e8ed7b1d1b
This patch adds a tool called DSENT to the ext/ directory. DSENT is a tool that models power and area for on-chip networks. The next patch adds a script for using the tool.
219 lines
8.3 KiB
C++
219 lines
8.3 KiB
C++
#include "model/std_cells/INV.h"
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#include <cmath>
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#include "model/PortInfo.h"
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#include "model/TransitionInfo.h"
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#include "model/EventInfo.h"
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#include "model/std_cells/CellMacros.h"
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#include "model/std_cells/StdCellLib.h"
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#include "model/timing_graph/ElectricalNet.h"
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#include "model/timing_graph/ElectricalDriver.h"
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#include "model/timing_graph/ElectricalLoad.h"
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#include "model/timing_graph/ElectricalDelay.h"
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namespace DSENT
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{
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using std::ceil;
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using std::max;
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INV::INV(const String& instance_name_, const TechModel* tech_model_)
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: StdCell(instance_name_, tech_model_)
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{
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initProperties();
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}
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INV::~INV()
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{}
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void INV::initProperties()
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{
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return;
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}
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void INV::constructModel()
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{
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// All constructModel should do is create Area/NDDPower/Energy Results as
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// well as instantiate any sub-instances using only the hard parameters
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// Build Electrical Connectivity
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createInputPort("A");
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createOutputPort("Y");
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createLoad("A_Cap");
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createDelay("A_to_Y_delay");
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createDriver("Y_Ron", true);
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ElectricalLoad* a_cap = getLoad("A_Cap");
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ElectricalDelay* a_to_y_delay = getDelay("A_to_Y_delay");
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ElectricalDriver* y_ron = getDriver("Y_Ron");
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getNet("A")->addDownstreamNode(a_cap);
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a_cap->addDownstreamNode(a_to_y_delay);
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a_to_y_delay->addDownstreamNode(y_ron);
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y_ron->addDownstreamNode(getNet("Y"));
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// Create Area result
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// Create NDD Power result
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createElectricalAtomicResults();
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// Create INV Event Energy Result
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createElectricalEventAtomicResult("INV");
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getEventInfo("Idle")->setStaticTransitionInfos();
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return;
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}
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void INV::updateModel()
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{
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// All updateModel should do is calculate numbers for the Area/NDDPower/Energy
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// Results as anything else that needs to be done using either soft or hard parameters
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// Get parameters
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double drive_strength = getDrivingStrength();
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Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();
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// Standard cell cache string
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String cell_name = "INV_X" + (String) drive_strength;
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// Get timing parameters
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getLoad("A_Cap")->setLoadCap(cache->get(cell_name + "->Cap->A"));
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getDriver("Y_Ron")->setOutputRes(cache->get(cell_name + "->DriveRes->Y"));
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getDelay("A_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->A_to_Y"));
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// Set the cell area
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getAreaResult("Active")->setValue(cache->get(cell_name + "->Area->Active"));
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getAreaResult("Metal1Wire")->setValue(cache->get(cell_name + "->Area->Metal1Wire"));
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return;
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}
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void INV::evaluateModel()
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{
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return;
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}
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void INV::useModel()
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{
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// Get parameters
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double drive_strength = getDrivingStrength();
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Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();
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// Standard cell cache string
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String cell_name = "INV_X" + (String) drive_strength;
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// Propagate the transition info and get the 0->1 transtion count
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propagateTransitionInfo();
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double P_A = getInputPort("A")->getTransitionInfo().getProbability1();
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double Y_num_trans_01 = getOutputPort("Y")->getTransitionInfo().getNumberTransitions01();
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// Calculate leakage
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double leakage = 0;
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leakage += cache->get(cell_name + "->Leakage->!A") * (1 - P_A);
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leakage += cache->get(cell_name + "->Leakage->A") * P_A;
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getNddPowerResult("Leakage")->setValue(leakage);
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// Get VDD
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double vdd = getTechModel()->get("Vdd");
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// Get capacitances
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//double a_cap = cache->get(cell_name + "->Cap->A");
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double y_cap = cache->get(cell_name + "->Cap->Y");
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double y_load_cap = getNet("Y")->getTotalDownstreamCap();
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// Calculate INV Event energy
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double energy_per_trans_01 = (y_cap + y_load_cap) * vdd * vdd;
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getEventResult("INV")->setValue(energy_per_trans_01 * Y_num_trans_01);
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return;
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}
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void INV::propagateTransitionInfo()
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{
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// Get input transition info
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const TransitionInfo& trans_A = getInputPort("A")->getTransitionInfo();
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// Set output transition info
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double Y_num_trans_00 = trans_A.getNumberTransitions11();
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double Y_num_trans_01 = trans_A.getNumberTransitions01();
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double Y_num_trans_11 = trans_A.getNumberTransitions00();
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TransitionInfo trans_Y(Y_num_trans_00, Y_num_trans_01, Y_num_trans_11);
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getOutputPort("Y")->setTransitionInfo(trans_Y);
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return;
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}
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// Creates the standard cell, characterizes and abstracts away the details
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void INV::cacheStdCell(StdCellLib* cell_lib_, double drive_strength_)
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{
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// Standard cell cache string
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String cell_name = "INV_X" + (String) drive_strength_;
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Log::printLine("=== " + cell_name + " ===");
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// Get parameters
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double gate_pitch = cell_lib_->getTechModel()->get("Gate->PitchContacted");
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Map<double>* cache = cell_lib_->getStdCellCache();
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// Now actually build the full standard cell model
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// Create the two input ports
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createInputPort("A");
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createOutputPort("Y");
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// Adds macros
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CellMacros::addInverter(this, "INV", true, true, "A", "Y");
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CellMacros::updateInverter(this, "INV", drive_strength_);
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// Cache area result
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double area = gate_pitch * getTotalHeight() * (1 + getGenProperties()->get("INV_GatePitches").toDouble());
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cache->set(cell_name + "->Area->Active", area);
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cache->set(cell_name + "->Area->Metal1Wire", area);
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Log::printLine(cell_name + "->Area->Active=" + (String) area);
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Log::printLine(cell_name + "->Area->Metal1Wire=" + (String) area);
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// --------------------------------------------------------------------
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// Leakage Model Calculation
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// --------------------------------------------------------------------
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double leakage_a0 = getGenProperties()->get("INV_LeakagePower_0").toDouble();
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double leakage_a1 = getGenProperties()->get("INV_LeakagePower_1").toDouble();
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cache->set(cell_name + "->Leakage->!A", leakage_a0);
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cache->set(cell_name + "->Leakage->A", leakage_a1);
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Log::printLine(cell_name + "->Leakage->!A=" + (String) leakage_a0);
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Log::printLine(cell_name + "->Leakage->A=" + (String) leakage_a1);
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// --------------------------------------------------------------------
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/*
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// Cache event energy results
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double event_a_flip = getGenProperties()->get("INV_A_Flip").toDouble() + getGenProperties()->get("INV_ZN_Flip").toDouble();
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cache->set(cell_name + "->Event_A_Flip", event_a_flip);
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Log::printLine(cell_name + "->Event_A_Flip=" + (String) event_a_flip);
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*/
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// --------------------------------------------------------------------
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// Get Node Capacitances
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// --------------------------------------------------------------------
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double a_cap = getNet("A")->getTotalDownstreamCap();
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double y_cap = getNet("Y")->getTotalDownstreamCap();
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cache->set(cell_name + "->Cap->A", a_cap);
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cache->set(cell_name + "->Cap->Y", y_cap);
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Log::printLine(cell_name + "->Cap->A=" + (String) a_cap);
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Log::printLine(cell_name + "->Cap->Y=" + (String) y_cap);
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// --------------------------------------------------------------------
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// --------------------------------------------------------------------
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// Build Internal Delay Model
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// --------------------------------------------------------------------
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double y_ron = getDriver("INV_RonZN")->getOutputRes();
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double a_to_y_delay = getDriver("INV_RonZN")->calculateDelay();
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cache->set(cell_name + "->DriveRes->Y", y_ron);
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cache->set(cell_name + "->Delay->A_to_Y", a_to_y_delay);
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Log::printLine(cell_name + "->DriveRes->Y=" + (String) y_ron);
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Log::printLine(cell_name + "->Delay->A_to_Y=" + (String) a_to_y_delay);
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// --------------------------------------------------------------------
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return;
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}
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} // namespace DSENT
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