BUF.cc revision 10447 
1#include "model/std_cells/BUF.h"
2
3#include <cmath>
4
5#include "model/PortInfo.h"
6#include "model/TransitionInfo.h"
7#include "model/EventInfo.h"
8#include "model/std_cells/StdCellLib.h"
9#include "model/std_cells/CellMacros.h"
10#include "model/timing_graph/ElectricalNet.h"
11#include "model/timing_graph/ElectricalDriver.h"
12#include "model/timing_graph/ElectricalLoad.h"
13#include "model/timing_graph/ElectricalDelay.h"
14
15namespace DSENT
16{
17    using std::max;
18
19    BUF::BUF(const String& instance_name_, const TechModel* tech_model_)
20        : StdCell(instance_name_, tech_model_)
21    {
22        initProperties();
23    }
24
25    BUF::~BUF()
26    {}
27
28    void BUF::initProperties()
29    {
30        return;
31    }
32
33    void BUF::constructModel()
34    {
35        createInputPort("A");
36        createOutputPort("Y");
37
38        createLoad("A_Cap");
39        createDelay("A_to_Y_delay");
40        createDriver("Y_Ron", true);
41
42        ElectricalLoad* a_cap = getLoad("A_Cap");
43        ElectricalDelay* a_to_y_delay = getDelay("A_to_Y_delay");
44        ElectricalDriver* y_ron = getDriver("Y_Ron");
45
46        getNet("A")->addDownstreamNode(a_cap);
47        a_cap->addDownstreamNode(a_to_y_delay);
48        a_to_y_delay->addDownstreamNode(y_ron);
49        y_ron->addDownstreamNode(getNet("Y"));
50
51        // Create Area result
52        // Create NDD Power result
53        createElectricalAtomicResults();
54        // Create OR Event Energy Result
55        createElectricalEventAtomicResult("BUF");
56
57        getEventInfo("Idle")->setStaticTransitionInfos();
58
59        return;
60    }
61
62    void BUF::updateModel()
63    {
64        // Get parameters
65        double drive_strength = getDrivingStrength();
66        Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();
67
68        // Standard cell cache string
69        const String& cell_name = "BUF_X" + (String) drive_strength;
70
71        // Get timing parameters
72        getLoad("A_Cap")->setLoadCap(cache->get(cell_name + "->Cap->A"));
73        getDelay("A_to_Y_delay")->setDelay(cache->get(cell_name + "->Delay->A_to_Y"));
74        getDriver("Y_Ron")->setOutputRes(cache->get(cell_name + "->DriveRes->Y"));
75
76        // Set the cell area
77        getAreaResult("Active")->setValue(cache->get(cell_name + "->ActiveArea"));
78        getAreaResult("Metal1Wire")->setValue(cache->get(cell_name + "->ActiveArea"));
79
80        return;
81    }
82
83    void BUF::evaluateModel()
84    {
85        return;
86    }
87
88    void BUF::useModel()
89    {
90        // Get parameters
91        double drive_strength = getDrivingStrength();
92        Map<double>* cache = getTechModel()->getStdCellLib()->getStdCellCache();
93
94        // Stadard cell cache string
95        const String& cell_name = "BUF_X" + (String) drive_strength;
96
97        // Propagate the transition info and get the 0->1 transtion count
98        propagateTransitionInfo();
99        double P_A = getInputPort("A")->getTransitionInfo().getProbability1();
100        double Y_num_trans_01 = getOutputPort("Y")->getTransitionInfo().getNumberTransitions01();
101
102        // Calculate leakage
103        double leakage = 0;
104        leakage += cache->get(cell_name + "->Leakage->!A") * (1 - P_A);
105        leakage += cache->get(cell_name + "->Leakage->A") * P_A;
106        getNddPowerResult("Leakage")->setValue(leakage);
107
108        // Get VDD
109        double vdd = getTechModel()->get("Vdd");
110
111        // Get capacitances
112        double y_b_cap = cache->get(cell_name + "->Cap->Y_b");
113        double y_cap = cache->get(cell_name + "->Cap->Y");
114        double y_load_cap = getNet("Y")->getTotalDownstreamCap();
115
116        // Calculate BUFEvent energy
117        double energy_per_trans_01 = (y_b_cap + y_cap + y_load_cap) * vdd * vdd;
118        getEventResult("BUF")->setValue(energy_per_trans_01 * Y_num_trans_01);
119
120        return;
121    }
122
123    void BUF::propagateTransitionInfo()
124    {
125        // Get input signal transition info
126        const TransitionInfo& trans_A = getInputPort("A")->getTransitionInfo();
127
128        getOutputPort("Y")->setTransitionInfo(trans_A);
129        return;
130    }
131
132    // Creates the standard cell, characterizes and abstracts away the details
133    void BUF::cacheStdCell(StdCellLib* cell_lib_, double drive_strength_)
134    {
135        // Get parameters
136        double gate_pitch = cell_lib_->getTechModel()->get("Gate->PitchContacted");
137        Map<double>* cache = cell_lib_->getStdCellCache();
138
139        // Stadard cell cache string
140        const String& cell_name = "BUF_X" + (String) drive_strength_;
141
142        Log::printLine("=== " + cell_name + " ===");
143
144        // Now actually build the full standard cell model
145        createInputPort("A");
146        createOutputPort("Y");
147
148        createNet("Y_b");
149
150        // Adds macros
151        CellMacros::addInverter(this, "INV0", false, true, "A", "Y_b");
152        CellMacros::addInverter(this, "INV1", false, true, "Y_b", "Y");
153
154        // Update macros
155        CellMacros::updateInverter(this, "INV0", drive_strength_ * 0.367);
156        CellMacros::updateInverter(this, "INV1", drive_strength_ * 1.0);
157
158        // Cache area result
159        double area = 0.0;
160        area += gate_pitch * getTotalHeight() * 1;
161        area += gate_pitch * getTotalHeight() * getGenProperties()->get("INV0_GatePitches").toDouble();
162        area += gate_pitch * getTotalHeight() * getGenProperties()->get("INV1_GatePitches").toDouble();
163        cache->set(cell_name + "->ActiveArea", area);
164        Log::printLine(cell_name + "->ActiveArea=" + (String)area);
165
166        // --------------------------------------------------------------------
167        // Leakage Model Calculation
168        // --------------------------------------------------------------------
169        // Cache leakage power results (for every single signal combination)
170        double leakage_0 = 0.0; // !A
171        double leakage_1 = 0.0; // A
172
173        leakage_0 += getGenProperties()->get("INV0_LeakagePower_0").toDouble();
174        leakage_0 += getGenProperties()->get("INV1_LeakagePower_1").toDouble();
175
176        leakage_1 += getGenProperties()->get("INV0_LeakagePower_1").toDouble();
177        leakage_1 += getGenProperties()->get("INV1_LeakagePower_0").toDouble();
178
179        cache->set(cell_name + "->Leakage->!A", leakage_0);
180        cache->set(cell_name + "->Leakage->A", leakage_1);
181        Log::printLine(cell_name + "->Leakage->!A=" + (String) leakage_0);
182        Log::printLine(cell_name + "->Leakage->A=" + (String) leakage_1);
183        // --------------------------------------------------------------------
184
185        // --------------------------------------------------------------------
186        // Get Node Capacitances
187        // --------------------------------------------------------------------
188        double a_cap = getNet("A")->getTotalDownstreamCap();
189        double y_b_cap = getNet("Y_b")->getTotalDownstreamCap();
190        double y_cap = getNet("Y")->getTotalDownstreamCap();
191
192        cache->set(cell_name + "->Cap->A", a_cap);
193        cache->set(cell_name + "->Cap->Y_b", y_b_cap);
194        cache->set(cell_name + "->Cap->Y", y_cap);
195        Log::printLine(cell_name + "->Cap->A_Cap=" + (String) a_cap);
196        Log::printLine(cell_name + "->Cap->Y_b_Cap=" + (String) y_b_cap);
197        Log::printLine(cell_name + "->Cap->Y_Cap=" + (String) y_cap);
198        // --------------------------------------------------------------------
199
200        // --------------------------------------------------------------------
201        // Build Internal Delay Model
202        // --------------------------------------------------------------------
203        double y_ron = getDriver("INV1_RonZN")->getOutputRes();
204        double a_to_y_delay = getDriver("INV0_RonZN")->calculateDelay() +
205                              getDriver("INV1_RonZN")->calculateDelay();
206
207        cache->set(cell_name + "->DriveRes->Y", y_ron);
208        cache->set(cell_name + "->Delay->A_to_Y", a_to_y_delay);
209        Log::printLine(cell_name + "->DriveRes->Y=" + (String) y_ron);
210        Log::printLine(cell_name + "->Delay->A_to_Y=" + (String) a_to_y_delay);
211        // --------------------------------------------------------------------
212
213        return;
214    }
215} // namespace DSENT
216
217