[raggedstone] / dhwk_old / source / pciwbsequ.vhd

--+-------------------------------------------------------------------------------------------------+\r
--|																									|\r
--|  File:			pciwbsequ.vhd                                                          			|\r
--|																									|\r
--|  Project:		pci32tlite_oc																	|\r
--|																									|\r
--|  Description: 	FSM controlling PCI to Whisbone sequence. 										|\r
--|	 																								|\r
--+-------------------------------------------------------------------------------------------------+\r
--|																									|\r
--|  Revision history :																				|\r
--|  Date 		  Version	Author	Description														|\r
--|  2005-05-13   R00A00    PAU		First alfa revision	(eng)										|\r
--|  2006-01-09             MS      added debug signals debug_init, debug_access					|																			|\r
--|																									|\r
--|  To do:	 																						|\r
--|																									|\r
--+-------------------------------------------------------------------------------------------------+\r
--+-----------------------------------------------------------------+\r
--| 																|\r
--|  Copyright (C) 2005 Peio Azkarate, peio@opencores.org   		| \r
--| 																|\r
--|  This source file may be used and distributed without     		|\r
--|  restriction provided that this copyright statement is not		|\r
--|  removed from the file and that any derivative work contains	|\r
--|  the original copyright notice and the associated disclaimer.	|\r
--|                                                              	|\r
--|  This source file is free software; you can redistribute it     |\r
--|  and/or modify it under the terms of the GNU Lesser General     |\r
--|  Public License as published by the Free Software Foundation;   |\r
--|  either version 2.1 of the License, or (at your option) any     |\r
--|  later version.                                                 |\r
--| 																|\r
--|  This source is distributed in the hope that it will be         |\r
--|  useful, but WITHOUT ANY WARRANTY; without even the implied     |\r
--|  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR        |\r
--|  PURPOSE.  See the GNU Lesser General Public License for more   |\r
--|  details.                                                       |\r
--| 																|\r
--|  You should have received a copy of the GNU Lesser General      |\r
--|  Public License along with this source; if not, download it     |\r
--|  from http://www.opencores.org/lgpl.shtml                       |\r
--| 																|\r
--+-----------------------------------------------------------------+ \r
\r
\r
--+-----------------------------------------------------------------------------+\r
--|									LIBRARIES									|\r
--+-----------------------------------------------------------------------------+\r
\r
library ieee;\r
use ieee.std_logic_1164.all;\r
\r
\r
--+-----------------------------------------------------------------------------+\r
--|									ENTITY   									|\r
--+-----------------------------------------------------------------------------+\r
\r
entity pciwbsequ is\r
port (\r
\r
   	-- General \r
    clk_i       	: in std_logic;\r
   	nrst_i       	: in std_logic;\r
	-- pci \r
	--adr_i\r
	cmd_i			: in std_logic_vector(3 downto 0);\r
	cbe_i			: in std_logic_vector(3 downto 0);\r
	frame_i    	 	: in std_logic;\r
	irdy_i        	: in std_logic;\r
	devsel_o		: out std_logic;\r
	trdy_o        	: out std_logic;\r
	-- control\r
	adrcfg_i		: in std_logic;\r
	adrmem_i 		: in std_logic;\r
	pciadrLD_o	   	: out std_logic;\r
	pcidOE_o	   	: out std_logic;\r
	parOE_o			: out std_logic;\r
	wbdatLD_o   	: out std_logic;\r
	wbrgdMX_o   	: out std_logic;\r
	wbd16MX_o   	: out std_logic;	\r
	wrcfg_o 		: out std_logic;\r
	rdcfg_o 		: out std_logic;\r
	-- whisbone\r
	wb_sel_o		: out std_logic_vector(1 downto 0);\r
	wb_we_o			: out std_logic;\r
	wb_stb_o		: inout std_logic;	\r
	wb_cyc_o		: out std_logic;\r
	wb_ack_i		: in std_logic;\r
	wb_err_i		: in std_logic;	\r
	-- debug signals\r
	debug_init	 : out std_logic;\r
	debug_access : out std_logic \r
);   \r
end pciwbsequ;\r
\r
\r
architecture rtl of pciwbsequ is\r
\r
\r
--+-----------------------------------------------------------------------------+\r
--|									COMPONENTS									|\r
--+-----------------------------------------------------------------------------+\r
--+-----------------------------------------------------------------------------+\r
--|									CONSTANTS  									|\r
--+-----------------------------------------------------------------------------+\r
--+-----------------------------------------------------------------------------+\r
--|									SIGNALS   									|\r
--+-----------------------------------------------------------------------------+\r
\r
	type PciFSM is ( PCIIDLE, B_BUSY, S_DATA1, S_DATA2, TURN_AR );	\r
  	signal pst_pci 		: PciFSM;\r
  	signal nxt_pci 		: PciFSM;\r
\r
  	signal sdata1		: std_logic;\r
  	signal sdata2		: std_logic;\r
	signal idleNX		: std_logic;\r
	signal sdata1NX		: std_logic;\r
	signal sdata2NX		: std_logic;\r
	signal turnarNX		: std_logic;\r
	signal idle			: std_logic;\r
  	signal devselNX_n	: std_logic;\r
  	signal trdyNX_n		: std_logic;\r
  	signal devsel		: std_logic;\r
  	signal trdy			: std_logic;\r
  	signal adrpci		: std_logic;\r
  	signal acking		: std_logic;\r
  	signal rdcfg		: std_logic;\r
	signal targOE		: std_logic;\r
	signal pcidOE		: std_logic;\r
\r
\r
begin\r
	\r
    --+-------------------------------------------------------------------------+\r
    --|  PCI-Whisbone Sequencer													|\r
    --+-------------------------------------------------------------------------+\r
	\r
	\r
    --+-------------------------------------------------------------+\r
	--|  FSM PCI-Whisbone											|\r
    --+-------------------------------------------------------------+\r
		\r
	PCIFSM_CLOCKED: process( nrst_i, clk_i, nxt_pci )\r
	begin\r
	\r
    	if( nrst_i = '0' ) then\r
			pst_pci <= PCIIDLE;\r
  		elsif( rising_edge(clk_i) ) then\r
			pst_pci <= nxt_pci; \r
        end if;\r
    \r
	end process PCIFSM_CLOCKED;\r
\r
\r
  	PCIFSM_COMB: process( pst_pci, frame_i, irdy_i, adrcfg_i, adrpci, acking )\r
	begin\r
		\r
		devselNX_n 	<= '1';\r
		trdyNX_n 	<= '1';	\r
    	case pst_pci is\r
\r
	    	when PCIIDLE =>\r
	       		if ( frame_i = '0' ) then	\r
					nxt_pci <= B_BUSY; 	\r
				else\r
					nxt_pci <= PCIIDLE;\r
				end if;		\r
				\r
            when B_BUSY =>\r
				if ( adrpci = '0' ) then\r
					nxt_pci <= TURN_AR;\r
				else\r
					nxt_pci <= S_DATA1;\r
					devselNX_n <= '0'; \r
				end if;\r
\r
		    when S_DATA1 =>\r
	       		if ( acking = '1' ) then	\r
					nxt_pci 	<= S_DATA2;\r
					devselNX_n 	<= '0'; 					\r
					trdyNX_n 	<= '0';	\r
				else\r
					nxt_pci <= S_DATA1;\r
					devselNX_n <= '0'; 					\r
				end if;		\r
								\r
		    when S_DATA2 => \r
	       		if ( frame_i = '1' and irdy_i = '0' ) then	\r
					nxt_pci <= TURN_AR;\r
				else\r
					nxt_pci <= S_DATA2;\r
					devselNX_n <= '0'; 					\r
					trdyNX_n <= '0';	\r
				end if;		\r
				\r
			when TURN_AR =>\r
				if ( frame_i = '1' ) then\r
					nxt_pci <= PCIIDLE;\r
				else\r
					nxt_pci <= TURN_AR;\r
				end if;\r
				\r
	    end case;\r
        \r
	end process PCIFSM_COMB;	\r
\r
\r
    --+-------------------------------------------------------------+\r
	--|  FSM control signals										|\r
    --+-------------------------------------------------------------+\r
\r
	adrpci <= adrmem_i or adrcfg_i;\r
	acking <= '1' when ( wb_ack_i = '1' or wb_err_i = '1' ) or ( adrcfg_i = '1' and  irdy_i = '0')\r
				  else '0'; \r
\r
\r
    --+-------------------------------------------------------------+\r
	--|  FSM derived Control signals								|\r
    --+-------------------------------------------------------------+\r
	idle 		<= '1' when ( pst_pci = PCIIDLE ) else '0';\r
	sdata1 		<= '1' when ( pst_pci = S_DATA1 ) else '0';\r
	sdata2 		<= '1' when ( pst_pci = S_DATA2 ) else '0';\r
	idleNX 		<= '1' when ( nxt_pci = PCIIDLE ) else '0';\r
	sdata1NX 	<= '1' when ( nxt_pci = S_DATA1 ) else '0';	\r
	sdata2NX 	<= '1' when ( nxt_pci = S_DATA2 ) else '0';\r
	turnarNX 	<= '1' when ( nxt_pci = TURN_AR ) else '0';\r
	\r
\r
\r
    --+-------------------------------------------------------------+\r
	--|  PCI Data Output Enable										|\r
    --+-------------------------------------------------------------+\r
\r
	PCIDOE_P: process( nrst_i, clk_i, cmd_i(0), sdata1NX, turnarNX )\r
	begin\r
\r
    	if ( nrst_i = '0' ) then \r
			pcidOE <= '0';\r
  		elsif ( rising_edge(clk_i) ) then \r
\r
			if ( sdata1NX = '1' and cmd_i(0) = '0' ) then\r
				pcidOE <= '1';\r
			elsif ( turnarNX = '1' ) then\r
				pcidOE <= '0';\r
			end if;			\r
			\r
        end if;\r
\r
	end process PCIDOE_P;\r
\r
	pcidOE_o <= pcidOE;\r
\r
\r
    --+-------------------------------------------------------------+\r
	--|  PAR Output Enable											|\r
	--|  PCI Read data phase										|\r
	--|  PAR is valid 1 cicle after data is valid					|\r
    --+-------------------------------------------------------------+\r
\r
	PAROE_P: process( nrst_i, clk_i, cmd_i(0), sdata2NX, turnarNX )\r
	begin\r
\r
    	if ( nrst_i = '0' ) then \r
			parOE_o <= '0';\r
  		elsif ( rising_edge(clk_i) ) then \r
\r
			if ( ( sdata2NX = '1' or turnarNX = '1' ) and cmd_i(0) = '0' ) then\r
				parOE_o <= '1';\r
			else\r
				parOE_o <= '0';\r
			end if;			\r
			\r
        end if;\r
		\r
	end process PAROE_P;\r
\r
	\r
    --+-------------------------------------------------------------+\r
	--|  Target s/t/s signals OE control							|\r
    --+-------------------------------------------------------------+\r
\r
--	targOE <= '1' when ( idle = '0' and adrpci = '1' ) else '0';\r
	TARGOE_P: process( nrst_i, clk_i, sdata1NX, idleNX )\r
	begin\r
\r
    	if ( nrst_i = '0' ) then \r
			targOE <= '0';\r
  		elsif ( rising_edge(clk_i) ) then \r
\r
			if ( sdata1NX = '1' ) then\r
				targOE <= '1';\r
			elsif ( idleNX = '1' ) then\r
				targOE <= '0';\r
			end if;			\r
			\r
        end if;\r
\r
	end process TARGOE_P;\r
		\r
\r
    --+-------------------------------------------------------------------------+\r
    --|  WHISBONE outs															|\r
    --+-------------------------------------------------------------------------+\r
				\r
	wb_cyc_o <= '1' when ( adrmem_i = '1' and sdata1 = '1' ) else '0';\r
    wb_stb_o <= '1' when ( adrmem_i = '1' and sdata1 = '1' and irdy_i = '0' ) else '0';\r
\r
	-- PCI(Little endian) to WB(Big endian)\r
	wb_sel_o(1) <= (not cbe_i(0)) or (not cbe_i(2));\r
	wb_sel_o(0) <= (not cbe_i(1)) or (not cbe_i(3));	\r
	-- \r
	wb_we_o <= cmd_i(0);\r
	\r
\r
    --+-------------------------------------------------------------------------+\r
	--|  Syncronized PCI outs													|\r
    --+-------------------------------------------------------------------------+\r
	\r
	PCISIG: process( nrst_i, clk_i, devselNX_n, trdyNX_n)\r
	begin\r
\r
		if( nrst_i = '0' ) then \r
			devsel 		<= '1';\r
			trdy 		<= '1';\r
		elsif( rising_edge(clk_i) ) then \r
		\r
			devsel 		<= devselNX_n;\r
			trdy 		<= trdyNX_n;\r
			\r
		end if;\r
		\r
	end process PCISIG;\r
\r
	devsel_o <= devsel when ( targOE = '1' ) else 'Z';\r
	trdy_o   <= trdy   when ( targOE = '1' ) else 'Z';\r
	\r
\r
    --+-------------------------------------------------------------------------+\r
	--|  Other outs																|\r
    --+-------------------------------------------------------------------------+\r
\r
	--  rd/wr Configuration Space Registers\r
	wrcfg_o <= '1' when ( adrcfg_i = '1' and cmd_i(0) = '1' and sdata2 = '1' ) else '0';\r
	rdcfg <= '1' when ( adrcfg_i = '1' and cmd_i(0) = '0' and ( sdata1 = '1' or sdata2 = '1' ) ) else '0';\r
	rdcfg_o <= rdcfg;\r
	\r
	-- LoaD enable signals\r
	pciadrLD_o <= not frame_i;\r
	wbdatLD_o  <= wb_ack_i;\r
\r
	-- Mux control signals\r
	wbrgdMX_o <= not rdcfg;\r
	wbd16MX_o <= '1' when ( cbe_i(3) = '0' or cbe_i(2) = '0' ) else '0';\r
	\r
    --+-------------------------------------------------------------------------+\r
	--|  debug outs 															|\r
    --+-------------------------------------------------------------------------+\r
	\r
	process (nrst_i, clk_i)\r
	begin\r
		if ( nrst_i = '0' ) then\r
			debug_init <= '0';\r
			elsif clk_i'event and clk_i = '1' then\r
				if devsel = '0' then\r
					debug_init <= '1';\r
				end if;\r
		end if;\r
	end process;	\r
	\r
	process (nrst_i, clk_i)\r
	begin\r
		if ( nrst_i = '0' ) then\r
			debug_access <= '0';\r
			elsif clk_i'event and clk_i = '1' then\r
				if wb_stb_o = '1' then\r
					debug_access <= '1';\r
				end if;\r
		end if;\r
	end process; \r
\r
end rtl;\r
Commit	Line	Data
ebba63a9	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
	51	library ieee;\r
	52	use ieee.std_logic_1164.all;\r
	53	\r
	54	\r
	55	--+-----------------------------------------------------------------------------+\r
	56	--\| ENTITY \|\r
	57	--+-----------------------------------------------------------------------------+\r
	58	\r
	59	entity pciwbsequ is\r
	60	port (\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
95	end pciwbsequ;\r
96	\r
97	\r
98	architecture 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
133	begin\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
382	end rtl;\r