| 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 | |