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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: ccu_hm_align_det.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 | `timescale 1 ns / 1ps | |
36 | ||
37 | module ccu_hm_align_det ( | |
38 | ref_clk, | |
39 | fast_clk, | |
40 | rst_n, | |
41 | aligned | |
42 | ); | |
43 | ||
44 | ||
45 | input ref_clk; | |
46 | input fast_clk; | |
47 | input rst_n; | |
48 | output aligned; | |
49 | ||
50 | wire ref_clk; | |
51 | wire fast_clk; | |
52 | wire rst_n; | |
53 | wire aligned; | |
54 | ||
55 | ||
56 | // inferred flops | |
57 | /* | |
58 | reg ref_q1_n; | |
59 | reg ref_q2_n; | |
60 | reg ref_q3; | |
61 | reg ref_q4; | |
62 | reg ref_q5; | |
63 | */ | |
64 | ||
65 | wire ref_q1_n; | |
66 | wire ref_q2_n; | |
67 | wire ref_q3; | |
68 | wire ref_q4; | |
69 | wire ref_q5; | |
70 | ||
71 | wire rst; | |
72 | wire fast_clk_n; | |
73 | wire ref_q5_in; | |
74 | ||
75 | ||
76 | // inferred flops | |
77 | /* | |
78 | always @ (negedge fast_clk or negedge rst_n) begin | |
79 | if (!rst_n) begin | |
80 | ref_q1_n <= 1'b0; | |
81 | ref_q2_n <= 1'b0; | |
82 | end else begin | |
83 | ref_q1_n <= ref_clk; | |
84 | ref_q2_n <= ref_q1_n; | |
85 | end | |
86 | end | |
87 | */ | |
88 | ||
89 | // BEGIN_ECO | |
90 | // POST TAPEOUT ECO - N2 BUG .... | |
91 | wire ref_clk_n; | |
92 | wire rst_n_synced; | |
93 | ||
94 | assign ref_clk_n = ~ref_clk; | |
95 | cl_a1_clksyncff_4x bf_arst_sync ( | |
96 | .l1clk (ref_clk_n), .d (rst_n), .q (rst_n_synced), | |
97 | .siclk( 1'b0 ), .soclk( 1'b0 ), .si (1'b0), .so () | |
98 | ); | |
99 | assign rst = ~(rst_n_synced & rst_n); | |
100 | // END_ECO | |
101 | ||
102 | assign fast_clk_n = ~fast_clk; | |
103 | ||
104 | my_msff_arst_4x stg1_n ( | |
105 | .l1clk (fast_clk_n), | |
106 | .reset (rst), | |
107 | .d (ref_clk), | |
108 | .q (ref_q1_n), | |
109 | .siclk (1'b0), | |
110 | .soclk (1'b0), | |
111 | .si (1'b0), | |
112 | .so () | |
113 | ); | |
114 | ||
115 | my_msff_arst_4x stg2_n ( | |
116 | .l1clk (fast_clk_n), | |
117 | .reset (rst), | |
118 | .d (ref_q1_n), | |
119 | .q (ref_q2_n), | |
120 | .siclk (1'b0), | |
121 | .soclk (1'b0), | |
122 | .si (1'b0), | |
123 | .so () | |
124 | ); | |
125 | ||
126 | ||
127 | ||
128 | /* | |
129 | always @ (posedge fast_clk or negedge rst_n) begin | |
130 | if (!rst_n) begin | |
131 | ref_q3 <= 1'b0; | |
132 | ref_q4 <= 1'b0; | |
133 | ref_q5 <= 1'b0; | |
134 | end else begin // one half-cycle path | |
135 | ref_q3 <= ref_q2_n; | |
136 | ref_q4 <= ref_q3; | |
137 | ref_q5 <= ~ref_q4 & ref_q3; | |
138 | end | |
139 | end | |
140 | */ | |
141 | ||
142 | my_msff_arst_4x stg3 ( | |
143 | .l1clk (fast_clk), | |
144 | .reset (rst), | |
145 | .d (ref_q2_n), | |
146 | .q (ref_q3), | |
147 | .siclk (1'b0), | |
148 | .soclk (1'b0), | |
149 | .si (1'b0), | |
150 | .so () | |
151 | ); | |
152 | ||
153 | my_msff_arst_4x stg4 ( | |
154 | .l1clk (fast_clk), | |
155 | .reset (rst), | |
156 | .d (ref_q3), | |
157 | .q (ref_q4), | |
158 | .siclk (1'b0), | |
159 | .soclk (1'b0), | |
160 | .si (1'b0), | |
161 | .so () | |
162 | ); | |
163 | ||
164 | ||
165 | assign ref_q5_in = ~ref_q4 & ref_q3; | |
166 | ||
167 | /* | |
168 | my_msff_arst_4x stg5 ( | |
169 | .l1clk (fast_clk), | |
170 | .reset (rst), | |
171 | .d (ref_q5_in), | |
172 | .q (ref_q5), | |
173 | .siclk (1'b0), | |
174 | .soclk (1'b0), | |
175 | .si (1'b0), | |
176 | .so () | |
177 | ); | |
178 | */ | |
179 | ||
180 | assign aligned = ref_q5_in; | |
181 | ||
182 | ||
183 | ||
184 | endmodule | |
185 |