110448Snilay@cs.wisc.edu/* Copyright (c) 2012 Massachusetts Institute of Technology 210448Snilay@cs.wisc.edu * 310448Snilay@cs.wisc.edu * Permission is hereby granted, free of charge, to any person obtaining a copy 410448Snilay@cs.wisc.edu * of this software and associated documentation files (the "Software"), to deal 510448Snilay@cs.wisc.edu * in the Software without restriction, including without limitation the rights 610448Snilay@cs.wisc.edu * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 710448Snilay@cs.wisc.edu * copies of the Software, and to permit persons to whom the Software is 810448Snilay@cs.wisc.edu * furnished to do so, subject to the following conditions: 910448Snilay@cs.wisc.edu * 1010448Snilay@cs.wisc.edu * The above copyright notice and this permission notice shall be included in 1110448Snilay@cs.wisc.edu * all copies or substantial portions of the Software. 1210448Snilay@cs.wisc.edu * 1310448Snilay@cs.wisc.edu * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1410448Snilay@cs.wisc.edu * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1510448Snilay@cs.wisc.edu * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1610448Snilay@cs.wisc.edu * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 1710448Snilay@cs.wisc.edu * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 1810448Snilay@cs.wisc.edu * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 1910448Snilay@cs.wisc.edu * THE SOFTWARE. 2010448Snilay@cs.wisc.edu */ 2110448Snilay@cs.wisc.edu 2210447Snilay@cs.wisc.edu#include "tech/TechModel.h" 2310447Snilay@cs.wisc.edu 2410447Snilay@cs.wisc.edu#include <cmath> 2510447Snilay@cs.wisc.edu 2610447Snilay@cs.wisc.edu#include "model/std_cells/StdCellLib.h" 2710447Snilay@cs.wisc.edu 2810447Snilay@cs.wisc.edunamespace DSENT 2910447Snilay@cs.wisc.edu{ 3010447Snilay@cs.wisc.edu TechModel::TechModel() 3110448Snilay@cs.wisc.edu : m_std_cell_lib_(NULL), m_available_wire_layers_(NULL) 3210447Snilay@cs.wisc.edu {} 3310447Snilay@cs.wisc.edu 3410447Snilay@cs.wisc.edu TechModel::~TechModel() 3510447Snilay@cs.wisc.edu {} 3610447Snilay@cs.wisc.edu 3710448Snilay@cs.wisc.edu const String& TechModel::get(const String &key_) const 3810448Snilay@cs.wisc.edu { 3910448Snilay@cs.wisc.edu return params.at(key_); 4010448Snilay@cs.wisc.edu } 4110448Snilay@cs.wisc.edu 4210447Snilay@cs.wisc.edu void TechModel::setStdCellLib(const StdCellLib* std_cell_lib_) 4310447Snilay@cs.wisc.edu { 4410447Snilay@cs.wisc.edu m_std_cell_lib_ = std_cell_lib_; 4510447Snilay@cs.wisc.edu return; 4610447Snilay@cs.wisc.edu } 4710447Snilay@cs.wisc.edu 4810447Snilay@cs.wisc.edu const StdCellLib* TechModel::getStdCellLib() const 4910447Snilay@cs.wisc.edu { 5010447Snilay@cs.wisc.edu return m_std_cell_lib_; 5110447Snilay@cs.wisc.edu } 5210447Snilay@cs.wisc.edu 5310447Snilay@cs.wisc.edu TechModel* TechModel::clone() const 5410447Snilay@cs.wisc.edu { 5510447Snilay@cs.wisc.edu return new TechModel(*this); 5610447Snilay@cs.wisc.edu } 5710447Snilay@cs.wisc.edu 5810447Snilay@cs.wisc.edu void TechModel::readFile(const String& filename_) 5910447Snilay@cs.wisc.edu { 6010447Snilay@cs.wisc.edu // Read the main technology file 6110448Snilay@cs.wisc.edu LibUtil::readFile(filename_, params); 6210447Snilay@cs.wisc.edu 6310447Snilay@cs.wisc.edu // Search for "INCLUDE" to include more technology files 6410448Snilay@cs.wisc.edu for (const auto &it : params) 6510447Snilay@cs.wisc.edu { 6610448Snilay@cs.wisc.edu const String& key = it.first; 6710447Snilay@cs.wisc.edu if(key.compare(0, 8, "INCLUDE_") == 0) 6810447Snilay@cs.wisc.edu { 6910448Snilay@cs.wisc.edu const String& include_filename = it.second; 7010448Snilay@cs.wisc.edu LibUtil::readFile(include_filename, params); 7110447Snilay@cs.wisc.edu } 7210447Snilay@cs.wisc.edu } 7310447Snilay@cs.wisc.edu 7410447Snilay@cs.wisc.edu // Set the available wire layers 7510447Snilay@cs.wisc.edu const vector<String>& available_wire_layer_vector = get("Wire->AvailableLayers").split("[,]"); 7610447Snilay@cs.wisc.edu m_available_wire_layers_ = new std::set<String>; 7710447Snilay@cs.wisc.edu for(unsigned int i = 0; i < available_wire_layer_vector.size(); ++i) 7810447Snilay@cs.wisc.edu { 7910447Snilay@cs.wisc.edu m_available_wire_layers_->insert(available_wire_layer_vector[i]); 8010447Snilay@cs.wisc.edu } 8110447Snilay@cs.wisc.edu } 8210447Snilay@cs.wisc.edu 8310447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 8410447Snilay@cs.wisc.edu // Transistor Related Functions 8510447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 8610447Snilay@cs.wisc.edu //Returns the leakage current of NMOS transistors, given the transistor stakcing, transistor widths, and input combination 8710447Snilay@cs.wisc.edu double TechModel::calculateNmosLeakageCurrent(unsigned int num_stacks_, double uni_stacked_mos_width_, unsigned int input_vector_) const 8810447Snilay@cs.wisc.edu { 8910447Snilay@cs.wisc.edu vector<double> stacked_mos_widths_(num_stacks_, uni_stacked_mos_width_); 9010447Snilay@cs.wisc.edu return calculateNmosLeakageCurrent(num_stacks_, stacked_mos_widths_, input_vector_); 9110447Snilay@cs.wisc.edu } 9210447Snilay@cs.wisc.edu 9310447Snilay@cs.wisc.edu //Returns the leakage current of NMOS transistors, given the transistor stakcing, transistor widths, and input combination 9410447Snilay@cs.wisc.edu double TechModel::calculateNmosLeakageCurrent(unsigned int num_stacks_, const vector<double>& stacked_mos_widths_, unsigned int input_vector_) const 9510447Snilay@cs.wisc.edu { 9610447Snilay@cs.wisc.edu // Get technology parameters 9710447Snilay@cs.wisc.edu double vdd = get("Vdd"); 9810447Snilay@cs.wisc.edu double temp = get("Temperature"); 9910447Snilay@cs.wisc.edu double char_temp = get("Nmos->CharacterizedTemperature"); 10010447Snilay@cs.wisc.edu double min_off_current = get("Nmos->MinOffCurrent"); 10110447Snilay@cs.wisc.edu double off_current = get("Nmos->OffCurrent"); 10210447Snilay@cs.wisc.edu double subthreshold_swing = get("Nmos->SubthresholdSwing"); 10310447Snilay@cs.wisc.edu double dibl = get("Nmos->DIBL"); 10410447Snilay@cs.wisc.edu double temp_swing = get("Nmos->SubthresholdTempSwing"); 10510447Snilay@cs.wisc.edu 10610447Snilay@cs.wisc.edu // Map dibl to a swing value for easier calculation 10710447Snilay@cs.wisc.edu double dibl_swing = subthreshold_swing / dibl; 10810447Snilay@cs.wisc.edu 10910447Snilay@cs.wisc.edu //Calculate the leakage current factor 11010447Snilay@cs.wisc.edu double leakage_current_factor = calculateLeakageCurrentFactor(num_stacks_, stacked_mos_widths_, input_vector_, vdd, subthreshold_swing, dibl_swing); 11110447Snilay@cs.wisc.edu 11210447Snilay@cs.wisc.edu // Calcualte actual leakage current at characterized temperature 11310447Snilay@cs.wisc.edu double leakage_current_char_tmp = stacked_mos_widths_[0] * off_current * std::pow(10.0, leakage_current_factor); 11410447Snilay@cs.wisc.edu leakage_current_char_tmp = std::max(min_off_current, leakage_current_char_tmp); 11510447Snilay@cs.wisc.edu 11610447Snilay@cs.wisc.edu // Calculate actual leakage current at temp 11710447Snilay@cs.wisc.edu double leakage_current = leakage_current_char_tmp * std::pow(10.0, (temp - char_temp) / temp_swing); 11810447Snilay@cs.wisc.edu 11910447Snilay@cs.wisc.edu return leakage_current; 12010447Snilay@cs.wisc.edu } 12110447Snilay@cs.wisc.edu 12210447Snilay@cs.wisc.edu double TechModel::calculatePmosLeakageCurrent(unsigned int num_stacks_, double uni_stacked_mos_width_, unsigned int input_vector_) const 12310447Snilay@cs.wisc.edu { 12410447Snilay@cs.wisc.edu vector<double> stacked_mos_widths_(num_stacks_, uni_stacked_mos_width_); 12510447Snilay@cs.wisc.edu return calculatePmosLeakageCurrent(num_stacks_, stacked_mos_widths_, input_vector_); 12610447Snilay@cs.wisc.edu } 12710447Snilay@cs.wisc.edu 12810447Snilay@cs.wisc.edu //Returns the leakage current of PMOS transistors, given the transistor stakcing, transistor widths, and input combination 12910447Snilay@cs.wisc.edu double TechModel::calculatePmosLeakageCurrent(unsigned int num_stacks_, const vector<double>& stacked_mos_widths_, unsigned int input_vector_) const 13010447Snilay@cs.wisc.edu { 13110447Snilay@cs.wisc.edu // Get technology parameters 13210447Snilay@cs.wisc.edu double vdd = get("Vdd"); 13310447Snilay@cs.wisc.edu double temp = get("Temperature"); 13410447Snilay@cs.wisc.edu double char_temp = get("Pmos->CharacterizedTemperature"); 13510447Snilay@cs.wisc.edu double min_off_current = get("Pmos->MinOffCurrent"); 13610447Snilay@cs.wisc.edu double off_current = get("Pmos->OffCurrent"); 13710447Snilay@cs.wisc.edu double dibl = get("Pmos->DIBL"); 13810447Snilay@cs.wisc.edu double subthreshold_swing = get("Pmos->SubthresholdSwing"); 13910447Snilay@cs.wisc.edu double temp_swing = get("Nmos->SubthresholdTempSwing"); 14010447Snilay@cs.wisc.edu 14110447Snilay@cs.wisc.edu // Map dibl to a swing value for easier calculation 14210447Snilay@cs.wisc.edu double dibl_swing = subthreshold_swing / dibl; 14310447Snilay@cs.wisc.edu 14410447Snilay@cs.wisc.edu //Calculate the leakage current factor 14510447Snilay@cs.wisc.edu double leakage_current_factor = calculateLeakageCurrentFactor(num_stacks_, stacked_mos_widths_, input_vector_, vdd, subthreshold_swing, dibl_swing); 14610447Snilay@cs.wisc.edu 14710447Snilay@cs.wisc.edu // Calcualte actual leakage current at characterized temperature 14810447Snilay@cs.wisc.edu double leakage_current_char_tmp = stacked_mos_widths_[0] * off_current * std::pow(10.0, leakage_current_factor); 14910447Snilay@cs.wisc.edu leakage_current_char_tmp = std::max(min_off_current, leakage_current_char_tmp); 15010447Snilay@cs.wisc.edu 15110447Snilay@cs.wisc.edu // Calculate actual leakage current at temp 15210447Snilay@cs.wisc.edu double leakage_current = leakage_current_char_tmp * std::pow(10.0, (temp - char_temp) / temp_swing); 15310447Snilay@cs.wisc.edu 15410447Snilay@cs.wisc.edu return leakage_current; 15510447Snilay@cs.wisc.edu } 15610447Snilay@cs.wisc.edu 15710447Snilay@cs.wisc.edu //Returns the leakage current, given the transistor stakcing, transistor widths, input combination, 15810447Snilay@cs.wisc.edu //and technology information (vdd, subthreshold swing, subthreshold dibl swing) 15910447Snilay@cs.wisc.edu double TechModel::calculateLeakageCurrentFactor(unsigned int num_stacks_, const vector<double>& stacked_mos_widths_, unsigned int input_vector_, double vdd_, double subthreshold_swing_, double dibl_swing_) const 16010447Snilay@cs.wisc.edu { 16110447Snilay@cs.wisc.edu // check everything is valid 16210447Snilay@cs.wisc.edu ASSERT(num_stacks_ >= 1, "[Error] Number of stacks must be >= 1!"); 16310447Snilay@cs.wisc.edu ASSERT(stacked_mos_widths_.size() == num_stacks_, "[Error] Mismatch in number of stacks and the widths specified!"); 16410447Snilay@cs.wisc.edu 16510447Snilay@cs.wisc.edu //Use short name in this method 16610447Snilay@cs.wisc.edu const double s1 = subthreshold_swing_; 16710447Snilay@cs.wisc.edu const double s2 = dibl_swing_; 16810447Snilay@cs.wisc.edu 16910447Snilay@cs.wisc.edu // Decode input combinations from input_vector_ 17010447Snilay@cs.wisc.edu std::vector<double> vs(num_stacks_, 0.0); 17110447Snilay@cs.wisc.edu for(int i = 0; i < (int)num_stacks_; ++i) 17210447Snilay@cs.wisc.edu { 17310447Snilay@cs.wisc.edu double current_input = (double(input_vector_ & 0x1))*vdd_; 17410447Snilay@cs.wisc.edu vs[i] = (current_input); 17510447Snilay@cs.wisc.edu input_vector_ >>= 1; 17610447Snilay@cs.wisc.edu } 17710447Snilay@cs.wisc.edu // If the widths pointer is NULL, width is set to 1 by default 17810447Snilay@cs.wisc.edu vector<double> ws = stacked_mos_widths_; 17910447Snilay@cs.wisc.edu 18010447Snilay@cs.wisc.edu //Solve voltages at internal nodes of stacked transistors 18110447Snilay@cs.wisc.edu // v[0] = 0 18210447Snilay@cs.wisc.edu // v[num_stacks_] = vdd_ 18310447Snilay@cs.wisc.edu // v[i] = (1.0/(2*s1 + s2))*((s1 + s2)*v[i - 1] + s1*v[i + 1] 18410447Snilay@cs.wisc.edu // + s2*(vs[i + 1] - vs[i]) + s1*s2*log10(ws[i + 1]/ws[i])) 18510447Snilay@cs.wisc.edu //Use tri-matrix solver to solve the above linear system 18610447Snilay@cs.wisc.edu 18710447Snilay@cs.wisc.edu double A = -(s1 + s2); 18810447Snilay@cs.wisc.edu double B = 2*s1 + s2; 18910447Snilay@cs.wisc.edu double C = -s1; 19010447Snilay@cs.wisc.edu std::vector<double> a(num_stacks_ - 1, 0); 19110447Snilay@cs.wisc.edu std::vector<double> b(num_stacks_ - 1, 0); 19210447Snilay@cs.wisc.edu std::vector<double> c(num_stacks_ - 1, 0); 19310447Snilay@cs.wisc.edu std::vector<double> d(num_stacks_ - 1, 0); 19410447Snilay@cs.wisc.edu std::vector<double> v(num_stacks_ + 1, 0); 19510447Snilay@cs.wisc.edu unsigned int eff_num_stacks = num_stacks_; 19610447Snilay@cs.wisc.edu bool is_found_valid_v = false; 19710447Snilay@cs.wisc.edu do 19810447Snilay@cs.wisc.edu { 19910447Snilay@cs.wisc.edu //Set boundary condition 20010447Snilay@cs.wisc.edu v[0] = 0; 20110447Snilay@cs.wisc.edu v[eff_num_stacks] = vdd_; 20210447Snilay@cs.wisc.edu 20310447Snilay@cs.wisc.edu //If the effective number of stacks is 1, no matrix needs to be solved 20410447Snilay@cs.wisc.edu if(eff_num_stacks == 1) 20510447Snilay@cs.wisc.edu { 20610447Snilay@cs.wisc.edu break; 20710447Snilay@cs.wisc.edu } 20810447Snilay@cs.wisc.edu 20910447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 21010447Snilay@cs.wisc.edu //Setup the tri-matrix 21110447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 21210447Snilay@cs.wisc.edu for(int i = 0; i < (int)eff_num_stacks-2; ++i) 21310447Snilay@cs.wisc.edu { 21410447Snilay@cs.wisc.edu a[i + 1] = A; 21510447Snilay@cs.wisc.edu c[i] = C; 21610447Snilay@cs.wisc.edu } 21710447Snilay@cs.wisc.edu for(int i = 0; i < (int)eff_num_stacks-1; ++i) 21810447Snilay@cs.wisc.edu { 21910447Snilay@cs.wisc.edu b[i] = B; 22010447Snilay@cs.wisc.edu d[i] = s2*(vs[i + 1] - vs[i]) + s1*s2*std::log10(ws[i + 1]/ws[i]); 22110447Snilay@cs.wisc.edu if(i == ((int)eff_num_stacks - 2)) 22210447Snilay@cs.wisc.edu { 22310447Snilay@cs.wisc.edu d[i] -= C*vdd_; 22410447Snilay@cs.wisc.edu } 22510447Snilay@cs.wisc.edu } 22610447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 22710447Snilay@cs.wisc.edu 22810447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 22910447Snilay@cs.wisc.edu //Solve the tri-matrix 23010447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 23110447Snilay@cs.wisc.edu for(int i = 1; i < (int)eff_num_stacks-1; ++i) 23210447Snilay@cs.wisc.edu { 23310447Snilay@cs.wisc.edu double m = a[i]/b[i - 1]; 23410447Snilay@cs.wisc.edu b[i] -= m*c[i - 1]; 23510447Snilay@cs.wisc.edu d[i] -= m*d[i - 1]; 23610447Snilay@cs.wisc.edu } 23710447Snilay@cs.wisc.edu 23810447Snilay@cs.wisc.edu v[eff_num_stacks - 1] = d[eff_num_stacks - 2]/b[eff_num_stacks - 2]; 23910447Snilay@cs.wisc.edu for(int i = eff_num_stacks - 3; i >= 0; --i) 24010447Snilay@cs.wisc.edu { 24110447Snilay@cs.wisc.edu v[i + 1] = (d[i] - c[i]*v[i + 2])/b[i]; 24210447Snilay@cs.wisc.edu } 24310447Snilay@cs.wisc.edu //---------------------------------------------------------------------- 24410447Snilay@cs.wisc.edu 24510447Snilay@cs.wisc.edu //Check if the internal voltages are in increasing order 24610447Snilay@cs.wisc.edu is_found_valid_v = true; 24710447Snilay@cs.wisc.edu for(int i = 1; i <= (int)eff_num_stacks; ++i) 24810447Snilay@cs.wisc.edu { 24910447Snilay@cs.wisc.edu //If the ith internal voltage is not in increasing order 25010447Snilay@cs.wisc.edu //(i-1)th transistor is in triode region 25110447Snilay@cs.wisc.edu //Remove the transistors in triode region as it does not exist 25210447Snilay@cs.wisc.edu if(v[i] < v[i - 1]) 25310447Snilay@cs.wisc.edu { 25410447Snilay@cs.wisc.edu is_found_valid_v = false; 25510447Snilay@cs.wisc.edu eff_num_stacks--; 25610447Snilay@cs.wisc.edu vs.erase(vs.begin() + i - 1); 25710447Snilay@cs.wisc.edu ws.erase(ws.begin() + i - 1); 25810447Snilay@cs.wisc.edu break; 25910447Snilay@cs.wisc.edu } 26010447Snilay@cs.wisc.edu } 26110447Snilay@cs.wisc.edu } while(!is_found_valid_v); 26210447Snilay@cs.wisc.edu 26310447Snilay@cs.wisc.edu //Calculate the leakage current of the bottom transistor (first not in triode region) 26410447Snilay@cs.wisc.edu double vgs = vs[0] - v[0]; 26510447Snilay@cs.wisc.edu double vds = v[1] - v[0]; 26610447Snilay@cs.wisc.edu double leakage_current_factor = vgs/s1 + (vds - vdd_)/s2; 26710447Snilay@cs.wisc.edu //TODO - Check if the leakage current calculate for other transistors is identical 26810447Snilay@cs.wisc.edu 26910447Snilay@cs.wisc.edu return leakage_current_factor; 27010447Snilay@cs.wisc.edu } 27110447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 27210447Snilay@cs.wisc.edu 27310447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 27410447Snilay@cs.wisc.edu // Wire Related Functions 27510447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 27610447Snilay@cs.wisc.edu bool TechModel::isWireLayerExist(const String& layer_name_) const 27710447Snilay@cs.wisc.edu { 27810447Snilay@cs.wisc.edu std::set<String>::const_iterator it; 27910447Snilay@cs.wisc.edu it = m_available_wire_layers_->find(layer_name_); 28010447Snilay@cs.wisc.edu return (it != m_available_wire_layers_->end()); 28110447Snilay@cs.wisc.edu } 28210447Snilay@cs.wisc.edu 28310447Snilay@cs.wisc.edu const std::set<String>* TechModel::getAvailableWireLayers() const 28410447Snilay@cs.wisc.edu { 28510447Snilay@cs.wisc.edu return m_available_wire_layers_; 28610447Snilay@cs.wisc.edu } 28710447Snilay@cs.wisc.edu 28810447Snilay@cs.wisc.edu double TechModel::calculateWireCapacitance(const String& layer_name_, double width_, double spacing_, double length_) const 28910447Snilay@cs.wisc.edu { 29010447Snilay@cs.wisc.edu // Get technology parameter 29110447Snilay@cs.wisc.edu double min_width = get("Wire->" + layer_name_ + "->MinWidth").toDouble(); 29210447Snilay@cs.wisc.edu double min_spacing = get("Wire->" + layer_name_ + "->MinSpacing").toDouble(); 29310447Snilay@cs.wisc.edu double metal_thickness = get("Wire->" + layer_name_ + "->MetalThickness").toDouble(); 29410447Snilay@cs.wisc.edu double dielec_thickness = get("Wire->" + layer_name_ + "->DielectricThickness").toDouble(); 29510447Snilay@cs.wisc.edu double dielec_const = get("Wire->" + layer_name_ + "->DielectricConstant").toDouble(); 29610447Snilay@cs.wisc.edu 29710447Snilay@cs.wisc.edu ASSERT(width_ >= min_width, "[Error] Wire width must be >= " + (String) min_width + "!"); 29810447Snilay@cs.wisc.edu ASSERT(spacing_ >= min_spacing, "[Error] Wire spacing must be >= " + (String) min_spacing + "!"); 29910447Snilay@cs.wisc.edu ASSERT(length_ >= 0, "[Error] Wire length must be >= 0!"); 30010447Snilay@cs.wisc.edu 30110447Snilay@cs.wisc.edu double A, B, C; 30210447Snilay@cs.wisc.edu // Calculate ground capacitance 30310447Snilay@cs.wisc.edu A = width_ / dielec_thickness; 30410447Snilay@cs.wisc.edu B = 2.04*std::pow((spacing_ / (spacing_ + 0.54 * dielec_thickness)), 1.77); 30510447Snilay@cs.wisc.edu C = std::pow((metal_thickness / (metal_thickness + 4.53 * dielec_thickness)), 0.07); 30610447Snilay@cs.wisc.edu double unit_gnd_cap = dielec_const * 8.85e-12 * (A + B * C); 30710447Snilay@cs.wisc.edu 30810447Snilay@cs.wisc.edu A = 1.14 * (metal_thickness / spacing_) * std::exp(-4.0 * spacing_ / (spacing_ + 8.01 * dielec_thickness)); 30910447Snilay@cs.wisc.edu B = 2.37 * std::pow((width_ / (width_ + 0.31 * spacing_)), 0.28); 31010447Snilay@cs.wisc.edu C = std::pow((dielec_thickness / (dielec_thickness + 8.96 * spacing_)), 0.76) * 31110447Snilay@cs.wisc.edu std::exp(-2.0 * spacing_ / (spacing_ + 6.0 * dielec_thickness)); 31210447Snilay@cs.wisc.edu double unit_coupling_cap = dielec_const * 8.85e-12 * (A + B * C); 31310447Snilay@cs.wisc.edu 31410447Snilay@cs.wisc.edu double total_cap = 2 * (unit_gnd_cap + unit_coupling_cap) * length_; 31510447Snilay@cs.wisc.edu return total_cap; 31610447Snilay@cs.wisc.edu } 31710447Snilay@cs.wisc.edu 31810447Snilay@cs.wisc.edu double TechModel::calculateWireResistance(const String& layer_name_, double width_, double length_) const 31910447Snilay@cs.wisc.edu { 32010447Snilay@cs.wisc.edu // Get technology parameter 32110447Snilay@cs.wisc.edu double min_width = get("Wire->" + layer_name_ + "->MinWidth"); 32210447Snilay@cs.wisc.edu //double barrier_thickness = get("Wire->" + layer_name_ + "->BarrierThickness"); 32310447Snilay@cs.wisc.edu double resistivity = get("Wire->" + layer_name_ + "->Resistivity"); 32410447Snilay@cs.wisc.edu double metal_thickness = get("Wire->" + layer_name_ + "->MetalThickness"); 32510447Snilay@cs.wisc.edu 32610447Snilay@cs.wisc.edu ASSERT(width_ >= min_width, "[Error] Wire width must be >= " + (String) min_width + "!"); 32710447Snilay@cs.wisc.edu ASSERT(length_ >= 0, "[Error] Wire length must be >= 0!"); 32810447Snilay@cs.wisc.edu 32910447Snilay@cs.wisc.edu // Calculate Rho 33010447Snilay@cs.wisc.edu // double rho = 2.202e-8 + (1.030e-15 / (width_ - 2.0 * barrier_thickness)); 33110447Snilay@cs.wisc.edu 33210447Snilay@cs.wisc.edu double unit_res = resistivity / (width_ * metal_thickness); 33310447Snilay@cs.wisc.edu //double unit_res = rho / ((width_ - 2.0 * barrier_thickness) * (metal_thickness - barrier_thickness)); 33410447Snilay@cs.wisc.edu 33510447Snilay@cs.wisc.edu double total_res = unit_res * length_; 33610447Snilay@cs.wisc.edu return total_res; 33710447Snilay@cs.wisc.edu } 33810447Snilay@cs.wisc.edu //------------------------------------------------------------------------- 33910447Snilay@cs.wisc.edu 34010447Snilay@cs.wisc.edu TechModel::TechModel(const TechModel& tech_model_) 34110448Snilay@cs.wisc.edu : m_std_cell_lib_(tech_model_.m_std_cell_lib_), 34210448Snilay@cs.wisc.edu params(tech_model_.params) 34310447Snilay@cs.wisc.edu {} 34410447Snilay@cs.wisc.edu} // namespace DSENT 345