ext/dsent/model/electrical/RepeatedLink.cc - amd/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/electrical/RepeatedLink.h"

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

 namespace DSENT
 {
     RepeatedLink::RepeatedLink(const String& instance_name_, const TechModel* tech_model_)
         : ElectricalModel(instance_name_, tech_model_)
     {
         m_repeater_ = NULL;
         m_repeater_load_ = NULL;
         m_timing_tree_ = NULL;

         initParameters();
         initProperties();
     }

     RepeatedLink::~RepeatedLink()
     {
         delete m_repeater_;
         delete m_repeater_load_;
         delete m_timing_tree_;
     }

     void RepeatedLink::initParameters()
     {
         addParameterName("NumberBits");
         addParameterName("WireLayer");
         addParameterName("WireWidthMultiplier", 1.0);
         addParameterName("WireSpacingMultiplier", 1.0);
         return;
     }

     void RepeatedLink::initProperties()
     {
         addPropertyName("WireLength");
         addPropertyName("Delay");
         addPropertyName("IsKeepParity", "TRUE");
         return;
     }

     RepeatedLink* RepeatedLink::clone() const
     {
         // TODO
         return NULL;
     }

     void RepeatedLink::constructModel()
     {
         // Get parameters
         unsigned int number_bits = getParameter("NumberBits").toUInt();
         const String& wire_layer = getParameter("WireLayer");
         double wire_width_multiplier = getParameter("WireWidthMultiplier").toDouble();
         double wire_spacing_multiplier = getParameter("WireSpacingMultiplier").toDouble();

         ASSERT(number_bits > 0, "[Error] " + getInstanceName() +
                 " -> Number of bits must be > 0!");
         ASSERT(getTechModel()->isWireLayerExist(wire_layer), "[Error] " + getInstanceName() +
                 " -> Wire layer does not exist!");
         ASSERT(wire_width_multiplier >= 1.0, "[Error] " + getInstanceName() +
                 " -> Wire width multiplier must be >= 1.0!");
         ASSERT(wire_spacing_multiplier >= 1.0, "[Error] " + getInstanceName() +
                 " -> Wire spacing multiplier must be >= 1.0!");

         double wire_min_width = getTechModel()->get("Wire->" + wire_layer + "->MinWidth").toDouble();
         double wire_min_spacing = getTechModel()->get("Wire->" + wire_layer + "->MinSpacing").toDouble();

         double wire_width = wire_min_width * wire_width_multiplier;
         double wire_spacing = wire_min_spacing * wire_spacing_multiplier;

         double wire_cap_per_len = getTechModel()->calculateWireCapacitance(wire_layer, wire_width, wire_spacing, 1.0);
         double wire_res_per_len = getTechModel()->calculateWireResistance(wire_layer, wire_width, 1.0);

         getGenProperties()->set("WireWidth", wire_width);
         getGenProperties()->set("WireSpacing", wire_spacing);
         getGenProperties()->set("WireCapacitancePerLength", wire_cap_per_len);
         getGenProperties()->set("WireResistancePerLength", wire_res_per_len);

         // Create ports
         createInputPort("In", makeNetIndex(0, number_bits-1));
         createOutputPort("Out", makeNetIndex(0, number_bits-1));

         // Create area, power, and event results
         createElectricalAtomicResults();
         createElectricalEventAtomicResult("Send");

         // Create connections
         // Since the length is not set yet, we only to virtual fan-in and virtual fan-out
         createNet("InTmp");
         createNet("OutTmp");
         assignVirtualFanin("InTmp", "In");
         assignVirtualFanout("Out", "OutTmp");

         // Build Electrical Connectivity
         createLoad("In_Cap");
         createDelay("In_to_Out_delay");
         createDriver("Out_Ron", false); // Indicate this driver is not sizable

         ElectricalLoad* in_cap = getLoad("In_Cap");
         ElectricalDelay* in_to_out_delay = getDelay("In_to_Out_delay");
         ElectricalDriver* out_ron = getDriver("Out_Ron");

         getNet("InTmp")->addDownstreamNode(in_cap);
         in_cap->addDownstreamNode(in_to_out_delay);
         in_to_out_delay->addDownstreamNode(out_ron);
         out_ron->addDownstreamNode(getNet("OutTmp"));

         // Init a repeater and a load to mimic a segment of a repeated link
         m_repeater_ = getTechModel()->getStdCellLib()->createStdCell("INV", "Repeater");
         m_repeater_->construct();
         m_repeater_load_ = new ElectricalLoad("RepeaterIn_Cap", this);
         // Make path repeater_ -> repeater_load_
         // to catch the repeater's input/output cap and ensure only one inverter delay
         // is added
         m_repeater_->getNet("Y")->addDownstreamNode(m_repeater_load_);
         // Init a timing object to calculate delay
         m_timing_tree_ = new ElectricalTimingTree("RepeatedLink", this);
         m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
         return;
     }

     void RepeatedLink::updateModel()
     {
         unsigned int number_bits = getParameter("NumberBits").toUInt();

         // Get properties
         double wire_length = getProperty("WireLength").toDouble();
         double required_delay = getProperty("Delay").toDouble();
         bool isKeepParity = getProperty("IsKeepParity").toBool();

         ASSERT(wire_length >= 0, "[Error] " + getInstanceName() +
                 " -> Wire length must be >= 0!");
         ASSERT(required_delay >= 0, "[Error] " + getInstanceName() +
                 " -> Required delay must be >= 0!");

         const String& wire_layer = getParameter("WireLayer");
         double wire_width = getGenProperties()->get("WireWidth").toDouble();
         double wire_spacing = getGenProperties()->get("WireSpacing").toDouble();

         // Calculate the total wire cap and total wire res
         double wire_cap_per_len = getGenProperties()->get("WireCapacitancePerLength").toDouble();
         double wire_res_per_len = getGenProperties()->get("WireResistancePerLength").toDouble();
         double total_wire_cap = wire_cap_per_len * wire_length;
         double total_wire_res = wire_res_per_len * wire_length;

         m_repeater_->update();

         unsigned int increment_segments = (isKeepParity)? 2:1;
         unsigned int number_segments = increment_segments;
         double delay;
         m_repeater_->setMinDrivingStrength();
         m_repeater_->getNet("Y")->setDistributedCap(total_wire_cap / number_segments);
         m_repeater_->getNet("Y")->setDistributedRes(total_wire_res / number_segments);
         m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
         m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
         delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

         // If everything is 0, use number_segments min-sized repeater
         if(wire_length != 0)
         {
             // Set the initial number of segments based on isKeepParity
             double last_min_size_delay = 0;
             unsigned int iteration = 0;

             // First set the repeater to the minimum driving strength
             last_min_size_delay = delay;

             Log::printLine(getInstanceName() + " -> Beginning Repeater Insertion");

             while(required_delay < delay)
             {
                 Log::printLine(getInstanceName() + " -> Repeater Insertion Iteration " + (String)iteration +
                         ": Required delay = " + (String)required_delay +
                         ", Delay = " + (String)delay +
                         ", Slack = " + (String)(required_delay - delay) +
                         ", Number of repeaters = " + (String)number_segments);

                 // Size up if timing is not met
                 while(required_delay < delay)
                 {
                     if(m_repeater_->hasMaxDrivingStrength())
                     {
                         break;
                     }
                     m_repeater_->increaseDrivingStrength();
                     m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
                     m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
                     delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

                     iteration++;
                     Log::printLine(getInstanceName() + " -> Slack: " + (String)(required_delay - delay));
                 }
                 // Increase number of segments if timing is not met
                 if(required_delay < delay)
                 {
                     number_segments += increment_segments;
                     m_repeater_->setMinDrivingStrength();
                     m_repeater_->getNet("Y")->setDistributedCap(total_wire_cap / number_segments);
                     m_repeater_->getNet("Y")->setDistributedRes(total_wire_res / number_segments);
                     m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
                     m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
                     delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

                     // Abort if adding more min sized repeaters does not decrease the delay
                     if(delay > last_min_size_delay)
                     {
                         break;
                     }
                     last_min_size_delay = delay;
                 }
             }
             Log::printLine(getInstanceName() + " -> Repeater Insertion Ended after Iteration: " + (String)iteration +
                     ": Required delay = " + (String)required_delay +
                     ", Delay = " + (String)delay +
                     ", Slack = " + (String)(required_delay - delay) +
                     ", Number of repeaters = " + (String)number_segments);

             // Print a warning if the timing is not met
             if(required_delay < delay)
             {
                 const String& warning_msg = "[Warning] " + getInstanceName() + " -> Timing not met" +
                     ": Required delay = " + (String)required_delay +
                     ", Delay = " + (String)delay +
                     ", Slack = " + (String)(required_delay - delay) +
                     ", Number of repeaters = " + (String)number_segments;
                 Log::printLine(std::cerr, warning_msg);
             }
         }

         // Update electrical interfaces
         getLoad("In_Cap")->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
         getDelay("In_to_Out_delay")->setDelay(delay);
         getDriver("Out_Ron")->setOutputRes(m_repeater_->getDriver("Y_Ron")->getOutputRes() + (total_wire_res / number_segments));

         getGenProperties()->set("NumberSegments", number_segments);

         // Update area, power results
         resetElectricalAtomicResults();
         addElecticalAtomicResultValues(m_repeater_, number_segments * number_bits);
         double wire_area = wire_length * (wire_width + wire_spacing) * number_bits;
         addElecticalWireAtomicResultValue(wire_layer, wire_area);

         return;
     }

     void RepeatedLink::useModel()
     {
         // Update the transition information for the modeled repeater
         // Since we only modeled one repeater. So the transition information for 0->0 and 1->1
         // is averaged out
         const TransitionInfo& trans_In = getInputPort("In")->getTransitionInfo();
         double average_static_transition = (trans_In.getNumberTransitions00() + trans_In.getNumberTransitions11()) / 2.0;
         TransitionInfo mod_trans_In(average_static_transition, trans_In.getNumberTransitions01(), average_static_transition);
         m_repeater_->getInputPort("A")->setTransitionInfo(mod_trans_In);
         m_repeater_->use();

         // Get parameters
         unsigned int number_bits = getParameter("NumberBits").toUInt();
         unsigned int number_segments = getGenProperties()->get("NumberSegments").toUInt();

         // Propagate the transition information
         propagateTransitionInfo();

         // Update leakage power
         double power = 0.0;
         power += m_repeater_->getNddPowerResult("Leakage")->calculateSum() * number_segments * number_bits;
         getNddPowerResult("Leakage")->setValue(power);

         // Update event result
         double energy = 0.0;
         energy += m_repeater_->getEventResult("INV")->calculateSum() * number_segments * number_bits;
         getEventResult("Send")->setValue(energy);

         return;
     }

     void RepeatedLink::propagateTransitionInfo()
     {
         unsigned int number_segments = getGenProperties()->get("NumberSegments");

         if((number_segments % 2) == 0)
         {
             propagatePortTransitionInfo("Out", "In");
         }
         else
         {
             const TransitionInfo& trans_In = getInputPort("In")->getTransitionInfo();
             TransitionInfo trans_Out(trans_In.getNumberTransitions11(), trans_In.getNumberTransitions01(), trans_In.getNumberTransitions00());
             getOutputPort("Out")->setTransitionInfo(trans_Out);
         }
         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/electrical/RepeatedLink.h"

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

	namespace DSENT
	{
	RepeatedLink::RepeatedLink(const String& instance_name_, const TechModel* tech_model_)
	: ElectricalModel(instance_name_, tech_model_)
	{
	m_repeater_ = NULL;
	m_repeater_load_ = NULL;
	m_timing_tree_ = NULL;

	initParameters();
	initProperties();
	}

	RepeatedLink::~RepeatedLink()
	{
	delete m_repeater_;
	delete m_repeater_load_;
	delete m_timing_tree_;
	}

	void RepeatedLink::initParameters()
	{
	addParameterName("NumberBits");
	addParameterName("WireLayer");
	addParameterName("WireWidthMultiplier", 1.0);
	addParameterName("WireSpacingMultiplier", 1.0);
	return;
	}

	void RepeatedLink::initProperties()
	{
	addPropertyName("WireLength");
	addPropertyName("Delay");
	addPropertyName("IsKeepParity", "TRUE");
	return;
	}

	RepeatedLink* RepeatedLink::clone() const
	{
	// TODO
	return NULL;
	}

	void RepeatedLink::constructModel()
	{
	// Get parameters
	unsigned int number_bits = getParameter("NumberBits").toUInt();
	const String& wire_layer = getParameter("WireLayer");
	double wire_width_multiplier = getParameter("WireWidthMultiplier").toDouble();
	double wire_spacing_multiplier = getParameter("WireSpacingMultiplier").toDouble();

	ASSERT(number_bits > 0, "[Error] " + getInstanceName() +
	" -> Number of bits must be > 0!");
	ASSERT(getTechModel()->isWireLayerExist(wire_layer), "[Error] " + getInstanceName() +
	" -> Wire layer does not exist!");
	ASSERT(wire_width_multiplier >= 1.0, "[Error] " + getInstanceName() +
	" -> Wire width multiplier must be >= 1.0!");
	ASSERT(wire_spacing_multiplier >= 1.0, "[Error] " + getInstanceName() +
	" -> Wire spacing multiplier must be >= 1.0!");

	double wire_min_width = getTechModel()->get("Wire->" + wire_layer + "->MinWidth").toDouble();
	double wire_min_spacing = getTechModel()->get("Wire->" + wire_layer + "->MinSpacing").toDouble();

	double wire_width = wire_min_width * wire_width_multiplier;
	double wire_spacing = wire_min_spacing * wire_spacing_multiplier;

	double wire_cap_per_len = getTechModel()->calculateWireCapacitance(wire_layer, wire_width, wire_spacing, 1.0);
	double wire_res_per_len = getTechModel()->calculateWireResistance(wire_layer, wire_width, 1.0);

	getGenProperties()->set("WireWidth", wire_width);
	getGenProperties()->set("WireSpacing", wire_spacing);
	getGenProperties()->set("WireCapacitancePerLength", wire_cap_per_len);
	getGenProperties()->set("WireResistancePerLength", wire_res_per_len);

	// Create ports
	createInputPort("In", makeNetIndex(0, number_bits-1));
	createOutputPort("Out", makeNetIndex(0, number_bits-1));

	// Create area, power, and event results
	createElectricalAtomicResults();
	createElectricalEventAtomicResult("Send");

	// Create connections
	// Since the length is not set yet, we only to virtual fan-in and virtual fan-out
	createNet("InTmp");
	createNet("OutTmp");
	assignVirtualFanin("InTmp", "In");
	assignVirtualFanout("Out", "OutTmp");

	// Build Electrical Connectivity
	createLoad("In_Cap");
	createDelay("In_to_Out_delay");
	createDriver("Out_Ron", false); // Indicate this driver is not sizable

	ElectricalLoad* in_cap = getLoad("In_Cap");
	ElectricalDelay* in_to_out_delay = getDelay("In_to_Out_delay");
	ElectricalDriver* out_ron = getDriver("Out_Ron");

	getNet("InTmp")->addDownstreamNode(in_cap);
	in_cap->addDownstreamNode(in_to_out_delay);
	in_to_out_delay->addDownstreamNode(out_ron);
	out_ron->addDownstreamNode(getNet("OutTmp"));

	// Init a repeater and a load to mimic a segment of a repeated link
	m_repeater_ = getTechModel()->getStdCellLib()->createStdCell("INV", "Repeater");
	m_repeater_->construct();
	m_repeater_load_ = new ElectricalLoad("RepeaterIn_Cap", this);
	// Make path repeater_ -> repeater_load_
	// to catch the repeater's input/output cap and ensure only one inverter delay
	// is added
	m_repeater_->getNet("Y")->addDownstreamNode(m_repeater_load_);
	// Init a timing object to calculate delay
	m_timing_tree_ = new ElectricalTimingTree("RepeatedLink", this);
	m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
	return;
	}

	void RepeatedLink::updateModel()
	{
	unsigned int number_bits = getParameter("NumberBits").toUInt();

	// Get properties
	double wire_length = getProperty("WireLength").toDouble();
	double required_delay = getProperty("Delay").toDouble();
	bool isKeepParity = getProperty("IsKeepParity").toBool();

	ASSERT(wire_length >= 0, "[Error] " + getInstanceName() +
	" -> Wire length must be >= 0!");
	ASSERT(required_delay >= 0, "[Error] " + getInstanceName() +
	" -> Required delay must be >= 0!");

	const String& wire_layer = getParameter("WireLayer");
	double wire_width = getGenProperties()->get("WireWidth").toDouble();
	double wire_spacing = getGenProperties()->get("WireSpacing").toDouble();

	// Calculate the total wire cap and total wire res
	double wire_cap_per_len = getGenProperties()->get("WireCapacitancePerLength").toDouble();
	double wire_res_per_len = getGenProperties()->get("WireResistancePerLength").toDouble();
	double total_wire_cap = wire_cap_per_len * wire_length;
	double total_wire_res = wire_res_per_len * wire_length;

	m_repeater_->update();

	unsigned int increment_segments = (isKeepParity)? 2:1;
	unsigned int number_segments = increment_segments;
	double delay;
	m_repeater_->setMinDrivingStrength();
	m_repeater_->getNet("Y")->setDistributedCap(total_wire_cap / number_segments);
	m_repeater_->getNet("Y")->setDistributedRes(total_wire_res / number_segments);
	m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
	m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
	delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

	// If everything is 0, use number_segments min-sized repeater
	if(wire_length != 0)
	{
	// Set the initial number of segments based on isKeepParity
	double last_min_size_delay = 0;
	unsigned int iteration = 0;

	// First set the repeater to the minimum driving strength
	last_min_size_delay = delay;

	Log::printLine(getInstanceName() + " -> Beginning Repeater Insertion");

	while(required_delay < delay)
	{
	Log::printLine(getInstanceName() + " -> Repeater Insertion Iteration " + (String)iteration +
	": Required delay = " + (String)required_delay +
	", Delay = " + (String)delay +
	", Slack = " + (String)(required_delay - delay) +
	", Number of repeaters = " + (String)number_segments);

	// Size up if timing is not met
	while(required_delay < delay)
	{
	if(m_repeater_->hasMaxDrivingStrength())
	{
	break;
	}
	m_repeater_->increaseDrivingStrength();
	m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
	m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
	delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

	iteration++;
	Log::printLine(getInstanceName() + " -> Slack: " + (String)(required_delay - delay));
	}
	// Increase number of segments if timing is not met
	if(required_delay < delay)
	{
	number_segments += increment_segments;
	m_repeater_->setMinDrivingStrength();
	m_repeater_->getNet("Y")->setDistributedCap(total_wire_cap / number_segments);
	m_repeater_->getNet("Y")->setDistributedRes(total_wire_res / number_segments);
	m_repeater_load_->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
	m_timing_tree_->performCritPathExtract(m_repeater_->getNet("A"));
	delay = m_timing_tree_->calculateCritPathDelay(m_repeater_->getNet("A")) * number_segments;

	// Abort if adding more min sized repeaters does not decrease the delay
	if(delay > last_min_size_delay)
	{
	break;
	}
	last_min_size_delay = delay;
	}
	}
	Log::printLine(getInstanceName() + " -> Repeater Insertion Ended after Iteration: " + (String)iteration +
	": Required delay = " + (String)required_delay +
	", Delay = " + (String)delay +
	", Slack = " + (String)(required_delay - delay) +
	", Number of repeaters = " + (String)number_segments);

	// Print a warning if the timing is not met
	if(required_delay < delay)
	{
	const String& warning_msg = "[Warning] " + getInstanceName() + " -> Timing not met" +
	": Required delay = " + (String)required_delay +
	", Delay = " + (String)delay +
	", Slack = " + (String)(required_delay - delay) +
	", Number of repeaters = " + (String)number_segments;
	Log::printLine(std::cerr, warning_msg);
	}
	}

	// Update electrical interfaces
	getLoad("In_Cap")->setLoadCap(m_repeater_->getNet("A")->getTotalDownstreamCap());
	getDelay("In_to_Out_delay")->setDelay(delay);
	getDriver("Out_Ron")->setOutputRes(m_repeater_->getDriver("Y_Ron")->getOutputRes() + (total_wire_res / number_segments));

	getGenProperties()->set("NumberSegments", number_segments);

	// Update area, power results
	resetElectricalAtomicResults();
	addElecticalAtomicResultValues(m_repeater_, number_segments * number_bits);
	double wire_area = wire_length * (wire_width + wire_spacing) * number_bits;
	addElecticalWireAtomicResultValue(wire_layer, wire_area);

	return;
	}

	void RepeatedLink::useModel()
	{
	// Update the transition information for the modeled repeater
	// Since we only modeled one repeater. So the transition information for 0->0 and 1->1
	// is averaged out
	const TransitionInfo& trans_In = getInputPort("In")->getTransitionInfo();
	double average_static_transition = (trans_In.getNumberTransitions00() + trans_In.getNumberTransitions11()) / 2.0;
	TransitionInfo mod_trans_In(average_static_transition, trans_In.getNumberTransitions01(), average_static_transition);
	m_repeater_->getInputPort("A")->setTransitionInfo(mod_trans_In);
	m_repeater_->use();

	// Get parameters
	unsigned int number_bits = getParameter("NumberBits").toUInt();
	unsigned int number_segments = getGenProperties()->get("NumberSegments").toUInt();

	// Propagate the transition information
	propagateTransitionInfo();

	// Update leakage power
	double power = 0.0;
	power += m_repeater_->getNddPowerResult("Leakage")->calculateSum() * number_segments * number_bits;
	getNddPowerResult("Leakage")->setValue(power);

	// Update event result
	double energy = 0.0;
	energy += m_repeater_->getEventResult("INV")->calculateSum() * number_segments * number_bits;
	getEventResult("Send")->setValue(energy);

	return;
	}

	void RepeatedLink::propagateTransitionInfo()
	{
	unsigned int number_segments = getGenProperties()->get("NumberSegments");

	if((number_segments % 2) == 0)
	{
	propagatePortTransitionInfo("Out", "In");
	}
	else
	{
	const TransitionInfo& trans_In = getInputPort("In")->getTransitionInfo();
	TransitionInfo trans_Out(trans_In.getNumberTransitions11(), trans_In.getNumberTransitions01(), trans_In.getNumberTransitions00());
	getOutputPort("Out")->setTransitionInfo(trans_Out);
	}
	return;
	}

	} // namespace DSENT