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1--+-------------------------------------------------------------------------------------------------+\r
2--| |\r
3--| File: pciwbsequ.vhd |\r
4--| |\r
5--| Project: pci32tlite_oc |\r
6--| |\r
7--| Description: FSM controlling PCI to Whisbone sequence. |\r
8--| |\r
9--+-------------------------------------------------------------------------------------------------+\r
10--| |\r
11--| Revision history : |\r
12--| Date Version Author Description |\r
13--| 2005-05-13 R00A00 PAU First alfa revision (eng) |\r
14--| 2006-01-09 MS added debug signals debug_init, debug_access | |\r
15--| |\r
16--| To do: |\r
17--| |\r
18--+-------------------------------------------------------------------------------------------------+\r
19--+-----------------------------------------------------------------+\r
20--| |\r
21--| Copyright (C) 2005 Peio Azkarate, peio@opencores.org | \r
22--| |\r
23--| This source file may be used and distributed without |\r
24--| restriction provided that this copyright statement is not |\r
25--| removed from the file and that any derivative work contains |\r
26--| the original copyright notice and the associated disclaimer. |\r
27--| |\r
28--| This source file is free software; you can redistribute it |\r
29--| and/or modify it under the terms of the GNU Lesser General |\r
30--| Public License as published by the Free Software Foundation; |\r
31--| either version 2.1 of the License, or (at your option) any |\r
32--| later version. |\r
33--| |\r
34--| This source is distributed in the hope that it will be |\r
35--| useful, but WITHOUT ANY WARRANTY; without even the implied |\r
36--| warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |\r
37--| PURPOSE. See the GNU Lesser General Public License for more |\r
38--| details. |\r
39--| |\r
40--| You should have received a copy of the GNU Lesser General |\r
41--| Public License along with this source; if not, download it |\r
42--| from http://www.opencores.org/lgpl.shtml |\r
43--| |\r
44--+-----------------------------------------------------------------+ \r
45\r
46\r
47--+-----------------------------------------------------------------------------+\r
48--| LIBRARIES |\r
49--+-----------------------------------------------------------------------------+\r
50\r
51library ieee;\r
52use ieee.std_logic_1164.all;\r
53\r
54\r
55--+-----------------------------------------------------------------------------+\r
56--| ENTITY |\r
57--+-----------------------------------------------------------------------------+\r
58\r
59entity pciwbsequ is\r
60port (\r
61\r
62 -- General \r
63 clk_i : in std_logic;\r
64 nrst_i : in std_logic;\r
65 -- pci \r
66 --adr_i\r
67 cmd_i : in std_logic_vector(3 downto 0);\r
68 cbe_i : in std_logic_vector(3 downto 0);\r
69 frame_i : in std_logic;\r
70 irdy_i : in std_logic;\r
71 devsel_o : out std_logic;\r
72 trdy_o : out std_logic;\r
73 -- control\r
74 adrcfg_i : in std_logic;\r
75 adrmem_i : in std_logic;\r
76 pciadrLD_o : out std_logic;\r
77 pcidOE_o : out std_logic;\r
78 parOE_o : out std_logic;\r
79 wbdatLD_o : out std_logic;\r
80 wbrgdMX_o : out std_logic;\r
81 wbd16MX_o : out std_logic; \r
82 wrcfg_o : out std_logic;\r
83 rdcfg_o : out std_logic;\r
84 -- whisbone\r
85 wb_sel_o : out std_logic_vector(1 downto 0);\r
86 wb_we_o : out std_logic;\r
87 wb_stb_o : inout std_logic; \r
88 wb_cyc_o : out std_logic;\r
89 wb_ack_i : in std_logic;\r
90 wb_err_i : in std_logic; \r
91 -- debug signals\r
92 debug_init : out std_logic;\r
93 debug_access : out std_logic \r
94); \r
95end pciwbsequ;\r
96\r
97\r
98architecture rtl of pciwbsequ is\r
99\r
100\r
101--+-----------------------------------------------------------------------------+\r
102--| COMPONENTS |\r
103--+-----------------------------------------------------------------------------+\r
104--+-----------------------------------------------------------------------------+\r
105--| CONSTANTS |\r
106--+-----------------------------------------------------------------------------+\r
107--+-----------------------------------------------------------------------------+\r
108--| SIGNALS |\r
109--+-----------------------------------------------------------------------------+\r
110\r
111 type PciFSM is ( PCIIDLE, B_BUSY, S_DATA1, S_DATA2, TURN_AR ); \r
112 signal pst_pci : PciFSM;\r
113 signal nxt_pci : PciFSM;\r
114\r
115 signal sdata1 : std_logic;\r
116 signal sdata2 : std_logic;\r
117 signal idleNX : std_logic;\r
118 signal sdata1NX : std_logic;\r
119 signal sdata2NX : std_logic;\r
120 signal turnarNX : std_logic;\r
121 signal idle : std_logic;\r
122 signal devselNX_n : std_logic;\r
123 signal trdyNX_n : std_logic;\r
124 signal devsel : std_logic;\r
125 signal trdy : std_logic;\r
126 signal adrpci : std_logic;\r
127 signal acking : std_logic;\r
128 signal rdcfg : std_logic;\r
129 signal targOE : std_logic;\r
130 signal pcidOE : std_logic;\r
131\r
132\r
133begin\r
134 \r
135 --+-------------------------------------------------------------------------+\r
136 --| PCI-Whisbone Sequencer |\r
137 --+-------------------------------------------------------------------------+\r
138 \r
139 \r
140 --+-------------------------------------------------------------+\r
141 --| FSM PCI-Whisbone |\r
142 --+-------------------------------------------------------------+\r
143 \r
144 PCIFSM_CLOCKED: process( nrst_i, clk_i, nxt_pci )\r
145 begin\r
146 \r
147 if( nrst_i = '0' ) then\r
148 pst_pci <= PCIIDLE;\r
149 elsif( rising_edge(clk_i) ) then\r
150 pst_pci <= nxt_pci; \r
151 end if;\r
152 \r
153 end process PCIFSM_CLOCKED;\r
154\r
155\r
156 PCIFSM_COMB: process( pst_pci, frame_i, irdy_i, adrcfg_i, adrpci, acking )\r
157 begin\r
158 \r
159 devselNX_n <= '1';\r
160 trdyNX_n <= '1'; \r
161 case pst_pci is\r
162\r
163 when PCIIDLE =>\r
164 if ( frame_i = '0' ) then \r
165 nxt_pci <= B_BUSY; \r
166 else\r
167 nxt_pci <= PCIIDLE;\r
168 end if; \r
169 \r
170 when B_BUSY =>\r
171 if ( adrpci = '0' ) then\r
172 nxt_pci <= TURN_AR;\r
173 else\r
174 nxt_pci <= S_DATA1;\r
175 devselNX_n <= '0'; \r
176 end if;\r
177\r
178 when S_DATA1 =>\r
179 if ( acking = '1' ) then \r
180 nxt_pci <= S_DATA2;\r
181 devselNX_n <= '0'; \r
182 trdyNX_n <= '0'; \r
183 else\r
184 nxt_pci <= S_DATA1;\r
185 devselNX_n <= '0'; \r
186 end if; \r
187 \r
188 when S_DATA2 => \r
189 if ( frame_i = '1' and irdy_i = '0' ) then \r
190 nxt_pci <= TURN_AR;\r
191 else\r
192 nxt_pci <= S_DATA2;\r
193 devselNX_n <= '0'; \r
194 trdyNX_n <= '0'; \r
195 end if; \r
196 \r
197 when TURN_AR =>\r
198 if ( frame_i = '1' ) then\r
199 nxt_pci <= PCIIDLE;\r
200 else\r
201 nxt_pci <= TURN_AR;\r
202 end if;\r
203 \r
204 end case;\r
205 \r
206 end process PCIFSM_COMB; \r
207\r
208\r
209 --+-------------------------------------------------------------+\r
210 --| FSM control signals |\r
211 --+-------------------------------------------------------------+\r
212\r
213 adrpci <= adrmem_i or adrcfg_i;\r
214 acking <= '1' when ( wb_ack_i = '1' or wb_err_i = '1' ) or ( adrcfg_i = '1' and irdy_i = '0')\r
215 else '0'; \r
216\r
217\r
218 --+-------------------------------------------------------------+\r
219 --| FSM derived Control signals |\r
220 --+-------------------------------------------------------------+\r
221 idle <= '1' when ( pst_pci = PCIIDLE ) else '0';\r
222 sdata1 <= '1' when ( pst_pci = S_DATA1 ) else '0';\r
223 sdata2 <= '1' when ( pst_pci = S_DATA2 ) else '0';\r
224 idleNX <= '1' when ( nxt_pci = PCIIDLE ) else '0';\r
225 sdata1NX <= '1' when ( nxt_pci = S_DATA1 ) else '0'; \r
226 sdata2NX <= '1' when ( nxt_pci = S_DATA2 ) else '0';\r
227 turnarNX <= '1' when ( nxt_pci = TURN_AR ) else '0';\r
228 \r
229\r
230\r
231 --+-------------------------------------------------------------+\r
232 --| PCI Data Output Enable |\r
233 --+-------------------------------------------------------------+\r
234\r
235 PCIDOE_P: process( nrst_i, clk_i, cmd_i(0), sdata1NX, turnarNX )\r
236 begin\r
237\r
238 if ( nrst_i = '0' ) then \r
239 pcidOE <= '0';\r
240 elsif ( rising_edge(clk_i) ) then \r
241\r
242 if ( sdata1NX = '1' and cmd_i(0) = '0' ) then\r
243 pcidOE <= '1';\r
244 elsif ( turnarNX = '1' ) then\r
245 pcidOE <= '0';\r
246 end if; \r
247 \r
248 end if;\r
249\r
250 end process PCIDOE_P;\r
251\r
252 pcidOE_o <= pcidOE;\r
253\r
254\r
255 --+-------------------------------------------------------------+\r
256 --| PAR Output Enable |\r
257 --| PCI Read data phase |\r
258 --| PAR is valid 1 cicle after data is valid |\r
259 --+-------------------------------------------------------------+\r
260\r
261 PAROE_P: process( nrst_i, clk_i, cmd_i(0), sdata2NX, turnarNX )\r
262 begin\r
263\r
264 if ( nrst_i = '0' ) then \r
265 parOE_o <= '0';\r
266 elsif ( rising_edge(clk_i) ) then \r
267\r
268 if ( ( sdata2NX = '1' or turnarNX = '1' ) and cmd_i(0) = '0' ) then\r
269 parOE_o <= '1';\r
270 else\r
271 parOE_o <= '0';\r
272 end if; \r
273 \r
274 end if;\r
275 \r
276 end process PAROE_P;\r
277\r
278 \r
279 --+-------------------------------------------------------------+\r
280 --| Target s/t/s signals OE control |\r
281 --+-------------------------------------------------------------+\r
282\r
283-- targOE <= '1' when ( idle = '0' and adrpci = '1' ) else '0';\r
284 TARGOE_P: process( nrst_i, clk_i, sdata1NX, idleNX )\r
285 begin\r
286\r
287 if ( nrst_i = '0' ) then \r
288 targOE <= '0';\r
289 elsif ( rising_edge(clk_i) ) then \r
290\r
291 if ( sdata1NX = '1' ) then\r
292 targOE <= '1';\r
293 elsif ( idleNX = '1' ) then\r
294 targOE <= '0';\r
295 end if; \r
296 \r
297 end if;\r
298\r
299 end process TARGOE_P;\r
300 \r
301\r
302 --+-------------------------------------------------------------------------+\r
303 --| WHISBONE outs |\r
304 --+-------------------------------------------------------------------------+\r
305 \r
306 wb_cyc_o <= '1' when ( adrmem_i = '1' and sdata1 = '1' ) else '0';\r
307 wb_stb_o <= '1' when ( adrmem_i = '1' and sdata1 = '1' and irdy_i = '0' ) else '0';\r
308\r
309 -- PCI(Little endian) to WB(Big endian)\r
310 wb_sel_o(1) <= (not cbe_i(0)) or (not cbe_i(2));\r
311 wb_sel_o(0) <= (not cbe_i(1)) or (not cbe_i(3)); \r
312 -- \r
313 wb_we_o <= cmd_i(0);\r
314 \r
315\r
316 --+-------------------------------------------------------------------------+\r
317 --| Syncronized PCI outs |\r
318 --+-------------------------------------------------------------------------+\r
319 \r
320 PCISIG: process( nrst_i, clk_i, devselNX_n, trdyNX_n)\r
321 begin\r
322\r
323 if( nrst_i = '0' ) then \r
324 devsel <= '1';\r
325 trdy <= '1';\r
326 elsif( rising_edge(clk_i) ) then \r
327 \r
328 devsel <= devselNX_n;\r
329 trdy <= trdyNX_n;\r
330 \r
331 end if;\r
332 \r
333 end process PCISIG;\r
334\r
335 devsel_o <= devsel when ( targOE = '1' ) else 'Z';\r
336 trdy_o <= trdy when ( targOE = '1' ) else 'Z';\r
337 \r
338\r
339 --+-------------------------------------------------------------------------+\r
340 --| Other outs |\r
341 --+-------------------------------------------------------------------------+\r
342\r
343 -- rd/wr Configuration Space Registers\r
344 wrcfg_o <= '1' when ( adrcfg_i = '1' and cmd_i(0) = '1' and sdata2 = '1' ) else '0';\r
345 rdcfg <= '1' when ( adrcfg_i = '1' and cmd_i(0) = '0' and ( sdata1 = '1' or sdata2 = '1' ) ) else '0';\r
346 rdcfg_o <= rdcfg;\r
347 \r
348 -- LoaD enable signals\r
349 pciadrLD_o <= not frame_i;\r
350 wbdatLD_o <= wb_ack_i;\r
351\r
352 -- Mux control signals\r
353 wbrgdMX_o <= not rdcfg;\r
354 wbd16MX_o <= '1' when ( cbe_i(3) = '0' or cbe_i(2) = '0' ) else '0';\r
355 \r
356 --+-------------------------------------------------------------------------+\r
357 --| debug outs |\r
358 --+-------------------------------------------------------------------------+\r
359 \r
360 process (nrst_i, clk_i)\r
361 begin\r
362 if ( nrst_i = '0' ) then\r
363 debug_init <= '0';\r
364 elsif clk_i'event and clk_i = '1' then\r
365 if devsel = '0' then\r
366 debug_init <= '1';\r
367 end if;\r
368 end if;\r
369 end process; \r
370 \r
371 process (nrst_i, clk_i)\r
372 begin\r
373 if ( nrst_i = '0' ) then\r
374 debug_access <= '0';\r
375 elsif clk_i'event and clk_i = '1' then\r
376 if wb_stb_o = '1' then\r
377 debug_access <= '1';\r
378 end if;\r
379 end if;\r
380 end process; \r
381\r
382end rtl;\r
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