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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: lsu_lru8_ctl.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 lsu_lru8_ctl ( | |
36 | l1clk, | |
37 | scan_in, | |
38 | spc_aclk, | |
39 | spc_bclk, | |
40 | scan_out, | |
41 | request, | |
42 | enable, | |
43 | select); | |
44 | wire siclk; | |
45 | wire soclk; | |
46 | wire dff_lru_scanin; | |
47 | wire dff_lru_scanout; | |
48 | wire nlru0_7; | |
49 | wire nlru0_3; | |
50 | wire nlru4_7; | |
51 | wire nlru0_1; | |
52 | wire nlru2_3; | |
53 | wire nlru4_5; | |
54 | wire nlru6_7; | |
55 | wire lru0_7; | |
56 | wire lru0_3; | |
57 | wire lru4_7; | |
58 | wire lru0_1; | |
59 | wire lru2_3; | |
60 | wire lru4_5; | |
61 | wire lru6_7; | |
62 | wire pick_0123; | |
63 | wire pick_4567; | |
64 | wire pick_01; | |
65 | wire pick_23; | |
66 | wire pick_45; | |
67 | wire pick_67; | |
68 | wire pick_0; | |
69 | wire pick_1; | |
70 | wire pick_2; | |
71 | wire pick_3; | |
72 | wire pick_4; | |
73 | wire pick_5; | |
74 | wire pick_6; | |
75 | wire pick_7; | |
76 | ||
77 | ||
78 | input l1clk; | |
79 | input scan_in; | |
80 | input spc_aclk; | |
81 | input spc_bclk; | |
82 | output scan_out; | |
83 | ||
84 | input [7:0] request; | |
85 | input [7:0] enable; | |
86 | ||
87 | output [7:0] select; | |
88 | ||
89 | // scan renames | |
90 | assign siclk = spc_aclk; | |
91 | assign soclk = spc_bclk; | |
92 | // end scan | |
93 | ||
94 | //////////////////////////////////////////////////////////////////////////////// | |
95 | // Pseudo-LRU picker to choose the oldest thread for issuing to pcx. | |
96 | // The picker uses a binary tree to track age. | |
97 | // lru0_1 -> 0=#0 is newer, 1=#1 is newer | |
98 | // lru2_3 -> 0=#2 is newer, 1=#3 is newer | |
99 | // lru0_3 -> 0={0,1} is newer, 1={2,3} is newer | |
100 | // lru4_7 -> 0={4,5} is newer, 1={6,7} is newer | |
101 | // lru0_7 -> 0={0,1,2,3} is newer, 1={4,5,6,7} is newer | |
102 | // The state updates every time an entry is written. The "least recently written" | |
103 | // as determined by tracing the tree has priority. | |
104 | //////////////////////////////////////////////////////////////////////////////// | |
105 | ||
106 | lsu_lru8_ctl_msff_ctl_macro__width_7 dff_lru ( | |
107 | .scan_in(dff_lru_scanin), | |
108 | .scan_out(dff_lru_scanout), | |
109 | .din ({nlru0_7,nlru0_3,nlru4_7,nlru0_1,nlru2_3,nlru4_5,nlru6_7}), | |
110 | .dout ({ lru0_7, lru0_3, lru4_7, lru0_1, lru2_3, lru4_5, lru6_7}), | |
111 | .l1clk(l1clk), | |
112 | .siclk(siclk), | |
113 | .soclk(soclk) | |
114 | ); | |
115 | ||
116 | assign pick_0123 = (|request[3:0]) & ( lru0_7 | ~(|request[7:4])); | |
117 | assign pick_4567 = (|request[7:4]) & (~lru0_7 | ~(|request[3:0])); | |
118 | assign pick_01 = (|request[1:0]) & ( lru0_3 | ~(|request[3:2])); | |
119 | assign pick_23 = (|request[3:2]) & (~lru0_3 | ~(|request[1:0])); | |
120 | assign pick_45 = (|request[5:4]) & ( lru4_7 | ~(|request[7:6])); | |
121 | assign pick_67 = (|request[7:6]) & (~lru4_7 | ~(|request[5:4])); | |
122 | assign pick_0 = request[0] & ( lru0_1 | ~request[1]); | |
123 | assign pick_1 = request[1] & (~lru0_1 | ~request[0]); | |
124 | assign pick_2 = request[2] & ( lru2_3 | ~request[3]); | |
125 | assign pick_3 = request[3] & (~lru2_3 | ~request[2]); | |
126 | assign pick_4 = request[4] & ( lru4_5 | ~request[5]); | |
127 | assign pick_5 = request[5] & (~lru4_5 | ~request[4]); | |
128 | assign pick_6 = request[6] & ( lru6_7 | ~request[7]); | |
129 | assign pick_7 = request[7] & (~lru6_7 | ~request[6]); | |
130 | ||
131 | assign select[0] = pick_0123 & pick_01 & pick_0; | |
132 | assign select[1] = pick_0123 & pick_01 & pick_1; | |
133 | assign select[2] = pick_0123 & pick_23 & pick_2; | |
134 | assign select[3] = pick_0123 & pick_23 & pick_3; | |
135 | assign select[4] = pick_4567 & pick_45 & pick_4; | |
136 | assign select[5] = pick_4567 & pick_45 & pick_5; | |
137 | assign select[6] = pick_4567 & pick_67 & pick_6; | |
138 | assign select[7] = pick_4567 & pick_67 & pick_7; | |
139 | ||
140 | assign nlru0_1 = enable[1] | (~enable[0] & lru0_1); | |
141 | assign nlru2_3 = enable[3] | (~enable[2] & lru2_3); | |
142 | assign nlru4_5 = enable[5] | (~enable[4] & lru4_5); | |
143 | assign nlru6_7 = enable[7] | (~enable[6] & lru6_7); | |
144 | assign nlru0_3 = (enable[2] | enable[3]) | (~(enable[0] | enable[1]) & lru0_3); | |
145 | assign nlru4_7 = (enable[6] | enable[7]) | (~(enable[4] | enable[5]) & lru4_7); | |
146 | assign nlru0_7 = (enable[4] | enable[5] | enable[6] | enable[7]) | | |
147 | (~(enable[0] | enable[1] | enable[2] | enable[3]) & | |
148 | lru0_7); | |
149 | ||
150 | ||
151 | supply0 vss; | |
152 | supply1 vdd; | |
153 | // fixscan start: | |
154 | assign dff_lru_scanin = scan_in ; | |
155 | assign scan_out = dff_lru_scanout ; | |
156 | // fixscan end: | |
157 | endmodule | |
158 | ||
159 | ||
160 | ||
161 | ||
162 | ||
163 | ||
164 | // any PARAMS parms go into naming of macro | |
165 | ||
166 | module lsu_lru8_ctl_msff_ctl_macro__width_7 ( | |
167 | din, | |
168 | l1clk, | |
169 | scan_in, | |
170 | siclk, | |
171 | soclk, | |
172 | dout, | |
173 | scan_out); | |
174 | wire [6:0] fdin; | |
175 | wire [5:0] so; | |
176 | ||
177 | input [6:0] din; | |
178 | input l1clk; | |
179 | input scan_in; | |
180 | ||
181 | ||
182 | input siclk; | |
183 | input soclk; | |
184 | ||
185 | output [6:0] dout; | |
186 | output scan_out; | |
187 | assign fdin[6:0] = din[6:0]; | |
188 | ||
189 | ||
190 | ||
191 | ||
192 | ||
193 | ||
194 | dff #(7) d0_0 ( | |
195 | .l1clk(l1clk), | |
196 | .siclk(siclk), | |
197 | .soclk(soclk), | |
198 | .d(fdin[6:0]), | |
199 | .si({scan_in,so[5:0]}), | |
200 | .so({so[5:0],scan_out}), | |
201 | .q(dout[6:0]) | |
202 | ); | |
203 | ||
204 | ||
205 | ||
206 | ||
207 | ||
208 | ||
209 | ||
210 | ||
211 | ||
212 | ||
213 | ||
214 | ||
215 | endmodule | |
216 | ||
217 | ||
218 | ||
219 | ||
220 | ||
221 | ||
222 | ||
223 |