decoder.cc revision 10234
1/***************************************************************************** 2 * McPAT/CACTI 3 * SOFTWARE LICENSE AGREEMENT 4 * Copyright 2012 Hewlett-Packard Development Company, L.P. 5 * Copyright (c) 2010-2013 Advanced Micro Devices, Inc. 6 * All Rights Reserved 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are 10 * met: redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer; 12 * redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution; 15 * neither the name of the copyright holders nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 ***************************************************************************/ 32 33 34 35#include <cassert> 36#include <cmath> 37#include <iostream> 38 39#include "area.h" 40#include "decoder.h" 41#include "parameter.h" 42 43using namespace std; 44 45 46Decoder::Decoder( 47 int _num_dec_signals, 48 bool flag_way_select, 49 double _C_ld_dec_out, 50 double _R_wire_dec_out, 51 bool fully_assoc_, 52 bool is_dram_, 53 bool is_wl_tr_, 54 const Area & cell_) 55 : exist(false), 56 C_ld_dec_out(_C_ld_dec_out), 57 R_wire_dec_out(_R_wire_dec_out), 58 num_gates(0), num_gates_min(2), 59 delay(0), 60 //power(), 61 fully_assoc(fully_assoc_), is_dram(is_dram_), 62 is_wl_tr(is_wl_tr_), cell(cell_) { 63 64 for (int i = 0; i < MAX_NUMBER_GATES_STAGE; i++) { 65 w_dec_n[i] = 0; 66 w_dec_p[i] = 0; 67 } 68 69 /* 70 * _num_dec_signals is the number of decoded signal as output 71 * num_addr_bits_dec is the number of signal to be decoded 72 * as the decoders input. 73 */ 74 int num_addr_bits_dec = _log2(_num_dec_signals); 75 76 if (num_addr_bits_dec < 4) { 77 if (flag_way_select) { 78 exist = true; 79 num_in_signals = 2; 80 } else { 81 num_in_signals = 0; 82 } 83 } else { 84 exist = true; 85 86 if (flag_way_select) { 87 num_in_signals = 3; 88 } else { 89 num_in_signals = 2; 90 } 91 } 92 93 assert(cell.h > 0); 94 assert(cell.w > 0); 95 // the height of a row-decoder-driver cell is fixed to be 4 * cell.h; 96 //area.h = 4 * cell.h; 97 area.h = g_tp.h_dec * cell.h; 98 99 compute_widths(); 100 compute_area(); 101} 102 103 104 105void Decoder::compute_widths() { 106 double F; 107 double p_to_n_sz_ratio = pmos_to_nmos_sz_ratio(is_dram, is_wl_tr); 108 double gnand2 = (2 + p_to_n_sz_ratio) / (1 + p_to_n_sz_ratio); 109 double gnand3 = (3 + p_to_n_sz_ratio) / (1 + p_to_n_sz_ratio); 110 111 if (exist) { 112 if (num_in_signals == 2 || fully_assoc) { 113 w_dec_n[0] = 2 * g_tp.min_w_nmos_; 114 w_dec_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 115 F = gnand2; 116 } else { 117 w_dec_n[0] = 3 * g_tp.min_w_nmos_; 118 w_dec_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 119 F = gnand3; 120 } 121 122 F *= C_ld_dec_out / (gate_C(w_dec_n[0], 0, is_dram, false, is_wl_tr) + 123 gate_C(w_dec_p[0], 0, is_dram, false, is_wl_tr)); 124 num_gates = logical_effort( 125 num_gates_min, 126 num_in_signals == 2 ? gnand2 : gnand3, 127 F, 128 w_dec_n, 129 w_dec_p, 130 C_ld_dec_out, 131 p_to_n_sz_ratio, 132 is_dram, 133 is_wl_tr, 134 g_tp.max_w_nmos_dec); 135 } 136} 137 138 139 140void Decoder::compute_area() { 141 double cumulative_area = 0; 142 double cumulative_curr = 0; // cumulative leakage current 143 double cumulative_curr_Ig = 0; // cumulative leakage current 144 145 if (exist) { // First check if this decoder exists 146 if (num_in_signals == 2) { 147 cumulative_area = 148 compute_gate_area(NAND, 2, w_dec_p[0], w_dec_n[0], area.h); 149 cumulative_curr = 150 cmos_Isub_leakage(w_dec_n[0], w_dec_p[0], 2, nand, is_dram); 151 cumulative_curr_Ig = 152 cmos_Ig_leakage(w_dec_n[0], w_dec_p[0], 2, nand, is_dram); 153 } else if (num_in_signals == 3) { 154 cumulative_area = 155 compute_gate_area(NAND, 3, w_dec_p[0], w_dec_n[0], area.h); 156 cumulative_curr = 157 cmos_Isub_leakage(w_dec_n[0], w_dec_p[0], 3, nand, is_dram);; 158 cumulative_curr_Ig = 159 cmos_Ig_leakage(w_dec_n[0], w_dec_p[0], 3, nand, is_dram); 160 } 161 162 for (int i = 1; i < num_gates; i++) { 163 cumulative_area += 164 compute_gate_area(INV, 1, w_dec_p[i], w_dec_n[i], area.h); 165 cumulative_curr += 166 cmos_Isub_leakage(w_dec_n[i], w_dec_p[i], 1, inv, is_dram); 167 cumulative_curr_Ig = 168 cmos_Ig_leakage(w_dec_n[i], w_dec_p[i], 1, inv, is_dram); 169 } 170 power.readOp.leakage = cumulative_curr * g_tp.peri_global.Vdd; 171 power.readOp.gate_leakage = cumulative_curr_Ig * g_tp.peri_global.Vdd; 172 173 area.w = (cumulative_area / area.h); 174 } 175} 176 177 178 179double Decoder::compute_delays(double inrisetime) { 180 if (exist) { 181 double ret_val = 0; // outrisetime 182 int i; 183 double rd, tf, this_delay, c_load, c_intrinsic, Vpp; 184 double Vdd = g_tp.peri_global.Vdd; 185 186 if ((is_wl_tr) && (is_dram)) { 187 Vpp = g_tp.vpp; 188 } else if (is_wl_tr) { 189 Vpp = g_tp.sram_cell.Vdd; 190 } else { 191 Vpp = g_tp.peri_global.Vdd; 192 } 193 194 // first check whether a decoder is required at all 195 rd = tr_R_on(w_dec_n[0], NCH, num_in_signals, is_dram, false, is_wl_tr); 196 c_load = gate_C(w_dec_n[1] + w_dec_p[1], 0.0, is_dram, false, is_wl_tr); 197 c_intrinsic = drain_C_(w_dec_p[0], PCH, 1, 1, area.h, is_dram, false, is_wl_tr) * num_in_signals + 198 drain_C_(w_dec_n[0], NCH, num_in_signals, 1, area.h, is_dram, false, is_wl_tr); 199 tf = rd * (c_intrinsic + c_load); 200 this_delay = horowitz(inrisetime, tf, 0.5, 0.5, RISE); 201 delay += this_delay; 202 inrisetime = this_delay / (1.0 - 0.5); 203 power.readOp.dynamic += (c_load + c_intrinsic) * Vdd * Vdd; 204 205 for (i = 1; i < num_gates - 1; ++i) { 206 rd = tr_R_on(w_dec_n[i], NCH, 1, is_dram, false, is_wl_tr); 207 c_load = gate_C(w_dec_p[i+1] + w_dec_n[i+1], 0.0, is_dram, false, is_wl_tr); 208 c_intrinsic = drain_C_(w_dec_p[i], PCH, 1, 1, area.h, is_dram, false, is_wl_tr) + 209 drain_C_(w_dec_n[i], NCH, 1, 1, area.h, is_dram, false, is_wl_tr); 210 tf = rd * (c_intrinsic + c_load); 211 this_delay = horowitz(inrisetime, tf, 0.5, 0.5, RISE); 212 delay += this_delay; 213 inrisetime = this_delay / (1.0 - 0.5); 214 power.readOp.dynamic += (c_load + c_intrinsic) * Vdd * Vdd; 215 } 216 217 // add delay of final inverter that drives the wordline 218 i = num_gates - 1; 219 c_load = C_ld_dec_out; 220 rd = tr_R_on(w_dec_n[i], NCH, 1, is_dram, false, is_wl_tr); 221 c_intrinsic = drain_C_(w_dec_p[i], PCH, 1, 1, area.h, is_dram, false, is_wl_tr) + 222 drain_C_(w_dec_n[i], NCH, 1, 1, area.h, is_dram, false, is_wl_tr); 223 tf = rd * (c_intrinsic + c_load) + R_wire_dec_out * c_load / 2; 224 this_delay = horowitz(inrisetime, tf, 0.5, 0.5, RISE); 225 delay += this_delay; 226 ret_val = this_delay / (1.0 - 0.5); 227 power.readOp.dynamic += c_load * Vpp * Vpp + c_intrinsic * Vdd * Vdd; 228 229 return ret_val; 230 } else { 231 return 0.0; 232 } 233} 234 235void Decoder::leakage_feedback(double temperature) 236{ 237 double cumulative_curr = 0; // cumulative leakage current 238 double cumulative_curr_Ig = 0; // cumulative leakage current 239 240 if (exist) 241 { // First check if this decoder exists 242 if (num_in_signals == 2) 243 { 244 cumulative_curr = cmos_Isub_leakage(w_dec_n[0], w_dec_p[0], 2, nand,is_dram); 245 cumulative_curr_Ig = cmos_Ig_leakage(w_dec_n[0], w_dec_p[0], 2, nand,is_dram); 246 } 247 else if (num_in_signals == 3) 248 { 249 cumulative_curr = cmos_Isub_leakage(w_dec_n[0], w_dec_p[0], 3, nand, is_dram);; 250 cumulative_curr_Ig = cmos_Ig_leakage(w_dec_n[0], w_dec_p[0], 3, nand, is_dram); 251 } 252 253 for (int i = 1; i < num_gates; i++) 254 { 255 cumulative_curr += cmos_Isub_leakage(w_dec_n[i], w_dec_p[i], 1, inv, is_dram); 256 cumulative_curr_Ig = cmos_Ig_leakage(w_dec_n[i], w_dec_p[i], 1, inv, is_dram); 257 } 258 259 power.readOp.leakage = cumulative_curr * g_tp.peri_global.Vdd; 260 power.readOp.gate_leakage = cumulative_curr_Ig * g_tp.peri_global.Vdd; 261 } 262} 263 264PredecBlk::PredecBlk( 265 int num_dec_signals, 266 Decoder * dec_, 267 double C_wire_predec_blk_out, 268 double R_wire_predec_blk_out_, 269 int num_dec_per_predec, 270 bool is_dram, 271 bool is_blk1) 272 : dec(dec_), 273 exist(false), 274 number_input_addr_bits(0), 275 C_ld_predec_blk_out(0), 276 R_wire_predec_blk_out(0), 277 branch_effort_nand2_gate_output(1), 278 branch_effort_nand3_gate_output(1), 279 flag_two_unique_paths(false), 280 flag_L2_gate(0), 281 number_inputs_L1_gate(0), 282 number_gates_L1_nand2_path(0), 283 number_gates_L1_nand3_path(0), 284 number_gates_L2(0), 285 min_number_gates_L1(2), 286 min_number_gates_L2(2), 287 num_L1_active_nand2_path(0), 288 num_L1_active_nand3_path(0), 289 delay_nand2_path(0), 290 delay_nand3_path(0), 291 power_nand2_path(), 292 power_nand3_path(), 293 power_L2(), 294 is_dram_(is_dram) { 295 int branch_effort_predec_out; 296 double C_ld_dec_gate; 297 int num_addr_bits_dec = _log2(num_dec_signals); 298 int blk1_num_input_addr_bits = (num_addr_bits_dec + 1) / 2; 299 int blk2_num_input_addr_bits = num_addr_bits_dec - blk1_num_input_addr_bits; 300 301 w_L1_nand2_n[0] = 0; 302 w_L1_nand2_p[0] = 0; 303 w_L1_nand3_n[0] = 0; 304 w_L1_nand3_p[0] = 0; 305 306 if (is_blk1 == true) { 307 if (num_addr_bits_dec <= 0) { 308 return; 309 } else if (num_addr_bits_dec < 4) { 310 // Just one predecoder block is required with NAND2 gates. No decoder required. 311 // The first level of predecoding directly drives the decoder output load 312 exist = true; 313 number_input_addr_bits = num_addr_bits_dec; 314 R_wire_predec_blk_out = dec->R_wire_dec_out; 315 C_ld_predec_blk_out = dec->C_ld_dec_out; 316 } else { 317 exist = true; 318 number_input_addr_bits = blk1_num_input_addr_bits; 319 branch_effort_predec_out = (1 << blk2_num_input_addr_bits); 320 C_ld_dec_gate = num_dec_per_predec * gate_C(dec->w_dec_n[0] + dec->w_dec_p[0], 0, is_dram_, false, false); 321 R_wire_predec_blk_out = R_wire_predec_blk_out_; 322 C_ld_predec_blk_out = branch_effort_predec_out * C_ld_dec_gate + C_wire_predec_blk_out; 323 } 324 } else { 325 if (num_addr_bits_dec >= 4) { 326 exist = true; 327 number_input_addr_bits = blk2_num_input_addr_bits; 328 branch_effort_predec_out = (1 << blk1_num_input_addr_bits); 329 C_ld_dec_gate = num_dec_per_predec * gate_C(dec->w_dec_n[0] + dec->w_dec_p[0], 0, is_dram_, false, false); 330 R_wire_predec_blk_out = R_wire_predec_blk_out_; 331 C_ld_predec_blk_out = branch_effort_predec_out * C_ld_dec_gate + C_wire_predec_blk_out; 332 } 333 } 334 335 compute_widths(); 336 compute_area(); 337} 338 339 340 341void PredecBlk::compute_widths() { 342 double F, c_load_nand3_path, c_load_nand2_path; 343 double p_to_n_sz_ratio = pmos_to_nmos_sz_ratio(is_dram_); 344 double gnand2 = (2 + p_to_n_sz_ratio) / (1 + p_to_n_sz_ratio); 345 double gnand3 = (3 + p_to_n_sz_ratio) / (1 + p_to_n_sz_ratio); 346 347 if (exist == false) return; 348 349 350 switch (number_input_addr_bits) { 351 case 1: 352 flag_two_unique_paths = false; 353 number_inputs_L1_gate = 2; 354 flag_L2_gate = 0; 355 break; 356 case 2: 357 flag_two_unique_paths = false; 358 number_inputs_L1_gate = 2; 359 flag_L2_gate = 0; 360 break; 361 case 3: 362 flag_two_unique_paths = false; 363 number_inputs_L1_gate = 3; 364 flag_L2_gate = 0; 365 break; 366 case 4: 367 flag_two_unique_paths = false; 368 number_inputs_L1_gate = 2; 369 flag_L2_gate = 2; 370 branch_effort_nand2_gate_output = 4; 371 break; 372 case 5: 373 flag_two_unique_paths = true; 374 flag_L2_gate = 2; 375 branch_effort_nand2_gate_output = 8; 376 branch_effort_nand3_gate_output = 4; 377 break; 378 case 6: 379 flag_two_unique_paths = false; 380 number_inputs_L1_gate = 3; 381 flag_L2_gate = 2; 382 branch_effort_nand3_gate_output = 8; 383 break; 384 case 7: 385 flag_two_unique_paths = true; 386 flag_L2_gate = 3; 387 branch_effort_nand2_gate_output = 32; 388 branch_effort_nand3_gate_output = 16; 389 break; 390 case 8: 391 flag_two_unique_paths = true; 392 flag_L2_gate = 3; 393 branch_effort_nand2_gate_output = 64; 394 branch_effort_nand3_gate_output = 32; 395 break; 396 case 9: 397 flag_two_unique_paths = false; 398 number_inputs_L1_gate = 3; 399 flag_L2_gate = 3; 400 branch_effort_nand3_gate_output = 64; 401 break; 402 default: 403 assert(0); 404 break; 405 } 406 407 // find the number of gates and sizing in second level of predecoder (if there is a second level) 408 if (flag_L2_gate) { 409 if (flag_L2_gate == 2) { // 2nd level is a NAND2 gate 410 w_L2_n[0] = 2 * g_tp.min_w_nmos_; 411 F = gnand2; 412 } else { // 2nd level is a NAND3 gate 413 w_L2_n[0] = 3 * g_tp.min_w_nmos_; 414 F = gnand3; 415 } 416 w_L2_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 417 F *= C_ld_predec_blk_out / (gate_C(w_L2_n[0], 0, is_dram_) + gate_C(w_L2_p[0], 0, is_dram_)); 418 number_gates_L2 = logical_effort( 419 min_number_gates_L2, 420 flag_L2_gate == 2 ? gnand2 : gnand3, 421 F, 422 w_L2_n, 423 w_L2_p, 424 C_ld_predec_blk_out, 425 p_to_n_sz_ratio, 426 is_dram_, false, 427 g_tp.max_w_nmos_); 428 429 // Now find the number of gates and widths in first level of predecoder 430 if ((flag_two_unique_paths) || (number_inputs_L1_gate == 2)) { 431 // Whenever flag_two_unique_paths is true, it means first level of 432 // decoder employs 433 // both NAND2 and NAND3 gates. Or when number_inputs_L1_gate is 2, 434 // it means 435 // a NAND2 gate is used in the first level of the predecoder 436 c_load_nand2_path = branch_effort_nand2_gate_output * 437 (gate_C(w_L2_n[0], 0, is_dram_) + 438 gate_C(w_L2_p[0], 0, is_dram_)); 439 w_L1_nand2_n[0] = 2 * g_tp.min_w_nmos_; 440 w_L1_nand2_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 441 F = gnand2 * c_load_nand2_path / 442 (gate_C(w_L1_nand2_n[0], 0, is_dram_) + 443 gate_C(w_L1_nand2_p[0], 0, is_dram_)); 444 number_gates_L1_nand2_path = logical_effort( 445 min_number_gates_L1, 446 gnand2, 447 F, 448 w_L1_nand2_n, 449 w_L1_nand2_p, 450 c_load_nand2_path, 451 p_to_n_sz_ratio, 452 is_dram_, false, 453 g_tp.max_w_nmos_); 454 } 455 456 //Now find widths of gates along path in which first gate is a NAND3 457 if ((flag_two_unique_paths) || (number_inputs_L1_gate == 3)) { // Whenever flag_two_unique_paths is TRUE, it means first level of decoder employs 458 // both NAND2 and NAND3 gates. Or when number_inputs_L1_gate is 3, it means 459 // a NAND3 gate is used in the first level of the predecoder 460 c_load_nand3_path = branch_effort_nand3_gate_output * 461 (gate_C(w_L2_n[0], 0, is_dram_) + 462 gate_C(w_L2_p[0], 0, is_dram_)); 463 w_L1_nand3_n[0] = 3 * g_tp.min_w_nmos_; 464 w_L1_nand3_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 465 F = gnand3 * c_load_nand3_path / 466 (gate_C(w_L1_nand3_n[0], 0, is_dram_) + 467 gate_C(w_L1_nand3_p[0], 0, is_dram_)); 468 number_gates_L1_nand3_path = logical_effort( 469 min_number_gates_L1, 470 gnand3, 471 F, 472 w_L1_nand3_n, 473 w_L1_nand3_p, 474 c_load_nand3_path, 475 p_to_n_sz_ratio, 476 is_dram_, false, 477 g_tp.max_w_nmos_); 478 } 479 } else { // find number of gates and widths in first level of predecoder block when there is no second level 480 if (number_inputs_L1_gate == 2) { 481 w_L1_nand2_n[0] = 2 * g_tp.min_w_nmos_; 482 w_L1_nand2_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 483 F = gnand2 * C_ld_predec_blk_out / 484 (gate_C(w_L1_nand2_n[0], 0, is_dram_) + 485 gate_C(w_L1_nand2_p[0], 0, is_dram_)); 486 number_gates_L1_nand2_path = logical_effort( 487 min_number_gates_L1, 488 gnand2, 489 F, 490 w_L1_nand2_n, 491 w_L1_nand2_p, 492 C_ld_predec_blk_out, 493 p_to_n_sz_ratio, 494 is_dram_, false, 495 g_tp.max_w_nmos_); 496 } else if (number_inputs_L1_gate == 3) { 497 w_L1_nand3_n[0] = 3 * g_tp.min_w_nmos_; 498 w_L1_nand3_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 499 F = gnand3 * C_ld_predec_blk_out / 500 (gate_C(w_L1_nand3_n[0], 0, is_dram_) + 501 gate_C(w_L1_nand3_p[0], 0, is_dram_)); 502 number_gates_L1_nand3_path = logical_effort( 503 min_number_gates_L1, 504 gnand3, 505 F, 506 w_L1_nand3_n, 507 w_L1_nand3_p, 508 C_ld_predec_blk_out, 509 p_to_n_sz_ratio, 510 is_dram_, false, 511 g_tp.max_w_nmos_); 512 } 513 } 514} 515 516 517 518void PredecBlk::compute_area() { 519 if (exist) { // First check whether a predecoder block is needed 520 int num_L1_nand2 = 0; 521 int num_L1_nand3 = 0; 522 int num_L2 = 0; 523 double tot_area_L1_nand3 = 0; 524 double leak_L1_nand3 = 0; 525 double gate_leak_L1_nand3 = 0; 526 527 double tot_area_L1_nand2 = compute_gate_area(NAND, 2, w_L1_nand2_p[0], w_L1_nand2_n[0], g_tp.cell_h_def); 528 double leak_L1_nand2 = cmos_Isub_leakage(w_L1_nand2_n[0], w_L1_nand2_p[0], 2, nand, is_dram_); 529 double gate_leak_L1_nand2 = cmos_Ig_leakage(w_L1_nand2_n[0], w_L1_nand2_p[0], 2, nand, is_dram_); 530 if (number_inputs_L1_gate != 3) { 531 tot_area_L1_nand3 = 0; 532 leak_L1_nand3 = 0; 533 gate_leak_L1_nand3 = 0; 534 } else { 535 tot_area_L1_nand3 = compute_gate_area(NAND, 3, w_L1_nand3_p[0], w_L1_nand3_n[0], g_tp.cell_h_def); 536 leak_L1_nand3 = cmos_Isub_leakage(w_L1_nand3_n[0], w_L1_nand3_p[0], 3, nand); 537 gate_leak_L1_nand3 = cmos_Ig_leakage(w_L1_nand3_n[0], w_L1_nand3_p[0], 3, nand); 538 } 539 540 switch (number_input_addr_bits) { 541 case 1: //2 NAND2 gates 542 num_L1_nand2 = 2; 543 num_L2 = 0; 544 num_L1_active_nand2_path = 1; 545 num_L1_active_nand3_path = 0; 546 break; 547 case 2: //4 NAND2 gates 548 num_L1_nand2 = 4; 549 num_L2 = 0; 550 num_L1_active_nand2_path = 1; 551 num_L1_active_nand3_path = 0; 552 break; 553 case 3: //8 NAND3 gates 554 num_L1_nand3 = 8; 555 num_L2 = 0; 556 num_L1_active_nand2_path = 0; 557 num_L1_active_nand3_path = 1; 558 break; 559 case 4: //4 + 4 NAND2 gates 560 num_L1_nand2 = 8; 561 num_L2 = 16; 562 num_L1_active_nand2_path = 2; 563 num_L1_active_nand3_path = 0; 564 break; 565 case 5: //4 NAND2 gates, 8 NAND3 gates 566 num_L1_nand2 = 4; 567 num_L1_nand3 = 8; 568 num_L2 = 32; 569 num_L1_active_nand2_path = 1; 570 num_L1_active_nand3_path = 1; 571 break; 572 case 6: //8 + 8 NAND3 gates 573 num_L1_nand3 = 16; 574 num_L2 = 64; 575 num_L1_active_nand2_path = 0; 576 num_L1_active_nand3_path = 2; 577 break; 578 case 7: //4 + 4 NAND2 gates, 8 NAND3 gates 579 num_L1_nand2 = 8; 580 num_L1_nand3 = 8; 581 num_L2 = 128; 582 num_L1_active_nand2_path = 2; 583 num_L1_active_nand3_path = 1; 584 break; 585 case 8: //4 NAND2 gates, 8 + 8 NAND3 gates 586 num_L1_nand2 = 4; 587 num_L1_nand3 = 16; 588 num_L2 = 256; 589 num_L1_active_nand2_path = 2; 590 num_L1_active_nand3_path = 2; 591 break; 592 case 9: //8 + 8 + 8 NAND3 gates 593 num_L1_nand3 = 24; 594 num_L2 = 512; 595 num_L1_active_nand2_path = 0; 596 num_L1_active_nand3_path = 3; 597 break; 598 default: 599 break; 600 } 601 602 for (int i = 1; i < number_gates_L1_nand2_path; ++i) { 603 tot_area_L1_nand2 += compute_gate_area(INV, 1, w_L1_nand2_p[i], w_L1_nand2_n[i], g_tp.cell_h_def); 604 leak_L1_nand2 += cmos_Isub_leakage(w_L1_nand2_n[i], w_L1_nand2_p[i], 2, nand, is_dram_); 605 gate_leak_L1_nand2 += cmos_Ig_leakage(w_L1_nand2_n[i], w_L1_nand2_p[i], 2, nand, is_dram_); 606 } 607 tot_area_L1_nand2 *= num_L1_nand2; 608 leak_L1_nand2 *= num_L1_nand2; 609 gate_leak_L1_nand2 *= num_L1_nand2; 610 611 for (int i = 1; i < number_gates_L1_nand3_path; ++i) { 612 tot_area_L1_nand3 += compute_gate_area(INV, 1, w_L1_nand3_p[i], w_L1_nand3_n[i], g_tp.cell_h_def); 613 leak_L1_nand3 += cmos_Isub_leakage(w_L1_nand3_n[i], w_L1_nand3_p[i], 3, nand, is_dram_); 614 gate_leak_L1_nand3 += cmos_Ig_leakage(w_L1_nand3_n[i], w_L1_nand3_p[i], 3, nand, is_dram_); 615 } 616 tot_area_L1_nand3 *= num_L1_nand3; 617 leak_L1_nand3 *= num_L1_nand3; 618 gate_leak_L1_nand3 *= num_L1_nand3; 619 620 double cumulative_area_L1 = tot_area_L1_nand2 + tot_area_L1_nand3; 621 double cumulative_area_L2 = 0.0; 622 double leakage_L2 = 0.0; 623 double gate_leakage_L2 = 0.0; 624 625 if (flag_L2_gate == 2) { 626 cumulative_area_L2 = compute_gate_area(NAND, 2, w_L2_p[0], w_L2_n[0], g_tp.cell_h_def); 627 leakage_L2 = cmos_Isub_leakage(w_L2_n[0], w_L2_p[0], 2, nand, is_dram_); 628 gate_leakage_L2 = cmos_Ig_leakage(w_L2_n[0], w_L2_p[0], 2, nand, is_dram_); 629 } else if (flag_L2_gate == 3) { 630 cumulative_area_L2 = compute_gate_area(NAND, 3, w_L2_p[0], w_L2_n[0], g_tp.cell_h_def); 631 leakage_L2 = cmos_Isub_leakage(w_L2_n[0], w_L2_p[0], 3, nand, is_dram_); 632 gate_leakage_L2 = cmos_Ig_leakage(w_L2_n[0], w_L2_p[0], 3, nand, is_dram_); 633 } 634 635 for (int i = 1; i < number_gates_L2; ++i) { 636 cumulative_area_L2 += compute_gate_area(INV, 1, w_L2_p[i], w_L2_n[i], g_tp.cell_h_def); 637 leakage_L2 += cmos_Isub_leakage(w_L2_n[i], w_L2_p[i], 2, inv, is_dram_); 638 gate_leakage_L2 += cmos_Ig_leakage(w_L2_n[i], w_L2_p[i], 2, inv, is_dram_); 639 } 640 cumulative_area_L2 *= num_L2; 641 leakage_L2 *= num_L2; 642 gate_leakage_L2 *= num_L2; 643 644 power_nand2_path.readOp.leakage = leak_L1_nand2 * g_tp.peri_global.Vdd; 645 power_nand3_path.readOp.leakage = leak_L1_nand3 * g_tp.peri_global.Vdd; 646 power_L2.readOp.leakage = leakage_L2 * g_tp.peri_global.Vdd; 647 area.set_area(cumulative_area_L1 + cumulative_area_L2); 648 power_nand2_path.readOp.gate_leakage = gate_leak_L1_nand2 * g_tp.peri_global.Vdd; 649 power_nand3_path.readOp.gate_leakage = gate_leak_L1_nand3 * g_tp.peri_global.Vdd; 650 power_L2.readOp.gate_leakage = gate_leakage_L2 * g_tp.peri_global.Vdd; 651 } 652} 653 654 655 656pair<double, double> PredecBlk::compute_delays( 657 pair<double, double> inrisetime) { // <nand2, nand3> 658 pair<double, double> ret_val; 659 ret_val.first = 0; // outrisetime_nand2_path 660 ret_val.second = 0; // outrisetime_nand3_path 661 662 double inrisetime_nand2_path = inrisetime.first; 663 double inrisetime_nand3_path = inrisetime.second; 664 int i; 665 double rd, c_load, c_intrinsic, tf, this_delay; 666 double Vdd = g_tp.peri_global.Vdd; 667 668 // TODO: following delay calculation part can be greatly simplified. 669 // first check whether a predecoder block is required 670 if (exist) { 671 //Find delay in first level of predecoder block 672 //First find delay in path 673 if ((flag_two_unique_paths) || (number_inputs_L1_gate == 2)) { 674 //First gate is a NAND2 gate 675 rd = tr_R_on(w_L1_nand2_n[0], NCH, 2, is_dram_); 676 c_load = gate_C(w_L1_nand2_n[1] + w_L1_nand2_p[1], 0.0, is_dram_); 677 c_intrinsic = 2 * drain_C_(w_L1_nand2_p[0], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 678 drain_C_(w_L1_nand2_n[0], NCH, 2, 1, g_tp.cell_h_def, is_dram_); 679 tf = rd * (c_intrinsic + c_load); 680 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 681 delay_nand2_path += this_delay; 682 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 683 power_nand2_path.readOp.dynamic += (c_load + c_intrinsic) * Vdd * Vdd; 684 685 //Add delays of all but the last inverter in the chain 686 for (i = 1; i < number_gates_L1_nand2_path - 1; ++i) { 687 rd = tr_R_on(w_L1_nand2_n[i], NCH, 1, is_dram_); 688 c_load = gate_C(w_L1_nand2_n[i+1] + w_L1_nand2_p[i+1], 0.0, is_dram_); 689 c_intrinsic = drain_C_(w_L1_nand2_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 690 drain_C_(w_L1_nand2_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 691 tf = rd * (c_intrinsic + c_load); 692 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 693 delay_nand2_path += this_delay; 694 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 695 power_nand2_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 696 } 697 698 //Add delay of the last inverter 699 i = number_gates_L1_nand2_path - 1; 700 rd = tr_R_on(w_L1_nand2_n[i], NCH, 1, is_dram_); 701 if (flag_L2_gate) { 702 c_load = branch_effort_nand2_gate_output * 703 (gate_C(w_L2_n[0], 0, is_dram_) + 704 gate_C(w_L2_p[0], 0, is_dram_)); 705 c_intrinsic = drain_C_(w_L1_nand2_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 706 drain_C_(w_L1_nand2_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 707 tf = rd * (c_intrinsic + c_load); 708 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 709 delay_nand2_path += this_delay; 710 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 711 power_nand2_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 712 } else { //First level directly drives decoder output load 713 c_load = C_ld_predec_blk_out; 714 c_intrinsic = drain_C_(w_L1_nand2_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 715 drain_C_(w_L1_nand2_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 716 tf = rd * (c_intrinsic + c_load) + R_wire_predec_blk_out * c_load / 2; 717 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 718 delay_nand2_path += this_delay; 719 ret_val.first = this_delay / (1.0 - 0.5); 720 power_nand2_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 721 } 722 } 723 724 if ((flag_two_unique_paths) || (number_inputs_L1_gate == 3)) { 725 //Check if the number of gates in the first level is more than 1. 726 //First gate is a NAND3 gate 727 rd = tr_R_on(w_L1_nand3_n[0], NCH, 3, is_dram_); 728 c_load = gate_C(w_L1_nand3_n[1] + w_L1_nand3_p[1], 0.0, is_dram_); 729 c_intrinsic = 3 * drain_C_(w_L1_nand3_p[0], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 730 drain_C_(w_L1_nand3_n[0], NCH, 3, 1, g_tp.cell_h_def, is_dram_); 731 tf = rd * (c_intrinsic + c_load); 732 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 733 delay_nand3_path += this_delay; 734 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 735 power_nand3_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 736 737 //Add delays of all but the last inverter in the chain 738 for (i = 1; i < number_gates_L1_nand3_path - 1; ++i) { 739 rd = tr_R_on(w_L1_nand3_n[i], NCH, 1, is_dram_); 740 c_load = gate_C(w_L1_nand3_n[i+1] + w_L1_nand3_p[i+1], 0.0, is_dram_); 741 c_intrinsic = drain_C_(w_L1_nand3_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 742 drain_C_(w_L1_nand3_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 743 tf = rd * (c_intrinsic + c_load); 744 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 745 delay_nand3_path += this_delay; 746 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 747 power_nand3_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 748 } 749 750 //Add delay of the last inverter 751 i = number_gates_L1_nand3_path - 1; 752 rd = tr_R_on(w_L1_nand3_n[i], NCH, 1, is_dram_); 753 if (flag_L2_gate) { 754 c_load = branch_effort_nand3_gate_output * 755 (gate_C(w_L2_n[0], 0, is_dram_) + gate_C(w_L2_p[0], 0, 756 is_dram_)); 757 c_intrinsic = drain_C_(w_L1_nand3_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 758 drain_C_(w_L1_nand3_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 759 tf = rd * (c_intrinsic + c_load); 760 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 761 delay_nand3_path += this_delay; 762 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 763 power_nand3_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 764 } else { //First level directly drives decoder output load 765 c_load = C_ld_predec_blk_out; 766 c_intrinsic = drain_C_(w_L1_nand3_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 767 drain_C_(w_L1_nand3_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 768 tf = rd * (c_intrinsic + c_load) + R_wire_predec_blk_out * c_load / 2; 769 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 770 delay_nand3_path += this_delay; 771 ret_val.second = this_delay / (1.0 - 0.5); 772 power_nand3_path.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 773 } 774 } 775 776 // Find delay through second level 777 if (flag_L2_gate) { 778 if (flag_L2_gate == 2) { 779 rd = tr_R_on(w_L2_n[0], NCH, 2, is_dram_); 780 c_load = gate_C(w_L2_n[1] + w_L2_p[1], 0.0, is_dram_); 781 c_intrinsic = 2 * drain_C_(w_L2_p[0], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 782 drain_C_(w_L2_n[0], NCH, 2, 1, g_tp.cell_h_def, is_dram_); 783 tf = rd * (c_intrinsic + c_load); 784 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 785 delay_nand2_path += this_delay; 786 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 787 power_L2.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 788 } else { // flag_L2_gate = 3 789 rd = tr_R_on(w_L2_n[0], NCH, 3, is_dram_); 790 c_load = gate_C(w_L2_n[1] + w_L2_p[1], 0.0, is_dram_); 791 c_intrinsic = 3 * drain_C_(w_L2_p[0], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 792 drain_C_(w_L2_n[0], NCH, 3, 1, g_tp.cell_h_def, is_dram_); 793 tf = rd * (c_intrinsic + c_load); 794 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 795 delay_nand3_path += this_delay; 796 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 797 power_L2.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 798 } 799 800 for (i = 1; i < number_gates_L2 - 1; ++i) { 801 rd = tr_R_on(w_L2_n[i], NCH, 1, is_dram_); 802 c_load = gate_C(w_L2_n[i+1] + w_L2_p[i+1], 0.0, is_dram_); 803 c_intrinsic = drain_C_(w_L2_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 804 drain_C_(w_L2_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 805 tf = rd * (c_intrinsic + c_load); 806 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 807 delay_nand2_path += this_delay; 808 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 809 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 810 delay_nand3_path += this_delay; 811 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 812 power_L2.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 813 } 814 815 //Add delay of final inverter that drives the wordline decoders 816 i = number_gates_L2 - 1; 817 c_load = C_ld_predec_blk_out; 818 rd = tr_R_on(w_L2_n[i], NCH, 1, is_dram_); 819 c_intrinsic = drain_C_(w_L2_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 820 drain_C_(w_L2_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 821 tf = rd * (c_intrinsic + c_load) + R_wire_predec_blk_out * c_load / 2; 822 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 823 delay_nand2_path += this_delay; 824 ret_val.first = this_delay / (1.0 - 0.5); 825 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 826 delay_nand3_path += this_delay; 827 ret_val.second = this_delay / (1.0 - 0.5); 828 power_L2.readOp.dynamic += (c_intrinsic + c_load) * Vdd * Vdd; 829 } 830 } 831 832 delay = (ret_val.first > ret_val.second) ? ret_val.first : ret_val.second; 833 return ret_val; 834} 835 836void PredecBlk::leakage_feedback(double temperature) 837{ 838 if (exist) 839 { // First check whether a predecoder block is needed 840 int num_L1_nand2 = 0; 841 int num_L1_nand3 = 0; 842 int num_L2 = 0; 843 double leak_L1_nand3 =0; 844 double gate_leak_L1_nand3 =0; 845 846 double leak_L1_nand2 = cmos_Isub_leakage(w_L1_nand2_n[0], w_L1_nand2_p[0], 2, nand, is_dram_); 847 double gate_leak_L1_nand2 = cmos_Ig_leakage(w_L1_nand2_n[0], w_L1_nand2_p[0], 2, nand, is_dram_); 848 if (number_inputs_L1_gate != 3) { 849 leak_L1_nand3 = 0; 850 gate_leak_L1_nand3 =0; 851 } 852 else { 853 leak_L1_nand3 = cmos_Isub_leakage(w_L1_nand3_n[0], w_L1_nand3_p[0], 3, nand); 854 gate_leak_L1_nand3 = cmos_Ig_leakage(w_L1_nand3_n[0], w_L1_nand3_p[0], 3, nand); 855 } 856 857 switch (number_input_addr_bits) 858 { 859 case 1: //2 NAND2 gates 860 num_L1_nand2 = 2; 861 num_L2 = 0; 862 num_L1_active_nand2_path =1; 863 num_L1_active_nand3_path =0; 864 break; 865 case 2: //4 NAND2 gates 866 num_L1_nand2 = 4; 867 num_L2 = 0; 868 num_L1_active_nand2_path =1; 869 num_L1_active_nand3_path =0; 870 break; 871 case 3: //8 NAND3 gates 872 num_L1_nand3 = 8; 873 num_L2 = 0; 874 num_L1_active_nand2_path =0; 875 num_L1_active_nand3_path =1; 876 break; 877 case 4: //4 + 4 NAND2 gates 878 num_L1_nand2 = 8; 879 num_L2 = 16; 880 num_L1_active_nand2_path =2; 881 num_L1_active_nand3_path =0; 882 break; 883 case 5: //4 NAND2 gates, 8 NAND3 gates 884 num_L1_nand2 = 4; 885 num_L1_nand3 = 8; 886 num_L2 = 32; 887 num_L1_active_nand2_path =1; 888 num_L1_active_nand3_path =1; 889 break; 890 case 6: //8 + 8 NAND3 gates 891 num_L1_nand3 = 16; 892 num_L2 = 64; 893 num_L1_active_nand2_path =0; 894 num_L1_active_nand3_path =2; 895 break; 896 case 7: //4 + 4 NAND2 gates, 8 NAND3 gates 897 num_L1_nand2 = 8; 898 num_L1_nand3 = 8; 899 num_L2 = 128; 900 num_L1_active_nand2_path =2; 901 num_L1_active_nand3_path =1; 902 break; 903 case 8: //4 NAND2 gates, 8 + 8 NAND3 gates 904 num_L1_nand2 = 4; 905 num_L1_nand3 = 16; 906 num_L2 = 256; 907 num_L1_active_nand2_path =2; 908 num_L1_active_nand3_path =2; 909 break; 910 case 9: //8 + 8 + 8 NAND3 gates 911 num_L1_nand3 = 24; 912 num_L2 = 512; 913 num_L1_active_nand2_path =0; 914 num_L1_active_nand3_path =3; 915 break; 916 default: 917 break; 918 } 919 920 for (int i = 1; i < number_gates_L1_nand2_path; ++i) 921 { 922 leak_L1_nand2 += cmos_Isub_leakage(w_L1_nand2_n[i], w_L1_nand2_p[i], 2, nand, is_dram_); 923 gate_leak_L1_nand2 += cmos_Ig_leakage(w_L1_nand2_n[i], w_L1_nand2_p[i], 2, nand, is_dram_); 924 } 925 leak_L1_nand2 *= num_L1_nand2; 926 gate_leak_L1_nand2 *= num_L1_nand2; 927 928 for (int i = 1; i < number_gates_L1_nand3_path; ++i) 929 { 930 leak_L1_nand3 += cmos_Isub_leakage(w_L1_nand3_n[i], w_L1_nand3_p[i], 3, nand, is_dram_); 931 gate_leak_L1_nand3 += cmos_Ig_leakage(w_L1_nand3_n[i], w_L1_nand3_p[i], 3, nand, is_dram_); 932 } 933 leak_L1_nand3 *= num_L1_nand3; 934 gate_leak_L1_nand3 *= num_L1_nand3; 935 936 double leakage_L2 = 0.0; 937 double gate_leakage_L2 = 0.0; 938 939 if (flag_L2_gate == 2) 940 { 941 leakage_L2 = cmos_Isub_leakage(w_L2_n[0], w_L2_p[0], 2, nand, is_dram_); 942 gate_leakage_L2 = cmos_Ig_leakage(w_L2_n[0], w_L2_p[0], 2, nand, is_dram_); 943 } 944 else if (flag_L2_gate == 3) 945 { 946 leakage_L2 = cmos_Isub_leakage(w_L2_n[0], w_L2_p[0], 3, nand, is_dram_); 947 gate_leakage_L2 = cmos_Ig_leakage(w_L2_n[0], w_L2_p[0], 3, nand, is_dram_); 948 } 949 950 for (int i = 1; i < number_gates_L2; ++i) 951 { 952 leakage_L2 += cmos_Isub_leakage(w_L2_n[i], w_L2_p[i], 2, inv, is_dram_); 953 gate_leakage_L2 += cmos_Ig_leakage(w_L2_n[i], w_L2_p[i], 2, inv, is_dram_); 954 } 955 leakage_L2 *= num_L2; 956 gate_leakage_L2 *= num_L2; 957 958 power_nand2_path.readOp.leakage = leak_L1_nand2 * g_tp.peri_global.Vdd; 959 power_nand3_path.readOp.leakage = leak_L1_nand3 * g_tp.peri_global.Vdd; 960 power_L2.readOp.leakage = leakage_L2 * g_tp.peri_global.Vdd; 961 962 power_nand2_path.readOp.gate_leakage = gate_leak_L1_nand2 * g_tp.peri_global.Vdd; 963 power_nand3_path.readOp.gate_leakage = gate_leak_L1_nand3 * g_tp.peri_global.Vdd; 964 power_L2.readOp.gate_leakage = gate_leakage_L2 * g_tp.peri_global.Vdd; 965 } 966} 967 968PredecBlkDrv::PredecBlkDrv( 969 int way_select_, 970 PredecBlk * blk_, 971 bool is_dram) 972 : flag_driver_exists(0), 973 number_gates_nand2_path(0), 974 number_gates_nand3_path(0), 975 min_number_gates(2), 976 num_buffers_driving_1_nand2_load(0), 977 num_buffers_driving_2_nand2_load(0), 978 num_buffers_driving_4_nand2_load(0), 979 num_buffers_driving_2_nand3_load(0), 980 num_buffers_driving_8_nand3_load(0), 981 num_buffers_nand3_path(0), 982 c_load_nand2_path_out(0), 983 c_load_nand3_path_out(0), 984 r_load_nand2_path_out(0), 985 r_load_nand3_path_out(0), 986 delay_nand2_path(0), 987 delay_nand3_path(0), 988 power_nand2_path(), 989 power_nand3_path(), 990 blk(blk_), dec(blk->dec), 991 is_dram_(is_dram), 992 way_select(way_select_) { 993 for (int i = 0; i < MAX_NUMBER_GATES_STAGE; i++) { 994 width_nand2_path_n[i] = 0; 995 width_nand2_path_p[i] = 0; 996 width_nand3_path_n[i] = 0; 997 width_nand3_path_p[i] = 0; 998 } 999 1000 number_input_addr_bits = blk->number_input_addr_bits; 1001 1002 if (way_select > 1) { 1003 flag_driver_exists = 1; 1004 number_input_addr_bits = way_select; 1005 if (dec->num_in_signals == 2) { 1006 c_load_nand2_path_out = gate_C(dec->w_dec_n[0] + dec->w_dec_p[0], 0, is_dram_); 1007 num_buffers_driving_2_nand2_load = number_input_addr_bits; 1008 } else if (dec->num_in_signals == 3) { 1009 c_load_nand3_path_out = gate_C(dec->w_dec_n[0] + dec->w_dec_p[0], 0, is_dram_); 1010 num_buffers_driving_2_nand3_load = number_input_addr_bits; 1011 } 1012 } else if (way_select == 0) { 1013 if (blk->exist) { 1014 flag_driver_exists = 1; 1015 } 1016 } 1017 1018 compute_widths(); 1019 compute_area(); 1020} 1021 1022 1023 1024void PredecBlkDrv::compute_widths() { 1025 // The predecode block driver accepts as input the address bits from the h-tree network. For 1026 // each addr bit it then generates addr and addrbar as outputs. For now ignore the effect of 1027 // inversion to generate addrbar and simply treat addrbar as addr. 1028 1029 double F; 1030 double p_to_n_sz_ratio = pmos_to_nmos_sz_ratio(is_dram_); 1031 1032 if (flag_driver_exists) { 1033 double C_nand2_gate_blk = gate_C(blk->w_L1_nand2_n[0] + blk->w_L1_nand2_p[0], 0, is_dram_); 1034 double C_nand3_gate_blk = gate_C(blk->w_L1_nand3_n[0] + blk->w_L1_nand3_p[0], 0, is_dram_); 1035 1036 if (way_select == 0) { 1037 if (blk->number_input_addr_bits == 1) { 1038 //2 NAND2 gates 1039 num_buffers_driving_2_nand2_load = 1; 1040 c_load_nand2_path_out = 2 * C_nand2_gate_blk; 1041 } else if (blk->number_input_addr_bits == 2) { 1042 //4 NAND2 gates one 2-4 decoder 1043 num_buffers_driving_4_nand2_load = 2; 1044 c_load_nand2_path_out = 4 * C_nand2_gate_blk; 1045 } else if (blk->number_input_addr_bits == 3) { 1046 //8 NAND3 gates one 3-8 decoder 1047 num_buffers_driving_8_nand3_load = 3; 1048 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1049 } else if (blk->number_input_addr_bits == 4) { 1050 //4 + 4 NAND2 gates two 2-4 decoder 1051 num_buffers_driving_4_nand2_load = 4; 1052 c_load_nand2_path_out = 4 * C_nand2_gate_blk; 1053 } else if (blk->number_input_addr_bits == 5) { 1054 //4 NAND2 gates, 8 NAND3 gates one 2-4 decoder and one 3-8 1055 //decoder 1056 num_buffers_driving_4_nand2_load = 2; 1057 num_buffers_driving_8_nand3_load = 3; 1058 c_load_nand2_path_out = 4 * C_nand2_gate_blk; 1059 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1060 } else if (blk->number_input_addr_bits == 6) { 1061 //8 + 8 NAND3 gates two 3-8 decoder 1062 num_buffers_driving_8_nand3_load = 6; 1063 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1064 } else if (blk->number_input_addr_bits == 7) { 1065 //4 + 4 NAND2 gates, 8 NAND3 gates two 2-4 decoder and one 3-8 1066 //decoder 1067 num_buffers_driving_4_nand2_load = 4; 1068 num_buffers_driving_8_nand3_load = 3; 1069 c_load_nand2_path_out = 4 * C_nand2_gate_blk; 1070 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1071 } else if (blk->number_input_addr_bits == 8) { 1072 //4 NAND2 gates, 8 + 8 NAND3 gates one 2-4 decoder and two 3-8 1073 //decoder 1074 num_buffers_driving_4_nand2_load = 2; 1075 num_buffers_driving_8_nand3_load = 6; 1076 c_load_nand2_path_out = 4 * C_nand2_gate_blk; 1077 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1078 } else if (blk->number_input_addr_bits == 9) { 1079 //8 + 8 + 8 NAND3 gates three 3-8 decoder 1080 num_buffers_driving_8_nand3_load = 9; 1081 c_load_nand3_path_out = 8 * C_nand3_gate_blk; 1082 } 1083 } 1084 1085 if ((blk->flag_two_unique_paths) || 1086 (blk->number_inputs_L1_gate == 2) || 1087 (number_input_addr_bits == 0) || 1088 ((way_select) && (dec->num_in_signals == 2))) { 1089 //this means that way_select is driving NAND2 in decoder. 1090 width_nand2_path_n[0] = g_tp.min_w_nmos_; 1091 width_nand2_path_p[0] = p_to_n_sz_ratio * width_nand2_path_n[0]; 1092 F = c_load_nand2_path_out / gate_C(width_nand2_path_n[0] + width_nand2_path_p[0], 0, is_dram_); 1093 number_gates_nand2_path = logical_effort( 1094 min_number_gates, 1095 1, 1096 F, 1097 width_nand2_path_n, 1098 width_nand2_path_p, 1099 c_load_nand2_path_out, 1100 p_to_n_sz_ratio, 1101 is_dram_, false, g_tp.max_w_nmos_); 1102 } 1103 1104 if ((blk->flag_two_unique_paths) || 1105 (blk->number_inputs_L1_gate == 3) || 1106 ((way_select) && (dec->num_in_signals == 3))) { 1107 //this means that way_select is driving NAND3 in decoder. 1108 width_nand3_path_n[0] = g_tp.min_w_nmos_; 1109 width_nand3_path_p[0] = p_to_n_sz_ratio * width_nand3_path_n[0]; 1110 F = c_load_nand3_path_out / gate_C(width_nand3_path_n[0] + width_nand3_path_p[0], 0, is_dram_); 1111 number_gates_nand3_path = logical_effort( 1112 min_number_gates, 1113 1, 1114 F, 1115 width_nand3_path_n, 1116 width_nand3_path_p, 1117 c_load_nand3_path_out, 1118 p_to_n_sz_ratio, 1119 is_dram_, false, g_tp.max_w_nmos_); 1120 } 1121 } 1122} 1123 1124 1125 1126void PredecBlkDrv::compute_area() { 1127 double area_nand2_path = 0; 1128 double area_nand3_path = 0; 1129 double leak_nand2_path = 0; 1130 double leak_nand3_path = 0; 1131 double gate_leak_nand2_path = 0; 1132 double gate_leak_nand3_path = 0; 1133 1134 if (flag_driver_exists) { 1135 // first check whether a predecoder block driver is needed 1136 for (int i = 0; i < number_gates_nand2_path; ++i) { 1137 area_nand2_path += 1138 compute_gate_area(INV, 1, width_nand2_path_p[i], 1139 width_nand2_path_n[i], g_tp.cell_h_def); 1140 leak_nand2_path += 1141 cmos_Isub_leakage(width_nand2_path_n[i], width_nand2_path_p[i], 1142 1, inv, is_dram_); 1143 gate_leak_nand2_path += 1144 cmos_Ig_leakage(width_nand2_path_n[i], width_nand2_path_p[i], 1145 1, inv, is_dram_); 1146 } 1147 area_nand2_path *= (num_buffers_driving_1_nand2_load + 1148 num_buffers_driving_2_nand2_load + 1149 num_buffers_driving_4_nand2_load); 1150 leak_nand2_path *= (num_buffers_driving_1_nand2_load + 1151 num_buffers_driving_2_nand2_load + 1152 num_buffers_driving_4_nand2_load); 1153 gate_leak_nand2_path *= (num_buffers_driving_1_nand2_load + 1154 num_buffers_driving_2_nand2_load + 1155 num_buffers_driving_4_nand2_load); 1156 1157 for (int i = 0; i < number_gates_nand3_path; ++i) { 1158 area_nand3_path += 1159 compute_gate_area(INV, 1, width_nand3_path_p[i], 1160 width_nand3_path_n[i], g_tp.cell_h_def); 1161 leak_nand3_path += 1162 cmos_Isub_leakage(width_nand3_path_n[i], width_nand3_path_p[i], 1163 1, inv, is_dram_); 1164 gate_leak_nand3_path += 1165 cmos_Ig_leakage(width_nand3_path_n[i], width_nand3_path_p[i], 1166 1, inv, is_dram_); 1167 } 1168 area_nand3_path *= (num_buffers_driving_2_nand3_load + num_buffers_driving_8_nand3_load); 1169 leak_nand3_path *= (num_buffers_driving_2_nand3_load + num_buffers_driving_8_nand3_load); 1170 gate_leak_nand3_path *= (num_buffers_driving_2_nand3_load + num_buffers_driving_8_nand3_load); 1171 1172 power_nand2_path.readOp.leakage = leak_nand2_path * g_tp.peri_global.Vdd; 1173 power_nand3_path.readOp.leakage = leak_nand3_path * g_tp.peri_global.Vdd; 1174 power_nand2_path.readOp.gate_leakage = gate_leak_nand2_path * g_tp.peri_global.Vdd; 1175 power_nand3_path.readOp.gate_leakage = gate_leak_nand3_path * g_tp.peri_global.Vdd; 1176 area.set_area(area_nand2_path + area_nand3_path); 1177 } 1178} 1179 1180 1181 1182pair<double, double> PredecBlkDrv::compute_delays( 1183 double inrisetime_nand2_path, 1184 double inrisetime_nand3_path) { 1185 pair<double, double> ret_val; 1186 ret_val.first = 0; // outrisetime_nand2_path 1187 ret_val.second = 0; // outrisetime_nand3_path 1188 int i; 1189 double rd, c_gate_load, c_load, c_intrinsic, tf, this_delay; 1190 double Vdd = g_tp.peri_global.Vdd; 1191 1192 if (flag_driver_exists) { 1193 for (i = 0; i < number_gates_nand2_path - 1; ++i) { 1194 rd = tr_R_on(width_nand2_path_n[i], NCH, 1, is_dram_); 1195 c_gate_load = gate_C(width_nand2_path_p[i+1] + width_nand2_path_n[i+1], 0.0, is_dram_); 1196 c_intrinsic = drain_C_(width_nand2_path_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1197 drain_C_(width_nand2_path_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1198 tf = rd * (c_intrinsic + c_gate_load); 1199 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 1200 delay_nand2_path += this_delay; 1201 inrisetime_nand2_path = this_delay / (1.0 - 0.5); 1202 power_nand2_path.readOp.dynamic += (c_gate_load + c_intrinsic) * 0.5 * Vdd * Vdd; 1203 } 1204 1205 // Final inverter drives the predecoder block or the decoder output load 1206 if (number_gates_nand2_path != 0) { 1207 i = number_gates_nand2_path - 1; 1208 rd = tr_R_on(width_nand2_path_n[i], NCH, 1, is_dram_); 1209 c_intrinsic = drain_C_(width_nand2_path_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1210 drain_C_(width_nand2_path_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1211 c_load = c_load_nand2_path_out; 1212 tf = rd * (c_intrinsic + c_load) + r_load_nand2_path_out * c_load / 2; 1213 this_delay = horowitz(inrisetime_nand2_path, tf, 0.5, 0.5, RISE); 1214 delay_nand2_path += this_delay; 1215 ret_val.first = this_delay / (1.0 - 0.5); 1216 power_nand2_path.readOp.dynamic += (c_intrinsic + c_load) * 0.5 * Vdd * Vdd; 1217// cout<< "c_intrinsic = " << c_intrinsic << "c_load" << c_load <<endl; 1218 } 1219 1220 for (i = 0; i < number_gates_nand3_path - 1; ++i) { 1221 rd = tr_R_on(width_nand3_path_n[i], NCH, 1, is_dram_); 1222 c_gate_load = gate_C(width_nand3_path_p[i+1] + width_nand3_path_n[i+1], 0.0, is_dram_); 1223 c_intrinsic = drain_C_(width_nand3_path_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1224 drain_C_(width_nand3_path_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1225 tf = rd * (c_intrinsic + c_gate_load); 1226 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 1227 delay_nand3_path += this_delay; 1228 inrisetime_nand3_path = this_delay / (1.0 - 0.5); 1229 power_nand3_path.readOp.dynamic += (c_gate_load + c_intrinsic) * 0.5 * Vdd * Vdd; 1230 } 1231 1232 // Final inverter drives the predecoder block or the decoder output load 1233 if (number_gates_nand3_path != 0) { 1234 i = number_gates_nand3_path - 1; 1235 rd = tr_R_on(width_nand3_path_n[i], NCH, 1, is_dram_); 1236 c_intrinsic = drain_C_(width_nand3_path_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1237 drain_C_(width_nand3_path_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1238 c_load = c_load_nand3_path_out; 1239 tf = rd * (c_intrinsic + c_load) + r_load_nand3_path_out * c_load / 2; 1240 this_delay = horowitz(inrisetime_nand3_path, tf, 0.5, 0.5, RISE); 1241 delay_nand3_path += this_delay; 1242 ret_val.second = this_delay / (1.0 - 0.5); 1243 power_nand3_path.readOp.dynamic += (c_intrinsic + c_load) * 0.5 * Vdd * Vdd; 1244 } 1245 } 1246 return ret_val; 1247} 1248 1249 1250double PredecBlkDrv::get_rdOp_dynamic_E(int num_act_mats_hor_dir) { 1251 return (num_addr_bits_nand2_path()*power_nand2_path.readOp.dynamic + 1252 num_addr_bits_nand3_path()*power_nand3_path.readOp.dynamic) * num_act_mats_hor_dir; 1253} 1254 1255 1256 1257Predec::Predec( 1258 PredecBlkDrv * drv1_, 1259 PredecBlkDrv * drv2_) 1260 : blk1(drv1_->blk), blk2(drv2_->blk), drv1(drv1_), drv2(drv2_) { 1261 driver_power.readOp.leakage = drv1->power_nand2_path.readOp.leakage + 1262 drv1->power_nand3_path.readOp.leakage + 1263 drv2->power_nand2_path.readOp.leakage + 1264 drv2->power_nand3_path.readOp.leakage; 1265 block_power.readOp.leakage = blk1->power_nand2_path.readOp.leakage + 1266 blk1->power_nand3_path.readOp.leakage + 1267 blk1->power_L2.readOp.leakage + 1268 blk2->power_nand2_path.readOp.leakage + 1269 blk2->power_nand3_path.readOp.leakage + 1270 blk2->power_L2.readOp.leakage; 1271 power.readOp.leakage = driver_power.readOp.leakage + block_power.readOp.leakage; 1272 1273 driver_power.readOp.gate_leakage = drv1->power_nand2_path.readOp.gate_leakage + 1274 drv1->power_nand3_path.readOp.gate_leakage + 1275 drv2->power_nand2_path.readOp.gate_leakage + 1276 drv2->power_nand3_path.readOp.gate_leakage; 1277 block_power.readOp.gate_leakage = blk1->power_nand2_path.readOp.gate_leakage + 1278 blk1->power_nand3_path.readOp.gate_leakage + 1279 blk1->power_L2.readOp.gate_leakage + 1280 blk2->power_nand2_path.readOp.gate_leakage + 1281 blk2->power_nand3_path.readOp.gate_leakage + 1282 blk2->power_L2.readOp.gate_leakage; 1283 power.readOp.gate_leakage = driver_power.readOp.gate_leakage + block_power.readOp.gate_leakage; 1284} 1285 1286void PredecBlkDrv::leakage_feedback(double temperature) 1287{ 1288 double leak_nand2_path = 0; 1289 double leak_nand3_path = 0; 1290 double gate_leak_nand2_path = 0; 1291 double gate_leak_nand3_path = 0; 1292 1293 if (flag_driver_exists) 1294 { // first check whether a predecoder block driver is needed 1295 for (int i = 0; i < number_gates_nand2_path; ++i) 1296 { 1297 leak_nand2_path += cmos_Isub_leakage(width_nand2_path_n[i], width_nand2_path_p[i], 1, inv,is_dram_); 1298 gate_leak_nand2_path += cmos_Ig_leakage(width_nand2_path_n[i], width_nand2_path_p[i], 1, inv,is_dram_); 1299 } 1300 leak_nand2_path *= (num_buffers_driving_1_nand2_load + 1301 num_buffers_driving_2_nand2_load + 1302 num_buffers_driving_4_nand2_load); 1303 gate_leak_nand2_path *= (num_buffers_driving_1_nand2_load + 1304 num_buffers_driving_2_nand2_load + 1305 num_buffers_driving_4_nand2_load); 1306 1307 for (int i = 0; i < number_gates_nand3_path; ++i) 1308 { 1309 leak_nand3_path += cmos_Isub_leakage(width_nand3_path_n[i], width_nand3_path_p[i], 1, inv,is_dram_); 1310 gate_leak_nand3_path += cmos_Ig_leakage(width_nand3_path_n[i], width_nand3_path_p[i], 1, inv,is_dram_); 1311 } 1312 leak_nand3_path *= (num_buffers_driving_2_nand3_load + num_buffers_driving_8_nand3_load); 1313 gate_leak_nand3_path *= (num_buffers_driving_2_nand3_load + num_buffers_driving_8_nand3_load); 1314 1315 power_nand2_path.readOp.leakage = leak_nand2_path * g_tp.peri_global.Vdd; 1316 power_nand3_path.readOp.leakage = leak_nand3_path * g_tp.peri_global.Vdd; 1317 power_nand2_path.readOp.gate_leakage = gate_leak_nand2_path * g_tp.peri_global.Vdd; 1318 power_nand3_path.readOp.gate_leakage = gate_leak_nand3_path * g_tp.peri_global.Vdd; 1319 } 1320} 1321 1322double Predec::compute_delays(double inrisetime) { 1323 // TODO: Jung Ho thinks that predecoder block driver locates between decoder and predecoder block. 1324 pair<double, double> tmp_pair1, tmp_pair2; 1325 tmp_pair1 = drv1->compute_delays(inrisetime, inrisetime); 1326 tmp_pair1 = blk1->compute_delays(tmp_pair1); 1327 tmp_pair2 = drv2->compute_delays(inrisetime, inrisetime); 1328 tmp_pair2 = blk2->compute_delays(tmp_pair2); 1329 tmp_pair1 = get_max_delay_before_decoder(tmp_pair1, tmp_pair2); 1330 1331 driver_power.readOp.dynamic = 1332 drv1->num_addr_bits_nand2_path() * drv1->power_nand2_path.readOp.dynamic + 1333 drv1->num_addr_bits_nand3_path() * drv1->power_nand3_path.readOp.dynamic + 1334 drv2->num_addr_bits_nand2_path() * drv2->power_nand2_path.readOp.dynamic + 1335 drv2->num_addr_bits_nand3_path() * drv2->power_nand3_path.readOp.dynamic; 1336 1337 block_power.readOp.dynamic = 1338 blk1->power_nand2_path.readOp.dynamic * blk1->num_L1_active_nand2_path + 1339 blk1->power_nand3_path.readOp.dynamic * blk1->num_L1_active_nand3_path + 1340 blk1->power_L2.readOp.dynamic + 1341 blk2->power_nand2_path.readOp.dynamic * blk1->num_L1_active_nand2_path + 1342 blk2->power_nand3_path.readOp.dynamic * blk1->num_L1_active_nand3_path + 1343 blk2->power_L2.readOp.dynamic; 1344 1345 power.readOp.dynamic = driver_power.readOp.dynamic + block_power.readOp.dynamic; 1346 1347 delay = tmp_pair1.first; 1348 return tmp_pair1.second; 1349} 1350 1351void Predec::leakage_feedback(double temperature) 1352{ 1353 drv1->leakage_feedback(temperature); 1354 drv2->leakage_feedback(temperature); 1355 blk1->leakage_feedback(temperature); 1356 blk2->leakage_feedback(temperature); 1357 1358 driver_power.readOp.leakage = drv1->power_nand2_path.readOp.leakage + 1359 drv1->power_nand3_path.readOp.leakage + 1360 drv2->power_nand2_path.readOp.leakage + 1361 drv2->power_nand3_path.readOp.leakage; 1362 block_power.readOp.leakage = blk1->power_nand2_path.readOp.leakage + 1363 blk1->power_nand3_path.readOp.leakage + 1364 blk1->power_L2.readOp.leakage + 1365 blk2->power_nand2_path.readOp.leakage + 1366 blk2->power_nand3_path.readOp.leakage + 1367 blk2->power_L2.readOp.leakage; 1368 power.readOp.leakage = driver_power.readOp.leakage + block_power.readOp.leakage; 1369 1370 driver_power.readOp.gate_leakage = drv1->power_nand2_path.readOp.gate_leakage + 1371 drv1->power_nand3_path.readOp.gate_leakage + 1372 drv2->power_nand2_path.readOp.gate_leakage + 1373 drv2->power_nand3_path.readOp.gate_leakage; 1374 block_power.readOp.gate_leakage = blk1->power_nand2_path.readOp.gate_leakage + 1375 blk1->power_nand3_path.readOp.gate_leakage + 1376 blk1->power_L2.readOp.gate_leakage + 1377 blk2->power_nand2_path.readOp.gate_leakage + 1378 blk2->power_nand3_path.readOp.gate_leakage + 1379 blk2->power_L2.readOp.gate_leakage; 1380 power.readOp.gate_leakage = driver_power.readOp.gate_leakage + block_power.readOp.gate_leakage; 1381} 1382 1383// returns <delay, risetime> 1384pair<double, double> Predec::get_max_delay_before_decoder( 1385 pair<double, double> input_pair1, 1386 pair<double, double> input_pair2) { 1387 pair<double, double> ret_val; 1388 double delay; 1389 1390 delay = drv1->delay_nand2_path + blk1->delay_nand2_path; 1391 ret_val.first = delay; 1392 ret_val.second = input_pair1.first; 1393 delay = drv1->delay_nand3_path + blk1->delay_nand3_path; 1394 if (ret_val.first < delay) { 1395 ret_val.first = delay; 1396 ret_val.second = input_pair1.second; 1397 } 1398 delay = drv2->delay_nand2_path + blk2->delay_nand2_path; 1399 if (ret_val.first < delay) { 1400 ret_val.first = delay; 1401 ret_val.second = input_pair2.first; 1402 } 1403 delay = drv2->delay_nand3_path + blk2->delay_nand3_path; 1404 if (ret_val.first < delay) { 1405 ret_val.first = delay; 1406 ret_val.second = input_pair2.second; 1407 } 1408 1409 return ret_val; 1410} 1411 1412 1413 1414Driver::Driver(double c_gate_load_, double c_wire_load_, double r_wire_load_, 1415 bool is_dram) 1416 : number_gates(0), 1417 min_number_gates(2), 1418 c_gate_load(c_gate_load_), 1419 c_wire_load(c_wire_load_), 1420 r_wire_load(r_wire_load_), 1421 delay(0), 1422 power(), 1423 is_dram_(is_dram) { 1424 for (int i = 0; i < MAX_NUMBER_GATES_STAGE; i++) { 1425 width_n[i] = 0; 1426 width_p[i] = 0; 1427 } 1428 1429 compute_widths(); 1430} 1431 1432 1433void Driver::compute_widths() { 1434 double p_to_n_sz_ratio = pmos_to_nmos_sz_ratio(is_dram_); 1435 double c_load = c_gate_load + c_wire_load; 1436 width_n[0] = g_tp.min_w_nmos_; 1437 width_p[0] = p_to_n_sz_ratio * g_tp.min_w_nmos_; 1438 1439 double F = c_load / gate_C(width_n[0] + width_p[0], 0, is_dram_); 1440 number_gates = logical_effort( 1441 min_number_gates, 1442 1, 1443 F, 1444 width_n, 1445 width_p, 1446 c_load, 1447 p_to_n_sz_ratio, 1448 is_dram_, false, 1449 g_tp.max_w_nmos_); 1450} 1451 1452 1453 1454double Driver::compute_delay(double inrisetime) { 1455 int i; 1456 double rd, c_load, c_intrinsic, tf; 1457 double this_delay = 0; 1458 1459 for (i = 0; i < number_gates - 1; ++i) { 1460 rd = tr_R_on(width_n[i], NCH, 1, is_dram_); 1461 c_load = gate_C(width_n[i+1] + width_p[i+1], 0.0, is_dram_); 1462 c_intrinsic = drain_C_(width_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1463 drain_C_(width_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1464 tf = rd * (c_intrinsic + c_load); 1465 this_delay = horowitz(inrisetime, tf, 0.5, 0.5, RISE); 1466 delay += this_delay; 1467 inrisetime = this_delay / (1.0 - 0.5); 1468 power.readOp.dynamic += (c_intrinsic + c_load) * g_tp.peri_global.Vdd * 1469 g_tp.peri_global.Vdd; 1470 power.readOp.leakage += 1471 cmos_Isub_leakage(width_n[i], width_p[i], 1, inv, is_dram_) * 1472 g_tp.peri_global.Vdd; 1473 power.readOp.gate_leakage += 1474 cmos_Ig_leakage(width_n[i], width_p[i], 1, inv, is_dram_) * 1475 g_tp.peri_global.Vdd; 1476 } 1477 1478 i = number_gates - 1; 1479 c_load = c_gate_load + c_wire_load; 1480 rd = tr_R_on(width_n[i], NCH, 1, is_dram_); 1481 c_intrinsic = drain_C_(width_p[i], PCH, 1, 1, g_tp.cell_h_def, is_dram_) + 1482 drain_C_(width_n[i], NCH, 1, 1, g_tp.cell_h_def, is_dram_); 1483 tf = rd * (c_intrinsic + c_load) + r_wire_load * 1484 (c_wire_load / 2 + c_gate_load); 1485 this_delay = horowitz(inrisetime, tf, 0.5, 0.5, RISE); 1486 delay += this_delay; 1487 power.readOp.dynamic += (c_intrinsic + c_load) * g_tp.peri_global.Vdd * 1488 g_tp.peri_global.Vdd; 1489 power.readOp.leakage += 1490 cmos_Isub_leakage(width_n[i], width_p[i], 1, inv, is_dram_) * 1491 g_tp.peri_global.Vdd; 1492 power.readOp.gate_leakage += 1493 cmos_Ig_leakage(width_n[i], width_p[i], 1, inv, is_dram_) * 1494 g_tp.peri_global.Vdd; 1495 1496 return this_delay / (1.0 - 0.5); 1497} 1498 1499