ext/dsent/model/std_cells/NAND2.cc - public/gem5 - Git at Google

 /* Copyright (c) 2012 Massachusetts Institute of Technology
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */

 #include "model/std_cells/NAND2.h"

 #include <cmath>

 #include "model/PortInfo.h"
 #include "model/TransitionInfo.h"
 #include "model/EventInfo.h"
 #include "model/std_cells/StdCellLib.h"
 #include "model/std_cells/CellMacros.h"
 #include "model/timing_graph/ElectricalNet.h"
 #include "model/timing_graph/ElectricalDriver.h"
 #include "model/timing_graph/ElectricalLoad.h"
 #include "model/timing_graph/ElectricalDelay.h"

 namespace DSENT
 {
     using std::ceil;
     using std::max;

     NAND2::NAND2(const String& instance_name_, const TechModel* tech_model_)
         : StdCell(instance_name_, tech_model_)
     {
         initProperties();
     }

     NAND2::~NAND2()
     {}

     void NAND2::initProperties()
     {
         return;
     }

     void NAND2::constructModel()
     {
         // All constructModel should do is create Area/NDDPower/Energy Results as
         // well as instantiate any sub-instances using only the hard parameters

         createInputPort("A");
         createInputPort("B");
         createOutputPort("Y");

         createLoad("A_Cap");
         createLoad("B_Cap");
         createDelay("A_to_Y_delay");
         createDelay("B_to_Y_delay");
         createDriver("Y_Ron", true);

         ElectricalLoad* a_cap = getLoad("A_Cap");
         ElectricalLoad* b_cap = getLoad("A_Cap");
         ElectricalDelay* a_to_y_delay = getDelay("A_to_Y_delay");
         ElectricalDelay* b_to_y_delay = getDelay("B_to_Y_delay");
         ElectricalDriver* y_ron = getDriver("Y_Ron");

         getNet("A")->addDownstreamNode(a_cap);
         getNet("B")->addDownstreamNode(b_cap);
         a_cap->addDownstreamNode(a_to_y_delay);
         b_cap->addDownstreamNode(b_to_y_delay);
         a_to_y_delay->addDownstreamNode(y_ron);
         b_to_y_delay->addDownstreamNode(y_ron);
         y_ron->addDownstreamNode(getNet("Y"));

         // Create Area result
         // Create NDD Power result
         createElectricalAtomicResults();
         // Create NAND Event Energy Result
         createElectricalEventAtomicResult("NAND2");

         getEventInfo("Idle")->setStaticTransitionInfos();

         return;
     }

     void NAND2::updateModel()
     {
         // All updateModel should do is calculate numbers for the Area/NDDPower/Energy
         // Results as anything else that needs to be done using either soft or hard parameters

         // Get parameters
         double drive_strength = getDrivingStrength();
         Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();

         // Standard cell cache string
         String cell_name = "NAND2_X" + (String) drive_strength;

         // Get timing parameters
         getLoad("A_Cap")->setLoadCap(cache->get(cell_name + "->Cap->A"));
         getLoad("B_Cap")->setLoadCap(cache->get(cell_name + "->Cap->B"));
         getDelay("A_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->A_to_Y"));
         getDelay("B_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->B_to_Y"));
         getDriver("Y_Ron")->setOutputRes(cache->get(cell_name + "->DriveRes->Y"));

         // Set the cell area
         getAreaResult("Active")->setValue(cache->get(cell_name + "->Area->Active"));
         getAreaResult("Metal1Wire")->setValue(cache->get(cell_name + "->Area->Active"));

         return;
     }

     void NAND2::useModel()
     {
         // Get parameters
         double drive_strength = getDrivingStrength();
         Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();

         // Standard cell cache string
         String cell_name = "NAND2_X" + (String) drive_strength;

         // Propagate the transition info and get the 0->1 transtion count
         propagateTransitionInfo();
         double P_A = getInputPort("A")->getTransitionInfo().getProbability1();
         double P_B = getInputPort("B")->getTransitionInfo().getProbability1();
         double Y_num_trans_01 = getOutputPort("Y")->getTransitionInfo().getNumberTransitions01();

         // Calculate leakage
         double leakage = 0;
         leakage += cache->get(cell_name + "->Leakage->!A!B") * (1 - P_A) * (1 - P_B);
         leakage += cache->get(cell_name + "->Leakage->!AB") * (1 - P_A) * P_B;
         leakage += cache->get(cell_name + "->Leakage->A!B") * P_A * (1 - P_B);
         leakage += cache->get(cell_name + "->Leakage->AB") * P_A * P_B;
         getNddPowerResult("Leakage")->setValue(leakage);

         // Get capacitances
         double y_cap = cache->get(cell_name + "->Cap->Y");
         double y_load_cap = getNet("Y")->getTotalDownstreamCap();

         // Get VDD
         double vdd = getTechModel()->get("Vdd");

         // Calculate NAND2Event energy
         double energy_per_trans_01 = (y_cap + y_load_cap) * vdd * vdd;
         getEventResult("NAND2")->setValue(energy_per_trans_01 * Y_num_trans_01);

         return;
     }

     void NAND2::propagateTransitionInfo()
     {
         // Get input signal transition info
         const TransitionInfo& trans_A = getInputPort("A")->getTransitionInfo();
         const TransitionInfo& trans_B = getInputPort("B")->getTransitionInfo();

         double max_freq_mult = max(trans_A.getFrequencyMultiplier(), trans_B.getFrequencyMultiplier());
         const TransitionInfo& scaled_trans_A = trans_A.scaleFrequencyMultiplier(max_freq_mult);
         const TransitionInfo& scaled_trans_B = trans_B.scaleFrequencyMultiplier(max_freq_mult);

         double A_prob_00 = scaled_trans_A.getNumberTransitions00() / max_freq_mult;
         double A_prob_01 = scaled_trans_A.getNumberTransitions01() / max_freq_mult;
         double A_prob_10 = A_prob_01;
         double A_prob_11 = scaled_trans_A.getNumberTransitions11() / max_freq_mult;
         double B_prob_00 = scaled_trans_B.getNumberTransitions00() / max_freq_mult;
         double B_prob_01 = scaled_trans_B.getNumberTransitions01() / max_freq_mult;
         double B_prob_10 = B_prob_01;
         double B_prob_11 = scaled_trans_B.getNumberTransitions11() / max_freq_mult;

         // Set output transition info
         double Y_prob_00 = A_prob_11 * B_prob_11;
         double Y_prob_01 = A_prob_11 * B_prob_10 +
                         A_prob_10 * (B_prob_11 + B_prob_10);
         double Y_prob_11 = A_prob_00 +
                         A_prob_01 * (B_prob_00 + B_prob_10) +
                         A_prob_10 * (B_prob_00 + B_prob_01) +
                         A_prob_11 * B_prob_00;

         // Check that probabilities add up to 1.0 with some finite tolerance
         ASSERT(LibUtil::Math::isEqual((Y_prob_00 + Y_prob_01 + Y_prob_01 + Y_prob_11), 1.0),
             "[Error] " + getInstanceName() +  "Output transition probabilities must add up to 1 (" +
             (String) Y_prob_00 + ", " + (String) Y_prob_01 + ", " + (String) Y_prob_11 + ")!");

         // Turn probability of transitions per cycle into number of transitions per time unit
         TransitionInfo trans_Y(Y_prob_00 * max_freq_mult, Y_prob_01 * max_freq_mult, Y_prob_11 * max_freq_mult);
         getOutputPort("Y")->setTransitionInfo(trans_Y);
         return;
     }

     void NAND2::cacheStdCell(StdCellLib* cell_lib_, double drive_strength_)
     {
         // Standard cell cache string
         String cell_name = "NAND2_X" + (String) drive_strength_;

         Log::printLine("=== " + cell_name + " ===");

         // Get parameters
         double gate_pitch = cell_lib_->getTechModel()->get("Gate->PitchContacted");
         Map<double>* cache = cell_lib_->getStdCellCache();

         // Now actually build the full standard cell model
         // Create the two input ports
         createInputPort("A");
         createInputPort("B");
         createOutputPort("Y");

         // Adds macros
         CellMacros::addNand2(this, "NAND", true, true, true, "A", "B", "Y");
         CellMacros::updateNand2(this, "NAND", drive_strength_);

         // Cache area result
         double area = gate_pitch * getTotalHeight() * (1 + getGenProperties()->get("NAND_GatePitches").toDouble());
         cache->set(cell_name + "->Area->Active", area);
         Log::printLine(cell_name + "->Area->Active=" + (String) area);

         // --------------------------------------------------------------------
         // Leakage Model Calculation
         // --------------------------------------------------------------------
         double leakage_00 = getGenProperties()->get("NAND_LeakagePower_00").toDouble();
         double leakage_01 = getGenProperties()->get("NAND_LeakagePower_01").toDouble();
         double leakage_10 = getGenProperties()->get("NAND_LeakagePower_10").toDouble();
         double leakage_11 = getGenProperties()->get("NAND_LeakagePower_11").toDouble();
         cache->set(cell_name + "->Leakage->!A!B", leakage_00);
         cache->set(cell_name + "->Leakage->!AB", leakage_01);
         cache->set(cell_name + "->Leakage->A!B", leakage_10);
         cache->set(cell_name + "->Leakage->AB", leakage_11);
         Log::printLine(cell_name + "->Leakage->!A!B=" + (String) leakage_00);
         Log::printLine(cell_name + "->Leakage->!AB=" + (String) leakage_01);
         Log::printLine(cell_name + "->Leakage->A!B=" + (String) leakage_10);
         Log::printLine(cell_name + "->Leakage->AB=" + (String) leakage_11);
         // --------------------------------------------------------------------

         // Cache event energy results
         /*
         double event_a_flip = getGenProperties()->get("NAND_A1_Flip").toDouble();
         double event_b_flip = getGenProperties()->get("NAND_A2_Flip").toDouble();
         double event_y_flip = getGenProperties()->get("NAND_ZN_Flip").toDouble();

         cache->set(cell_name + "->Event_A_Flip", event_a_flip);
         cache->set(cell_name + "->Event_B_Flip", event_b_flip);
         cache->set(cell_name + "->Event_Y_Flip", event_y_flip);
         Log::printLine(cell_name + "->Event_A_Flip=" + (String) event_a_flip);
         Log::printLine(cell_name + "->Event_B_Flip=" + (String) event_b_flip);
         Log::printLine(cell_name + "->Event_Y_Flip=" + (String) event_y_flip);
         */
         // --------------------------------------------------------------------
         // Get Node Capacitances
         // --------------------------------------------------------------------
         double a_cap = getNet("A")->getTotalDownstreamCap();
         double b_cap = getNet("B")->getTotalDownstreamCap();
         double y_cap = getNet("Y")->getTotalDownstreamCap();

         cache->set(cell_name + "->Cap->A", a_cap);
         cache->set(cell_name + "->Cap->B", b_cap);
         cache->set(cell_name + "->Cap->Y", y_cap);
         Log::printLine(cell_name + "->Cap->A=" + (String) a_cap);
         Log::printLine(cell_name + "->Cap->B=" + (String) b_cap);
         Log::printLine(cell_name + "->Cap->Y=" + (String) y_cap);
         // --------------------------------------------------------------------

         // --------------------------------------------------------------------
         // Build Internal Delay Model
         // --------------------------------------------------------------------
         double y_ron = getDriver("NAND_RonZN")->getOutputRes();
         double a_to_y_delay = getDriver("NAND_RonZN")->calculateDelay();
         double b_to_y_delay = getDriver("NAND_RonZN")->calculateDelay();

         cache->set(cell_name + "->DriveRes->Y", y_ron);
         cache->set(cell_name + "->Delay->A_to_Y", a_to_y_delay);
         cache->set(cell_name + "->Delay->B_to_Y", b_to_y_delay);
         Log::printLine(cell_name + "->DriveRes->Y=" + (String) y_ron);
         Log::printLine(cell_name + "->Delay->A_to_Y=" + (String) a_to_y_delay);
         Log::printLine(cell_name + "->Delay->B_to_Y=" + (String) b_to_y_delay);
         // --------------------------------------------------------------------

         return;

     }

 } // namespace DSENT
	/* Copyright (c) 2012 Massachusetts Institute of Technology
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/

	#include "model/std_cells/NAND2.h"

	#include <cmath>

	#include "model/PortInfo.h"
	#include "model/TransitionInfo.h"
	#include "model/EventInfo.h"
	#include "model/std_cells/StdCellLib.h"
	#include "model/std_cells/CellMacros.h"
	#include "model/timing_graph/ElectricalNet.h"
	#include "model/timing_graph/ElectricalDriver.h"
	#include "model/timing_graph/ElectricalLoad.h"
	#include "model/timing_graph/ElectricalDelay.h"

	namespace DSENT
	{
	using std::ceil;
	using std::max;

	NAND2::NAND2(const String& instance_name_, const TechModel* tech_model_)
	: StdCell(instance_name_, tech_model_)
	{
	initProperties();
	}

	NAND2::~NAND2()
	{}

	void NAND2::initProperties()
	{
	return;
	}

	void NAND2::constructModel()
	{
	// All constructModel should do is create Area/NDDPower/Energy Results as
	// well as instantiate any sub-instances using only the hard parameters

	createInputPort("A");
	createInputPort("B");
	createOutputPort("Y");

	createLoad("A_Cap");
	createLoad("B_Cap");
	createDelay("A_to_Y_delay");
	createDelay("B_to_Y_delay");
	createDriver("Y_Ron", true);

	ElectricalLoad* a_cap = getLoad("A_Cap");
	ElectricalLoad* b_cap = getLoad("A_Cap");
	ElectricalDelay* a_to_y_delay = getDelay("A_to_Y_delay");
	ElectricalDelay* b_to_y_delay = getDelay("B_to_Y_delay");
	ElectricalDriver* y_ron = getDriver("Y_Ron");

	getNet("A")->addDownstreamNode(a_cap);
	getNet("B")->addDownstreamNode(b_cap);
	a_cap->addDownstreamNode(a_to_y_delay);
	b_cap->addDownstreamNode(b_to_y_delay);
	a_to_y_delay->addDownstreamNode(y_ron);
	b_to_y_delay->addDownstreamNode(y_ron);
	y_ron->addDownstreamNode(getNet("Y"));

	// Create Area result
	// Create NDD Power result
	createElectricalAtomicResults();
	// Create NAND Event Energy Result
	createElectricalEventAtomicResult("NAND2");

	getEventInfo("Idle")->setStaticTransitionInfos();

	return;
	}

	void NAND2::updateModel()
	{
	// All updateModel should do is calculate numbers for the Area/NDDPower/Energy
	// Results as anything else that needs to be done using either soft or hard parameters

	// Get parameters
	double drive_strength = getDrivingStrength();
	Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();

	// Standard cell cache string
	String cell_name = "NAND2_X" + (String) drive_strength;

	// Get timing parameters
	getLoad("A_Cap")->setLoadCap(cache->get(cell_name + "->Cap->A"));
	getLoad("B_Cap")->setLoadCap(cache->get(cell_name + "->Cap->B"));
	getDelay("A_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->A_to_Y"));
	getDelay("B_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->B_to_Y"));
	getDriver("Y_Ron")->setOutputRes(cache->get(cell_name + "->DriveRes->Y"));

	// Set the cell area
	getAreaResult("Active")->setValue(cache->get(cell_name + "->Area->Active"));
	getAreaResult("Metal1Wire")->setValue(cache->get(cell_name + "->Area->Active"));

	return;
	}

	void NAND2::useModel()
	{
	// Get parameters
	double drive_strength = getDrivingStrength();
	Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();

	// Standard cell cache string
	String cell_name = "NAND2_X" + (String) drive_strength;

	// Propagate the transition info and get the 0->1 transtion count
	propagateTransitionInfo();
	double P_A = getInputPort("A")->getTransitionInfo().getProbability1();
	double P_B = getInputPort("B")->getTransitionInfo().getProbability1();
	double Y_num_trans_01 = getOutputPort("Y")->getTransitionInfo().getNumberTransitions01();

	// Calculate leakage
	double leakage = 0;
	leakage += cache->get(cell_name + "->Leakage->!A!B") * (1 - P_A) * (1 - P_B);
	leakage += cache->get(cell_name + "->Leakage->!AB") * (1 - P_A) * P_B;
	leakage += cache->get(cell_name + "->Leakage->A!B") * P_A * (1 - P_B);
	leakage += cache->get(cell_name + "->Leakage->AB") * P_A * P_B;
	getNddPowerResult("Leakage")->setValue(leakage);

	// Get capacitances
	double y_cap = cache->get(cell_name + "->Cap->Y");
	double y_load_cap = getNet("Y")->getTotalDownstreamCap();

	// Get VDD
	double vdd = getTechModel()->get("Vdd");

	// Calculate NAND2Event energy
	double energy_per_trans_01 = (y_cap + y_load_cap) * vdd * vdd;
	getEventResult("NAND2")->setValue(energy_per_trans_01 * Y_num_trans_01);

	return;
	}

	void NAND2::propagateTransitionInfo()
	{
	// Get input signal transition info
	const TransitionInfo& trans_A = getInputPort("A")->getTransitionInfo();
	const TransitionInfo& trans_B = getInputPort("B")->getTransitionInfo();

	double max_freq_mult = max(trans_A.getFrequencyMultiplier(), trans_B.getFrequencyMultiplier());
	const TransitionInfo& scaled_trans_A = trans_A.scaleFrequencyMultiplier(max_freq_mult);
	const TransitionInfo& scaled_trans_B = trans_B.scaleFrequencyMultiplier(max_freq_mult);

	double A_prob_00 = scaled_trans_A.getNumberTransitions00() / max_freq_mult;
	double A_prob_01 = scaled_trans_A.getNumberTransitions01() / max_freq_mult;
	double A_prob_10 = A_prob_01;
	double A_prob_11 = scaled_trans_A.getNumberTransitions11() / max_freq_mult;
	double B_prob_00 = scaled_trans_B.getNumberTransitions00() / max_freq_mult;
	double B_prob_01 = scaled_trans_B.getNumberTransitions01() / max_freq_mult;
	double B_prob_10 = B_prob_01;
	double B_prob_11 = scaled_trans_B.getNumberTransitions11() / max_freq_mult;

	// Set output transition info
	double Y_prob_00 = A_prob_11 * B_prob_11;
	double Y_prob_01 = A_prob_11 * B_prob_10 +
	A_prob_10 * (B_prob_11 + B_prob_10);
	double Y_prob_11 = A_prob_00 +
	A_prob_01 * (B_prob_00 + B_prob_10) +
	A_prob_10 * (B_prob_00 + B_prob_01) +
	A_prob_11 * B_prob_00;

	// Check that probabilities add up to 1.0 with some finite tolerance
	ASSERT(LibUtil::Math::isEqual((Y_prob_00 + Y_prob_01 + Y_prob_01 + Y_prob_11), 1.0),
	"[Error] " + getInstanceName() + "Output transition probabilities must add up to 1 (" +
	(String) Y_prob_00 + ", " + (String) Y_prob_01 + ", " + (String) Y_prob_11 + ")!");

	// Turn probability of transitions per cycle into number of transitions per time unit
	TransitionInfo trans_Y(Y_prob_00 * max_freq_mult, Y_prob_01 * max_freq_mult, Y_prob_11 * max_freq_mult);
	getOutputPort("Y")->setTransitionInfo(trans_Y);
	return;
	}

	void NAND2::cacheStdCell(StdCellLib* cell_lib_, double drive_strength_)
	{
	// Standard cell cache string
	String cell_name = "NAND2_X" + (String) drive_strength_;

	Log::printLine("=== " + cell_name + " ===");

	// Get parameters
	double gate_pitch = cell_lib_->getTechModel()->get("Gate->PitchContacted");
	Map<double>* cache = cell_lib_->getStdCellCache();

	// Now actually build the full standard cell model
	// Create the two input ports
	createInputPort("A");
	createInputPort("B");
	createOutputPort("Y");

	// Adds macros
	CellMacros::addNand2(this, "NAND", true, true, true, "A", "B", "Y");
	CellMacros::updateNand2(this, "NAND", drive_strength_);

	// Cache area result
	double area = gate_pitch * getTotalHeight() * (1 + getGenProperties()->get("NAND_GatePitches").toDouble());
	cache->set(cell_name + "->Area->Active", area);
	Log::printLine(cell_name + "->Area->Active=" + (String) area);

	// --------------------------------------------------------------------
	// Leakage Model Calculation
	// --------------------------------------------------------------------
	double leakage_00 = getGenProperties()->get("NAND_LeakagePower_00").toDouble();
	double leakage_01 = getGenProperties()->get("NAND_LeakagePower_01").toDouble();
	double leakage_10 = getGenProperties()->get("NAND_LeakagePower_10").toDouble();
	double leakage_11 = getGenProperties()->get("NAND_LeakagePower_11").toDouble();
	cache->set(cell_name + "->Leakage->!A!B", leakage_00);
	cache->set(cell_name + "->Leakage->!AB", leakage_01);
	cache->set(cell_name + "->Leakage->A!B", leakage_10);
	cache->set(cell_name + "->Leakage->AB", leakage_11);
	Log::printLine(cell_name + "->Leakage->!A!B=" + (String) leakage_00);
	Log::printLine(cell_name + "->Leakage->!AB=" + (String) leakage_01);
	Log::printLine(cell_name + "->Leakage->A!B=" + (String) leakage_10);
	Log::printLine(cell_name + "->Leakage->AB=" + (String) leakage_11);
	// --------------------------------------------------------------------

	// Cache event energy results
	/*
	double event_a_flip = getGenProperties()->get("NAND_A1_Flip").toDouble();
	double event_b_flip = getGenProperties()->get("NAND_A2_Flip").toDouble();
	double event_y_flip = getGenProperties()->get("NAND_ZN_Flip").toDouble();

	cache->set(cell_name + "->Event_A_Flip", event_a_flip);
	cache->set(cell_name + "->Event_B_Flip", event_b_flip);
	cache->set(cell_name + "->Event_Y_Flip", event_y_flip);
	Log::printLine(cell_name + "->Event_A_Flip=" + (String) event_a_flip);
	Log::printLine(cell_name + "->Event_B_Flip=" + (String) event_b_flip);
	Log::printLine(cell_name + "->Event_Y_Flip=" + (String) event_y_flip);
	*/
	// --------------------------------------------------------------------
	// Get Node Capacitances
	// --------------------------------------------------------------------
	double a_cap = getNet("A")->getTotalDownstreamCap();
	double b_cap = getNet("B")->getTotalDownstreamCap();
	double y_cap = getNet("Y")->getTotalDownstreamCap();

	cache->set(cell_name + "->Cap->A", a_cap);
	cache->set(cell_name + "->Cap->B", b_cap);
	cache->set(cell_name + "->Cap->Y", y_cap);
	Log::printLine(cell_name + "->Cap->A=" + (String) a_cap);
	Log::printLine(cell_name + "->Cap->B=" + (String) b_cap);
	Log::printLine(cell_name + "->Cap->Y=" + (String) y_cap);
	// --------------------------------------------------------------------

	// --------------------------------------------------------------------
	// Build Internal Delay Model
	// --------------------------------------------------------------------
	double y_ron = getDriver("NAND_RonZN")->getOutputRes();
	double a_to_y_delay = getDriver("NAND_RonZN")->calculateDelay();
	double b_to_y_delay = getDriver("NAND_RonZN")->calculateDelay();

	cache->set(cell_name + "->DriveRes->Y", y_ron);
	cache->set(cell_name + "->Delay->A_to_Y", a_to_y_delay);
	cache->set(cell_name + "->Delay->B_to_Y", b_to_y_delay);
	Log::printLine(cell_name + "->DriveRes->Y=" + (String) y_ron);
	Log::printLine(cell_name + "->Delay->A_to_Y=" + (String) a_to_y_delay);
	Log::printLine(cell_name + "->Delay->B_to_Y=" + (String) b_to_y_delay);
	// --------------------------------------------------------------------

	return;

	}

	} // namespace DSENT