmp := (others => '0');
282 if unsigned(s_cnt_int) /= 1 then
283 addr_tmp(hspalte'length - 1 downto 0) := std_logic_vector(unsigned(s_cnt_int) - 1);
284 d_new_bs_next <= '1';
286 addr_tmp(hspalte'length - 1 downto 0) := s_cnt_int;
288 s_cnt_next <= addr_tmp(hspalte'length - 1 downto 0);
291 address_next <= std_logic_vector(unsigned(pos_int) + unsigned(addr_tmp));
292 data_in_next <= (others => '0');
295 s_cnt_next <= (0 => '1', others => '0');
296 d_new_result_next <= '1';
297 -- resetten der parser counter
298 p_sp_read_next <= (others => '0');
299 p_sp_write_next <= std_logic_vector(to_unsigned(71,p_sp_write_next'length));
300 when S_S_FIN_POSUP =>
301 -- overflowcheck nach 50 berechnungen => wieder von vorne anfangen
302 if pos_int = std_logic_vector(to_unsigned(H_RAM_SIZE-142,H_RAM_WIDTH)) then
303 pos_next <= (others => '0');
305 pos_next <= std_logic_vector(unsigned(pos_int) + to_unsigned(142,H_RAM_WIDTH));
307 when S_S_CLEAR_NEXT0 =>
308 -- die naechsten 142 bytes im speicher resetten
310 address_next <= std_logic_vector(unsigned(pos_int) + unsigned(s_cnt_int));
311 data_in_next <= (others => '0');
312 if s_cnt_int = hspalte(to_unsigned(71,hspalte'length)) then
313 s_cnt_next <= (0 => '1', others => '0');
315 s_cnt_next <= std_logic_vector(unsigned(s_cnt_int) + 1);
317 when S_S_CLEAR_NEXT1 =>
318 -- die naechsten 142 bytes im speicher resetten
320 address_next <= std_logic_vector(unsigned(pos_int) + to_unsigned(71,H_RAM_WIDTH) + unsigned(s_cnt_int));
321 data_in_next <= (others => '0');
322 if s_cnt_int = hspalte(to_unsigned(71,hspalte'length)) then
323 s_cnt_next <= (0 => '1', others => '0');
325 s_cnt_next <= std_logic_vector(unsigned(s_cnt_int) + 1);
329 if was_bs_int = '0' then
330 d_new_eingabe_next <= '1';
337 addr_tmp := (others => '0');
338 addr_tmp(hzeile'length - 1 downto 0) := d_zeile;
339 mul_tmp := std_logic_vector(unsigned(addr_tmp) * to_unsigned(71,H_RAM_WIDTH));
340 addr_tmp := mul_tmp((addr_tmp'length - 1) downto 0);
341 addr_tmp := std_logic_vector(unsigned(addr_tmp) + unsigned(d_spalte));
342 address_next <= addr_tmp;
343 d_new_eingabe_next <= '0';
344 d_new_result_next <= '0';
346 d_char_next <= data_out;
350 addr_tmp := (others => '0');
351 addr_tmp(hzeile'length - 1 downto 0) := pc_zeile;
352 mul_tmp := std_logic_vector(unsigned(addr_tmp) * to_unsigned(71,H_RAM_WIDTH));
353 addr_tmp := mul_tmp((addr_tmp'length - 1) downto 0);
354 addr_tmp := std_logic_vector(unsigned(addr_tmp) + unsigned(pc_spalte));
355 address_next <= addr_tmp;
357 pc_char_next <= data_out;
361 spalte_tmp := std_logic_vector(unsigned(p_sp_read_int) + 1);
362 p_sp_read_next <= spalte_tmp;
363 address_next <= std_logic_vector(unsigned(pos_int) + unsigned(spalte_tmp));
364 when S_P_READ_DONE =>
366 p_read_next <= data_out;
370 data_in_next <= p_write;
371 spalte_tmp := std_logic_vector(unsigned(p_sp_write_int) - 1);
372 p_sp_write_next <= spalte_tmp;
373 address_next <= std_logic_vector(unsigned(pos_int) + to_unsigned(71,H_RAM_WIDTH) + unsigned(spalte_tmp));
374 when S_P_WRITE_DONE =>
382 sp_ram_inst : entity work.sp_ram(beh)
384 ADDR_WIDTH => H_RAM_WIDTH
388 address => address_int,
389 data_out => data_out,
391 data_in => data_in_int
393 end architecture beh;