ext/dsent/model/network/ElectricalMesh.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/network/ElectricalMesh.h"

 #include <cmath>

 #include "model/PortInfo.h"
 #include "model/EventInfo.h"
 #include "model/TransitionInfo.h"
 #include "model/ModelGen.h"
 #include "model/std_cells/StdCellLib.h"
 #include "model/timing_graph/ElectricalTimingTree.h"
 #include "model/timing_graph/ElectricalNet.h"

 namespace DSENT
 {
     using std::sqrt;

     ElectricalMesh::ElectricalMesh(const String& instance_name_, const TechModel* tech_model_)
         : ElectricalModel(instance_name_, tech_model_)
     {
         initParameters();
         initProperties();
     }

     ElectricalMesh::~ElectricalMesh()
     {}

     void ElectricalMesh::initParameters()
     {
         // Clock Frequency
         addParameterName("Frequency");
         // Physical Parameters
         addParameterName("NumberSites");
         addParameterName("NumberBitsPerFlit");
         // Concentration factor
         addParameterName("NumberSitesPerRouter");
         // Router parameters
         addParameterName("Router->NumberVirtualNetworks");
         addParameterName("Router->NumberVirtualChannelsPerVirtualNetwork");
         addParameterName("Router->NumberBuffersPerVirtualChannel");
         addParameterName("Router->InputPort->BufferModel");
         addParameterName("Router->CrossbarModel");
         addParameterName("Router->SwitchAllocator->ArbiterModel");
         addParameterName("Router->ClockTreeModel");
         addParameterName("Router->ClockTree->NumberLevels");
         addParameterName("Router->ClockTree->WireLayer");
         addParameterName("Router->ClockTree->WireWidthMultiplier");
         addParameterName("Router->ClockTree->WireSpacingMultiplier", 3.0);
         // Link parameters
         addParameterName("Link->WireLayer");
         addParameterName("Link->WireWidthMultiplier");
         addParameterName("Link->WireSpacingMultiplier");
         return;
     }

     void ElectricalMesh::initProperties()
     {
         addPropertyName("SitePitch");
         return;
     }

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

     void ElectricalMesh::constructModel()
     {
         // Get input paramters
         unsigned int number_sites = getParameter("NumberSites").toUInt();
         unsigned int number_bits_per_flit = getParameter("NumberBitsPerFlit").toUInt();
         unsigned int number_sites_per_router = getParameter("NumberSitesPerRouter").toUInt();

         ASSERT(number_sites > 0, "[Error] " + getInstanceName() +
                 " -> Number of sites must be > 0!");
         ASSERT(number_bits_per_flit > 0, "[Error] " + getInstanceName() +
                 " -> Number of bits per flit must be > 0!");
         ASSERT(number_sites_per_router > 0, "[Error] " + getInstanceName() +
                 " -> Number of sites per router must be > 0!");

         // Get input parameters that will be forwarded to the sub instances
         const String& router_number_vns = getParameter("Router->NumberVirtualNetworks");
         const String& router_number_vcs_per_vn = getParameter("Router->NumberVirtualChannelsPerVirtualNetwork");
         const String& router_number_bufs_per_vc = getParameter("Router->NumberBuffersPerVirtualChannel");
         const String& link_wire_layer = getParameter("Link->WireLayer");
         const String& link_wire_width_multiplier = getParameter("Link->WireWidthMultiplier");
         const String& link_wire_spacing_multiplier = getParameter("Link->WireSpacingMultiplier");

         // Calculate properties from input parameters
         unsigned int number_routers = number_sites / number_sites_per_router;
         unsigned int number_router_to_router_links = 4 * number_routers;
         unsigned int number_router_to_site_links = 2 * number_sites;
         unsigned int router_number_input_ports = 4 + number_sites_per_router;
         unsigned int router_number_output_ports = 4 + number_sites_per_router;

         getGenProperties()->set("NumberRouters", number_routers);
         getGenProperties()->set("NumberRouterToRouterLinks", number_router_to_router_links);
         getGenProperties()->set("NumberRouterToSiteLinks", number_router_to_site_links);
         getGenProperties()->set("Router->NumberInputPorts", router_number_input_ports);
         getGenProperties()->set("Router->NumberOutputPorts", router_number_output_ports);

         // Create ports
         createInputPort("CK");

         // Init mesh routers
         ElectricalModel* router = (ElectricalModel*)ModelGen::createModel("Router", "MeshRouter", getTechModel());
         router->setParameter("NumberInputPorts", router_number_input_ports);
         router->setParameter("NumberOutputPorts", router_number_output_ports);
         router->setParameter("NumberVirtualNetworks", router_number_vns);
         router->setParameter("NumberVirtualChannelsPerVirtualNetwork", router_number_vcs_per_vn);
         router->setParameter("NumberBuffersPerVirtualChannel", router_number_bufs_per_vc);
         router->setParameter("NumberBitsPerFlit", number_bits_per_flit);
         router->setParameter("InputPort->BufferModel", getParameter("Router->InputPort->BufferModel"));
         router->setParameter("CrossbarModel", getParameter("Router->CrossbarModel"));
         router->setParameter("SwitchAllocator->ArbiterModel", getParameter("Router->SwitchAllocator->ArbiterModel"));
         router->setParameter("ClockTreeModel", getParameter("Router->ClockTreeModel"));
         router->setParameter("ClockTree->NumberLevels", getParameter("Router->ClockTree->NumberLevels"));
         router->setParameter("ClockTree->WireLayer", getParameter("Router->ClockTree->WireLayer"));
         router->setParameter("ClockTree->WireWidthMultiplier", getParameter("Router->ClockTree->WireWidthMultiplier"));
         router->setParameter("ClockTree->WireSpacingMultiplier", getParameter("Router->ClockTree->WireSpacingMultiplier"));
         router->construct();

         // Init router to router links
         ElectricalModel* rr_link = (ElectricalModel*)ModelGen::createModel("RepeatedLink", "RouterToRouterLink", getTechModel());
         rr_link->setParameter("NumberBits", number_bits_per_flit);
         rr_link->setParameter("WireLayer", link_wire_layer);
         rr_link->setParameter("WireWidthMultiplier", link_wire_width_multiplier);
         rr_link->setParameter("WireSpacingMultiplier", link_wire_spacing_multiplier);
         rr_link->construct();

         // Init router to site links
         ElectricalModel* rs_link = (ElectricalModel*)ModelGen::createModel("RepeatedLink", "RouterToSiteLink", getTechModel());
         rs_link->setParameter("NumberBits", number_bits_per_flit);
         rs_link->setParameter("WireLayer", link_wire_layer);
         rs_link->setParameter("WireWidthMultiplier", link_wire_width_multiplier);
         rs_link->setParameter("WireSpacingMultiplier", link_wire_spacing_multiplier);
         rs_link->construct();

         // Connect ports
         createNet("RR_Link_Out", makeNetIndex(0, number_bits_per_flit-1));
         createNet("RR_Link_In", makeNetIndex(0, number_bits_per_flit-1));
         portConnect(rr_link, "In", "RR_Link_In");
         portConnect(rr_link, "Out", "RR_Link_Out");

         createNet("RS_Link_Out", makeNetIndex(0, number_bits_per_flit-1));
         createNet("RS_Link_In", makeNetIndex(0, number_bits_per_flit-1));
         portConnect(rs_link, "In", "RS_Link_In");
         portConnect(rs_link, "Out", "RS_Link_Out");

         portConnect(router, "CK", "CK");
         for(unsigned int i = 0; i < router_number_input_ports; ++i)
         {
             createNet("Router_In" + (String)i, makeNetIndex(0, number_bits_per_flit-1));
             portConnect(router, "FlitIn" + (String)i, "Router_In" + (String)i);
         }
         for(unsigned int i = 0; i < router_number_output_ports; ++i)
         {
             createNet("Router_Out" + (String)i, makeNetIndex(0, number_bits_per_flit-1));
             portConnect(router, "FlitOut" + (String)i, "Router_Out" + (String)i);
         }
         for(unsigned int i = 0; i < number_bits_per_flit; ++i)
         {
             for(unsigned int j = 0; j < 4; ++j)
             {
                 assignVirtualFanout("Router_In" + (String)j, makeNetIndex(i), "RR_Link_Out", makeNetIndex(i));
                 assignVirtualFanin("RR_Link_In", makeNetIndex(i), "Router_Out" + (String)j, makeNetIndex(i));
             }
             for(unsigned int j = 4; j < router_number_input_ports; ++j)
             {
                 assignVirtualFanout("Router_In" + (String)j, makeNetIndex(i), "RS_Link_Out", makeNetIndex(i));
                 assignVirtualFanin("RS_Link_In", makeNetIndex(i), "Router_Out" + (String)j, makeNetIndex(i));
             }
         }

         // Create area, power and event results
         createElectricalResults();
         createElectricalEventResult("AvgUnicast");
         createElectricalEventResult("AvgBroadcast");

         // Add all instances
         addSubInstances(router, number_routers);
         addElectricalSubResults(router, number_routers);
         addSubInstances(rr_link, number_router_to_router_links);
         addElectricalSubResults(rr_link, number_router_to_router_links);
         addSubInstances(rs_link, number_router_to_site_links);
         addElectricalSubResults(rs_link, number_router_to_site_links);

         double number_routers_per_side = sqrt(number_routers);

         // Update unicast event
         double avg_number_unicast_hop = 2.0 * number_routers_per_side / 3.0;
         double avg_number_unicast_rr_links_traveled = avg_number_unicast_hop;
         double avg_number_unicast_rs_links_traveled = 2.0;
         double avg_number_unicast_router_traveled = avg_number_unicast_hop + 1.0;
         Result* avg_unicast_flit = getEventResult("AvgUnicast");
         avg_unicast_flit->addSubResult(rr_link->getEventResult("Send"), "RouterToRouterLink", avg_number_unicast_rr_links_traveled);
         avg_unicast_flit->addSubResult(rs_link->getEventResult("Send"), "RouterToSiteLink", avg_number_unicast_rs_links_traveled);
         if(router->hasEventResult("WriteBuffer"))
         {
             avg_unicast_flit->addSubResult(router->getEventResult("WriteBuffer"), "MeshRouter", avg_number_unicast_router_traveled);
         }
         if(router->hasEventResult("ReadBuffer"))
         {
             avg_unicast_flit->addSubResult(router->getEventResult("ReadBuffer"), "MeshRouter", avg_number_unicast_router_traveled);
         }
         avg_unicast_flit->addSubResult(router->getEventResult("TraverseCrossbar->Multicast1"), "MeshRouter", avg_number_unicast_router_traveled);

         // Update broadcast event
         double avg_number_broadcast_rr_links_traveled = (number_routers_per_side - 1.0) * number_routers_per_side + number_routers_per_side - 1.0;
         double avg_number_broadcast_rs_links_traveled = number_sites;
         double avg_number_broadcast_router_crossbar_traveled = number_routers * (number_sites_per_router + 1.0) - 2.0;
         Result* avg_broadcast_flit = getEventResult("AvgBroadcast");
         avg_broadcast_flit->addSubResult(rr_link->getEventResult("Send"), "RouterToRouterLink", avg_number_broadcast_rr_links_traveled);
         avg_broadcast_flit->addSubResult(rs_link->getEventResult("Send"), "RouterToSiteLink", avg_number_broadcast_rs_links_traveled);
         if(router->hasEventResult("WriteBuffer"))
         {
             avg_broadcast_flit->addSubResult(router->getEventResult("WriteBuffer"), "MeshRouter", number_routers);
         }
         if(router->hasEventResult("ReadBuffer"))
         {
             avg_broadcast_flit->addSubResult(router->getEventResult("ReadBuffer"), "MeshRouter", number_routers);
         }
         avg_broadcast_flit->addSubResult(router->getEventResult("TraverseCrossbar->Multicast1"), "MeshRouter", avg_number_broadcast_router_crossbar_traveled);

         return;
     }

     void ElectricalMesh::updateModel()
     {
         // Get properties
         double site_pitch = getProperty("SitePitch").toDouble();
         double clock_freq = getParameter("Frequency");

         ASSERT(site_pitch > 0, "[Error] " + getInstanceName() +
                 " -> Site pitch must be > 0!");
         ASSERT(clock_freq > 0, "[Error] " + getInstanceName() +
                 " -> Clock frequency must be > 0!");

         unsigned int number_sites_per_router = getParameter("NumberSitesPerRouter");
         // Get margin on link delays, since there are registers before and after the link
         double delay_ck_to_q = getTechModel()->getStdCellLib()->getStdCellCache()->get("DFFQ_X1->Delay->CK_to_Q");
         double delay_setup = getTechModel()->getStdCellLib()->getStdCellCache()->get("DFFQ_X1->Delay->CK_to_Q");
         double link_delay_margin = (delay_ck_to_q + delay_setup) * 1.5;

         double rr_link_length = site_pitch * sqrt(number_sites_per_router);
         double rr_link_delay = std::max(1e-99, 1.0 / clock_freq - link_delay_margin);
         double rs_link_length = site_pitch * (sqrt(number_sites_per_router) - 1.0);
         double rs_link_delay = std::max(1e-99, 1.0 / clock_freq - link_delay_margin );
         double router_delay = 1.0 / clock_freq;

         Model* rr_link = getSubInstance("RouterToRouterLink");
         rr_link->setProperty("WireLength", rr_link_length);
         rr_link->setProperty("Delay", rr_link_delay);
         rr_link->setProperty("IsKeepParity", "TRUE");
         rr_link->update();

         Model* rs_link = getSubInstance("RouterToSiteLink");
         rs_link->setProperty("WireLength", rs_link_length);
         rs_link->setProperty("Delay", rs_link_delay);
         rs_link->setProperty("IsKeepParity", "TRUE");
         rs_link->update();

         ElectricalModel* router = (ElectricalModel*)getSubInstance("MeshRouter");
         router->update();

         ElectricalTimingTree router_timing_tree("MeshRouter", router);
         router_timing_tree.performTimingOpt(router->getNet("CK"), router_delay);
         return;
     }

     void ElectricalMesh::propagateTransitionInfo()
     {
         // Get parameters
         unsigned int router_number_input_ports = getGenProperties()->get("Router->NumberInputPorts");

         ElectricalModel* rr_link = (ElectricalModel*)getSubInstance("RouterToRouterLink");
         assignPortTransitionInfo(rr_link, "In", TransitionInfo(0.25, 0.25, 0.25));
         rr_link->use();

         ElectricalModel* rs_link = (ElectricalModel*)getSubInstance("RouterToSiteLink");
         assignPortTransitionInfo(rs_link, "In", TransitionInfo(0.25, 0.25, 0.25));
         rs_link->use();

         ElectricalModel* router = (ElectricalModel*)getSubInstance("MeshRouter");
         for(unsigned int i = 0; i < router_number_input_ports; ++i)
         {
             assignPortTransitionInfo(router, "FlitIn" + (String)i, TransitionInfo(0.25, 0.25, 0.25));
         }
         assignPortTransitionInfo(router, "CK", TransitionInfo(0.0, 1.0, 0.0));
         router->getGenProperties()->set("UseModelEvent", "");
         router->use();

         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/network/ElectricalMesh.h"

	#include <cmath>

	#include "model/PortInfo.h"
	#include "model/EventInfo.h"
	#include "model/TransitionInfo.h"
	#include "model/ModelGen.h"
	#include "model/std_cells/StdCellLib.h"
	#include "model/timing_graph/ElectricalTimingTree.h"
	#include "model/timing_graph/ElectricalNet.h"

	namespace DSENT
	{
	using std::sqrt;

	ElectricalMesh::ElectricalMesh(const String& instance_name_, const TechModel* tech_model_)
	: ElectricalModel(instance_name_, tech_model_)
	{
	initParameters();
	initProperties();
	}

	ElectricalMesh::~ElectricalMesh()
	{}

	void ElectricalMesh::initParameters()
	{
	// Clock Frequency
	addParameterName("Frequency");
	// Physical Parameters
	addParameterName("NumberSites");
	addParameterName("NumberBitsPerFlit");
	// Concentration factor
	addParameterName("NumberSitesPerRouter");
	// Router parameters
	addParameterName("Router->NumberVirtualNetworks");
	addParameterName("Router->NumberVirtualChannelsPerVirtualNetwork");
	addParameterName("Router->NumberBuffersPerVirtualChannel");
	addParameterName("Router->InputPort->BufferModel");
	addParameterName("Router->CrossbarModel");
	addParameterName("Router->SwitchAllocator->ArbiterModel");
	addParameterName("Router->ClockTreeModel");
	addParameterName("Router->ClockTree->NumberLevels");
	addParameterName("Router->ClockTree->WireLayer");
	addParameterName("Router->ClockTree->WireWidthMultiplier");
	addParameterName("Router->ClockTree->WireSpacingMultiplier", 3.0);
	// Link parameters
	addParameterName("Link->WireLayer");
	addParameterName("Link->WireWidthMultiplier");
	addParameterName("Link->WireSpacingMultiplier");
	return;
	}

	void ElectricalMesh::initProperties()
	{
	addPropertyName("SitePitch");
	return;
	}

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

	void ElectricalMesh::constructModel()
	{
	// Get input paramters
	unsigned int number_sites = getParameter("NumberSites").toUInt();
	unsigned int number_bits_per_flit = getParameter("NumberBitsPerFlit").toUInt();
	unsigned int number_sites_per_router = getParameter("NumberSitesPerRouter").toUInt();

	ASSERT(number_sites > 0, "[Error] " + getInstanceName() +
	" -> Number of sites must be > 0!");
	ASSERT(number_bits_per_flit > 0, "[Error] " + getInstanceName() +
	" -> Number of bits per flit must be > 0!");
	ASSERT(number_sites_per_router > 0, "[Error] " + getInstanceName() +
	" -> Number of sites per router must be > 0!");

	// Get input parameters that will be forwarded to the sub instances
	const String& router_number_vns = getParameter("Router->NumberVirtualNetworks");
	const String& router_number_vcs_per_vn = getParameter("Router->NumberVirtualChannelsPerVirtualNetwork");
	const String& router_number_bufs_per_vc = getParameter("Router->NumberBuffersPerVirtualChannel");
	const String& link_wire_layer = getParameter("Link->WireLayer");
	const String& link_wire_width_multiplier = getParameter("Link->WireWidthMultiplier");
	const String& link_wire_spacing_multiplier = getParameter("Link->WireSpacingMultiplier");

	// Calculate properties from input parameters
	unsigned int number_routers = number_sites / number_sites_per_router;
	unsigned int number_router_to_router_links = 4 * number_routers;
	unsigned int number_router_to_site_links = 2 * number_sites;
	unsigned int router_number_input_ports = 4 + number_sites_per_router;
	unsigned int router_number_output_ports = 4 + number_sites_per_router;

	getGenProperties()->set("NumberRouters", number_routers);
	getGenProperties()->set("NumberRouterToRouterLinks", number_router_to_router_links);
	getGenProperties()->set("NumberRouterToSiteLinks", number_router_to_site_links);
	getGenProperties()->set("Router->NumberInputPorts", router_number_input_ports);
	getGenProperties()->set("Router->NumberOutputPorts", router_number_output_ports);

	// Create ports
	createInputPort("CK");

	// Init mesh routers
	ElectricalModel* router = (ElectricalModel*)ModelGen::createModel("Router", "MeshRouter", getTechModel());
	router->setParameter("NumberInputPorts", router_number_input_ports);
	router->setParameter("NumberOutputPorts", router_number_output_ports);
	router->setParameter("NumberVirtualNetworks", router_number_vns);
	router->setParameter("NumberVirtualChannelsPerVirtualNetwork", router_number_vcs_per_vn);
	router->setParameter("NumberBuffersPerVirtualChannel", router_number_bufs_per_vc);
	router->setParameter("NumberBitsPerFlit", number_bits_per_flit);
	router->setParameter("InputPort->BufferModel", getParameter("Router->InputPort->BufferModel"));
	router->setParameter("CrossbarModel", getParameter("Router->CrossbarModel"));
	router->setParameter("SwitchAllocator->ArbiterModel", getParameter("Router->SwitchAllocator->ArbiterModel"));
	router->setParameter("ClockTreeModel", getParameter("Router->ClockTreeModel"));
	router->setParameter("ClockTree->NumberLevels", getParameter("Router->ClockTree->NumberLevels"));
	router->setParameter("ClockTree->WireLayer", getParameter("Router->ClockTree->WireLayer"));
	router->setParameter("ClockTree->WireWidthMultiplier", getParameter("Router->ClockTree->WireWidthMultiplier"));
	router->setParameter("ClockTree->WireSpacingMultiplier", getParameter("Router->ClockTree->WireSpacingMultiplier"));
	router->construct();

	// Init router to router links
	ElectricalModel* rr_link = (ElectricalModel*)ModelGen::createModel("RepeatedLink", "RouterToRouterLink", getTechModel());
	rr_link->setParameter("NumberBits", number_bits_per_flit);
	rr_link->setParameter("WireLayer", link_wire_layer);
	rr_link->setParameter("WireWidthMultiplier", link_wire_width_multiplier);
	rr_link->setParameter("WireSpacingMultiplier", link_wire_spacing_multiplier);
	rr_link->construct();

	// Init router to site links
	ElectricalModel* rs_link = (ElectricalModel*)ModelGen::createModel("RepeatedLink", "RouterToSiteLink", getTechModel());
	rs_link->setParameter("NumberBits", number_bits_per_flit);
	rs_link->setParameter("WireLayer", link_wire_layer);
	rs_link->setParameter("WireWidthMultiplier", link_wire_width_multiplier);
	rs_link->setParameter("WireSpacingMultiplier", link_wire_spacing_multiplier);
	rs_link->construct();

	// Connect ports
	createNet("RR_Link_Out", makeNetIndex(0, number_bits_per_flit-1));
	createNet("RR_Link_In", makeNetIndex(0, number_bits_per_flit-1));
	portConnect(rr_link, "In", "RR_Link_In");
	portConnect(rr_link, "Out", "RR_Link_Out");

	createNet("RS_Link_Out", makeNetIndex(0, number_bits_per_flit-1));
	createNet("RS_Link_In", makeNetIndex(0, number_bits_per_flit-1));
	portConnect(rs_link, "In", "RS_Link_In");
	portConnect(rs_link, "Out", "RS_Link_Out");

	portConnect(router, "CK", "CK");
	for(unsigned int i = 0; i < router_number_input_ports; ++i)
	{
	createNet("Router_In" + (String)i, makeNetIndex(0, number_bits_per_flit-1));
	portConnect(router, "FlitIn" + (String)i, "Router_In" + (String)i);
	}
	for(unsigned int i = 0; i < router_number_output_ports; ++i)
	{
	createNet("Router_Out" + (String)i, makeNetIndex(0, number_bits_per_flit-1));
	portConnect(router, "FlitOut" + (String)i, "Router_Out" + (String)i);
	}
	for(unsigned int i = 0; i < number_bits_per_flit; ++i)
	{
	for(unsigned int j = 0; j < 4; ++j)
	{
	assignVirtualFanout("Router_In" + (String)j, makeNetIndex(i), "RR_Link_Out", makeNetIndex(i));
	assignVirtualFanin("RR_Link_In", makeNetIndex(i), "Router_Out" + (String)j, makeNetIndex(i));
	}
	for(unsigned int j = 4; j < router_number_input_ports; ++j)
	{
	assignVirtualFanout("Router_In" + (String)j, makeNetIndex(i), "RS_Link_Out", makeNetIndex(i));
	assignVirtualFanin("RS_Link_In", makeNetIndex(i), "Router_Out" + (String)j, makeNetIndex(i));
	}
	}

	// Create area, power and event results
	createElectricalResults();
	createElectricalEventResult("AvgUnicast");
	createElectricalEventResult("AvgBroadcast");

	// Add all instances
	addSubInstances(router, number_routers);
	addElectricalSubResults(router, number_routers);
	addSubInstances(rr_link, number_router_to_router_links);
	addElectricalSubResults(rr_link, number_router_to_router_links);
	addSubInstances(rs_link, number_router_to_site_links);
	addElectricalSubResults(rs_link, number_router_to_site_links);

	double number_routers_per_side = sqrt(number_routers);

	// Update unicast event
	double avg_number_unicast_hop = 2.0 * number_routers_per_side / 3.0;
	double avg_number_unicast_rr_links_traveled = avg_number_unicast_hop;
	double avg_number_unicast_rs_links_traveled = 2.0;
	double avg_number_unicast_router_traveled = avg_number_unicast_hop + 1.0;
	Result* avg_unicast_flit = getEventResult("AvgUnicast");
	avg_unicast_flit->addSubResult(rr_link->getEventResult("Send"), "RouterToRouterLink", avg_number_unicast_rr_links_traveled);
	avg_unicast_flit->addSubResult(rs_link->getEventResult("Send"), "RouterToSiteLink", avg_number_unicast_rs_links_traveled);
	if(router->hasEventResult("WriteBuffer"))
	{
	avg_unicast_flit->addSubResult(router->getEventResult("WriteBuffer"), "MeshRouter", avg_number_unicast_router_traveled);
	}
	if(router->hasEventResult("ReadBuffer"))
	{
	avg_unicast_flit->addSubResult(router->getEventResult("ReadBuffer"), "MeshRouter", avg_number_unicast_router_traveled);
	}
	avg_unicast_flit->addSubResult(router->getEventResult("TraverseCrossbar->Multicast1"), "MeshRouter", avg_number_unicast_router_traveled);

	// Update broadcast event
	double avg_number_broadcast_rr_links_traveled = (number_routers_per_side - 1.0) * number_routers_per_side + number_routers_per_side - 1.0;
	double avg_number_broadcast_rs_links_traveled = number_sites;
	double avg_number_broadcast_router_crossbar_traveled = number_routers * (number_sites_per_router + 1.0) - 2.0;
	Result* avg_broadcast_flit = getEventResult("AvgBroadcast");
	avg_broadcast_flit->addSubResult(rr_link->getEventResult("Send"), "RouterToRouterLink", avg_number_broadcast_rr_links_traveled);
	avg_broadcast_flit->addSubResult(rs_link->getEventResult("Send"), "RouterToSiteLink", avg_number_broadcast_rs_links_traveled);
	if(router->hasEventResult("WriteBuffer"))
	{
	avg_broadcast_flit->addSubResult(router->getEventResult("WriteBuffer"), "MeshRouter", number_routers);
	}
	if(router->hasEventResult("ReadBuffer"))
	{
	avg_broadcast_flit->addSubResult(router->getEventResult("ReadBuffer"), "MeshRouter", number_routers);
	}
	avg_broadcast_flit->addSubResult(router->getEventResult("TraverseCrossbar->Multicast1"), "MeshRouter", avg_number_broadcast_router_crossbar_traveled);

	return;
	}

	void ElectricalMesh::updateModel()
	{
	// Get properties
	double site_pitch = getProperty("SitePitch").toDouble();
	double clock_freq = getParameter("Frequency");

	ASSERT(site_pitch > 0, "[Error] " + getInstanceName() +
	" -> Site pitch must be > 0!");
	ASSERT(clock_freq > 0, "[Error] " + getInstanceName() +
	" -> Clock frequency must be > 0!");

	unsigned int number_sites_per_router = getParameter("NumberSitesPerRouter");
	// Get margin on link delays, since there are registers before and after the link
	double delay_ck_to_q = getTechModel()->getStdCellLib()->getStdCellCache()->get("DFFQ_X1->Delay->CK_to_Q");
	double delay_setup = getTechModel()->getStdCellLib()->getStdCellCache()->get("DFFQ_X1->Delay->CK_to_Q");
	double link_delay_margin = (delay_ck_to_q + delay_setup) * 1.5;

	double rr_link_length = site_pitch * sqrt(number_sites_per_router);
	double rr_link_delay = std::max(1e-99, 1.0 / clock_freq - link_delay_margin);
	double rs_link_length = site_pitch * (sqrt(number_sites_per_router) - 1.0);
	double rs_link_delay = std::max(1e-99, 1.0 / clock_freq - link_delay_margin );
	double router_delay = 1.0 / clock_freq;

	Model* rr_link = getSubInstance("RouterToRouterLink");
	rr_link->setProperty("WireLength", rr_link_length);
	rr_link->setProperty("Delay", rr_link_delay);
	rr_link->setProperty("IsKeepParity", "TRUE");
	rr_link->update();

	Model* rs_link = getSubInstance("RouterToSiteLink");
	rs_link->setProperty("WireLength", rs_link_length);
	rs_link->setProperty("Delay", rs_link_delay);
	rs_link->setProperty("IsKeepParity", "TRUE");
	rs_link->update();

	ElectricalModel* router = (ElectricalModel*)getSubInstance("MeshRouter");
	router->update();

	ElectricalTimingTree router_timing_tree("MeshRouter", router);
	router_timing_tree.performTimingOpt(router->getNet("CK"), router_delay);
	return;
	}

	void ElectricalMesh::propagateTransitionInfo()
	{
	// Get parameters
	unsigned int router_number_input_ports = getGenProperties()->get("Router->NumberInputPorts");

	ElectricalModel* rr_link = (ElectricalModel*)getSubInstance("RouterToRouterLink");
	assignPortTransitionInfo(rr_link, "In", TransitionInfo(0.25, 0.25, 0.25));
	rr_link->use();

	ElectricalModel* rs_link = (ElectricalModel*)getSubInstance("RouterToSiteLink");
	assignPortTransitionInfo(rs_link, "In", TransitionInfo(0.25, 0.25, 0.25));
	rs_link->use();

	ElectricalModel* router = (ElectricalModel*)getSubInstance("MeshRouter");
	for(unsigned int i = 0; i < router_number_input_ports; ++i)
	{
	assignPortTransitionInfo(router, "FlitIn" + (String)i, TransitionInfo(0.25, 0.25, 0.25));
	}
	assignPortTransitionInfo(router, "CK", TransitionInfo(0.0, 1.0, 0.0));
	router->getGenProperties()->set("UseModelEvent", "");
	router->use();

	return;
	}
	} // namespace DSENT