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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: xpcs_dpath.v | |
4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved | |
5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. | |
6 | // | |
7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
8 | // | |
9 | // This program is free software; you can redistribute it and/or modify | |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; version 2 of the License. | |
12 | // | |
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | // | |
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | // | |
22 | // For the avoidance of doubt, and except that if any non-GPL license | |
23 | // choice is available it will apply instead, Sun elects to use only | |
24 | // the General Public License version 2 (GPLv2) at this time for any | |
25 | // software where a choice of GPL license versions is made | |
26 | // available with the language indicating that GPLv2 or any later version | |
27 | // may be used, or where a choice of which version of the GPL is applied is | |
28 | // otherwise unspecified. | |
29 | // | |
30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
31 | // CA 95054 USA or visit www.sun.com if you need additional information or | |
32 | // have any questions. | |
33 | // | |
34 | // ========== Copyright Header End ============================================ | |
35 | module xpcs_dpath ( tx_clk, rx_clk, rbc0_b, rbc0_c, rbc0_d, | |
36 | csr_loopback, csr_enable_tx_buffers, | |
37 | tx_symbols_mux, rx_symbols_mux, | |
38 | rx_symbols_dft, tx_symbols_dft, | |
39 | rx_symbols_dft_dummy, | |
40 | xrx_code_group_muxout, xtx_code_group); | |
41 | ||
42 | input tx_clk; | |
43 | ||
44 | input rx_clk; // rbc0_a 312 Mhz rx clock from serdes | |
45 | input rbc0_b; // 312 Mhz rx clock from serdes | |
46 | input rbc0_c; // 312 Mhz rx clock from serdes | |
47 | input rbc0_d; // 312 Mhz rx clock from serdes | |
48 | ||
49 | input csr_loopback; | |
50 | input csr_enable_tx_buffers; | |
51 | input [39:0] tx_symbols_mux; | |
52 | input [39:0] rx_symbols_mux; | |
53 | ||
54 | input [39:0] rx_symbols_dft; | |
55 | ||
56 | output [39:0] tx_symbols_dft; | |
57 | ||
58 | output [39:0] xrx_code_group_muxout; | |
59 | output [39:0] xtx_code_group; | |
60 | ||
61 | output rx_symbols_dft_dummy; | |
62 | ||
63 | reg [39:0] xtx_code_group; | |
64 | reg [39:0] rx_symbols_reg; | |
65 | ||
66 | reg [39:0] rx_symbols_dft_reg; | |
67 | reg [39:0] tx_symbols_dft; | |
68 | ||
69 | reg rx_symbols_dft_dummy; | |
70 | ||
71 | wire [39:0] xrx_code_group_muxout; | |
72 | ||
73 | wire [9:0] rx_symbol_0; | |
74 | wire [9:0] rx_symbol_1; | |
75 | wire [9:0] rx_symbol_2; | |
76 | wire [9:0] rx_symbol_3; | |
77 | ||
78 | wire [9:0] tx_symbol_0; | |
79 | wire [9:0] tx_symbol_1; | |
80 | wire [9:0] tx_symbol_2; | |
81 | wire [9:0] tx_symbol_3; | |
82 | ||
83 | ||
84 | // ***************************************************************************** | |
85 | // Flip data msb -> lsb per Symbol and Register receive data from serdes | |
86 | // ***************************************************************************** | |
87 | ||
88 | assign rx_symbol_3 = {rx_symbols_mux[30], | |
89 | rx_symbols_mux[31], | |
90 | rx_symbols_mux[32], | |
91 | rx_symbols_mux[33], | |
92 | rx_symbols_mux[34], | |
93 | rx_symbols_mux[35], | |
94 | rx_symbols_mux[36], | |
95 | rx_symbols_mux[37], | |
96 | rx_symbols_mux[38], | |
97 | rx_symbols_mux[39]}; | |
98 | ||
99 | assign rx_symbol_2 = {rx_symbols_mux[20], | |
100 | rx_symbols_mux[21], | |
101 | rx_symbols_mux[22], | |
102 | rx_symbols_mux[23], | |
103 | rx_symbols_mux[24], | |
104 | rx_symbols_mux[25], | |
105 | rx_symbols_mux[26], | |
106 | rx_symbols_mux[27], | |
107 | rx_symbols_mux[28], | |
108 | rx_symbols_mux[29]}; | |
109 | ||
110 | assign rx_symbol_1 = {rx_symbols_mux[10], | |
111 | rx_symbols_mux[11], | |
112 | rx_symbols_mux[12], | |
113 | rx_symbols_mux[13], | |
114 | rx_symbols_mux[14], | |
115 | rx_symbols_mux[15], | |
116 | rx_symbols_mux[16], | |
117 | rx_symbols_mux[17], | |
118 | rx_symbols_mux[18], | |
119 | rx_symbols_mux[19]}; | |
120 | ||
121 | assign rx_symbol_0 = {rx_symbols_mux[0], | |
122 | rx_symbols_mux[1], | |
123 | rx_symbols_mux[2], | |
124 | rx_symbols_mux[3], | |
125 | rx_symbols_mux[4], | |
126 | rx_symbols_mux[5], | |
127 | rx_symbols_mux[6], | |
128 | rx_symbols_mux[7], | |
129 | rx_symbols_mux[8], | |
130 | rx_symbols_mux[9]}; | |
131 | ||
132 | always @ (posedge rx_clk) | |
133 | begin | |
134 | rx_symbols_reg[9:0] <= rx_symbol_0 ; | |
135 | end | |
136 | ||
137 | always @ (posedge rbc0_b) | |
138 | begin | |
139 | rx_symbols_reg[19:10] <= rx_symbol_1 ; | |
140 | end | |
141 | ||
142 | always @ (posedge rbc0_c) | |
143 | begin | |
144 | rx_symbols_reg[29:20] <= rx_symbol_2 ; | |
145 | end | |
146 | ||
147 | always @ (posedge rbc0_d) | |
148 | begin | |
149 | rx_symbols_reg[39:30] <= rx_symbol_3 ; | |
150 | end | |
151 | ||
152 | ||
153 | // ***************************************************************************** | |
154 | // Flip data msb -> lsb per Symbol and Register transmit data to serdes | |
155 | // ***************************************************************************** | |
156 | ||
157 | assign tx_symbol_3 = {tx_symbols_mux[30], | |
158 | tx_symbols_mux[31], | |
159 | tx_symbols_mux[32], | |
160 | tx_symbols_mux[33], | |
161 | tx_symbols_mux[34], | |
162 | tx_symbols_mux[35], | |
163 | tx_symbols_mux[36], | |
164 | tx_symbols_mux[37], | |
165 | tx_symbols_mux[38], | |
166 | tx_symbols_mux[39]}; | |
167 | ||
168 | assign tx_symbol_2 = {tx_symbols_mux[20], | |
169 | tx_symbols_mux[21], | |
170 | tx_symbols_mux[22], | |
171 | tx_symbols_mux[23], | |
172 | tx_symbols_mux[24], | |
173 | tx_symbols_mux[25], | |
174 | tx_symbols_mux[26], | |
175 | tx_symbols_mux[27], | |
176 | tx_symbols_mux[28], | |
177 | tx_symbols_mux[29]}; | |
178 | ||
179 | assign tx_symbol_1 = {tx_symbols_mux[10], | |
180 | tx_symbols_mux[11], | |
181 | tx_symbols_mux[12], | |
182 | tx_symbols_mux[13], | |
183 | tx_symbols_mux[14], | |
184 | tx_symbols_mux[15], | |
185 | tx_symbols_mux[16], | |
186 | tx_symbols_mux[17], | |
187 | tx_symbols_mux[18], | |
188 | tx_symbols_mux[19]}; | |
189 | ||
190 | assign tx_symbol_0 = {tx_symbols_mux[0], | |
191 | tx_symbols_mux[1], | |
192 | tx_symbols_mux[2], | |
193 | tx_symbols_mux[3], | |
194 | tx_symbols_mux[4], | |
195 | tx_symbols_mux[5], | |
196 | tx_symbols_mux[6], | |
197 | tx_symbols_mux[7], | |
198 | tx_symbols_mux[8], | |
199 | tx_symbols_mux[9]}; | |
200 | ||
201 | always @ (posedge tx_clk) | |
202 | xtx_code_group <= csr_enable_tx_buffers ? {tx_symbol_3, | |
203 | tx_symbol_2, | |
204 | tx_symbol_1, | |
205 | tx_symbol_0} : 40'b0 ; | |
206 | ||
207 | ||
208 | // ********************************************************************** | |
209 | // Loopback Mux | |
210 | // ********************************************************************** | |
211 | ||
212 | assign xrx_code_group_muxout = csr_loopback ? tx_symbols_mux : rx_symbols_reg ; | |
213 | ||
214 | ||
215 | // ********************************************************************** | |
216 | // NEC serdes dft requires registering unused Serdes inputs and outputs | |
217 | // ********************************************************************** | |
218 | ||
219 | always @ (posedge tx_clk) | |
220 | tx_symbols_dft <= 40'h0000000000; | |
221 | ||
222 | ||
223 | always @ (posedge rx_clk) | |
224 | begin | |
225 | rx_symbols_dft_reg[9:0] <= rx_symbols_dft[9:0] ; | |
226 | end | |
227 | ||
228 | always @ (posedge rbc0_b) | |
229 | begin | |
230 | rx_symbols_dft_reg[19:10] <= rx_symbols_dft[19:10] ; | |
231 | end | |
232 | ||
233 | always @ (posedge rbc0_c) | |
234 | begin | |
235 | rx_symbols_dft_reg[29:20] <= rx_symbols_dft[29:20] ; | |
236 | end | |
237 | ||
238 | always @ (posedge rbc0_d) | |
239 | begin | |
240 | rx_symbols_dft_reg[39:30] <= rx_symbols_dft[39:30] ; | |
241 | end | |
242 | ||
243 | ||
244 | // summit modcovoff -bpe | |
245 | ||
246 | always @ (posedge rx_clk) | |
247 | begin | |
248 | rx_symbols_dft_dummy <= |rx_symbols_dft_reg ; | |
249 | end | |
250 | ||
251 | // summit modcovon -bpe | |
252 | ||
253 | ||
254 | ||
255 | ||
256 | endmodule |