summaryrefslogtreecommitdiff
path: root/ext/dsent/model/electrical/MultiplexerCrossbar.cc
blob: ec3bf3161c77b5b9d764126f1995f6fadff7c62c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/* 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/MultiplexerCrossbar.h"

#include <vector>
#include <cmath>

#include "model/PortInfo.h"
#include "model/EventInfo.h"
#include "model/TransitionInfo.h"
#include "model/timing_graph/ElectricalNet.h"
#include "model/electrical/Multiplexer.h"

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

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

    MultiplexerCrossbar::~MultiplexerCrossbar()
    {}

    void MultiplexerCrossbar::initParameters()
    {
        addParameterName("NumberInputs");
        addParameterName("NumberOutputs");
        addParameterName("NumberBits");
        addParameterName("BitDuplicate", "TRUE");
        return;
    }

    void MultiplexerCrossbar::initProperties()
    {
        return;
    }

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

    void MultiplexerCrossbar::constructModel()
    {
        // Get Parameters
        unsigned int number_inputs = getParameter("NumberInputs").toUInt();
        unsigned int number_outputs = getParameter("NumberOutputs").toUInt();
        unsigned int number_bits = getParameter("NumberBits").toUInt();
        bool bit_duplicate = getParameter("BitDuplicate").toBool();

        ASSERT(number_inputs > 0, "[Error] " + getInstanceName() + " -> Number of inputs must be > 0!");
        ASSERT(number_outputs > 0, "[Error] " + getInstanceName() + " -> Number of outputs must be > 0!");
        ASSERT(number_bits > 0, "[Error] " + getInstanceName() + " -> Number of bits must be > 0!");

        unsigned int number_selects = (unsigned int)ceil(log2((double)number_inputs));
        getGenProperties()->set("NumberSelectsPerPort", number_selects);

        // Construct electrical ports and nets
        // Create input ports
        for(unsigned int i = 0; i < number_inputs; ++i)
        {
            createInputPort("In" + (String)i, makeNetIndex(0, number_bits-1));
        }
        // Create select signals
        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            for(unsigned int j = 0; j < number_selects; ++j)
            {
                createInputPort(String::format("Sel%d_%d", i, j));
            }
        }
        // Create output ports
        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            createOutputPort("Out" + (String)i, makeNetIndex(0, number_bits-1));
        }

        // Create energy, power, and area results
        addAreaResult(new AtomicResult("CrossbarWire"));
        addAreaResult(new AtomicResult("CrossbarFill"));
        createElectricalResults();
        getEventInfo("Idle")->setStaticTransitionInfos();
        createElectricalEventResult("Multicast0");
        getEventInfo("Multicast0")->setStaticTransitionInfos();
        for(unsigned int i = 1; i <= number_outputs; ++i)
        {
            createElectricalEventResult("Multicast" + (String)i);
            EventInfo* event_info = getEventInfo("Multicast" + (String)i);
            // Assuming that In0 is sending to Out0, Out1, ..., Outi
            // and other input ports are static
            for(unsigned int j = 1; j < number_inputs; ++j)
            {
                event_info->setStaticTransitionInfo("In" + (String)j);
            }
            for(unsigned int j = i; j < number_outputs; ++j)
            {
                for(unsigned int k = 0; k < number_selects; ++k)
                {
                    event_info->setStaticTransitionInfo(String::format("Sel%d_%d", j, k));
                }
            }
        }
        createElectricalEventResult("Crossbar");

        // Initiate multiplexers
        vector<String> mux_names(number_outputs, "");
        vector<Multiplexer*> muxs(number_outputs, NULL);
        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            mux_names[i] = "Mux" + (String)i;
            muxs[i] = new Multiplexer(mux_names[i], getTechModel());
            muxs[i]->setParameter("NumberInputs", number_inputs);
            muxs[i]->setParameter("NumberBits", number_bits);
            muxs[i]->setParameter("BitDuplicate", bit_duplicate);
            muxs[i]->construct();
        }

        // Connect inputs and outputs to multiplexers
        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            // Connect inputs
            for(unsigned int j = 0; j < number_inputs; ++j)
            {
                portConnect(muxs[i], "In" + (String)j, "In" + (String)j, makeNetIndex(0, number_bits-1));
            }

            // Connect select signals
            for(unsigned int j = 0; j < number_selects; ++j)
            {
                portConnect(muxs[i], "Sel" + (String)j, String::format("Sel%d_%d", i, j));
            }

            // Connect outputs
            portConnect(muxs[i], "Out", "Out" + (String)i, makeNetIndex(0, number_bits-1));
        }

        // Add area, power, and event results for each mux
        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            addSubInstances(muxs[i], 1.0);
            addElectricalSubResults(muxs[i], 1.0);
            for(unsigned int j = 0; j <= number_outputs; ++j)
            {
                getEventResult("Multicast" + (String)j)->addSubResult(muxs[i]->getEventResult("Mux"), mux_names[i], 1.0);
            }
            getEventResult("Crossbar")->addSubResult(muxs[i]->getEventResult("Mux"), mux_names[i], 1.0);
        }

        // Estimate wiring area
        const String& crossbar_wire_layer = "Intermediate";
        addElectricalWireSubResult(crossbar_wire_layer, getAreaResult("CrossbarWire"), "Self", 1.0);
        double wire_width = getTechModel()->get("Wire->" + crossbar_wire_layer + "->MinWidth").toDouble();
        double wire_spacing = getTechModel()->get("Wire->" + crossbar_wire_layer + "->MinSpacing").toDouble();
        double wire_pitch = wire_width + wire_spacing;
        double wire_area = (number_bits * number_inputs * wire_pitch) * (number_bits * number_outputs * wire_pitch);
        getAreaResult("CrossbarWire")->setValue(wire_area);

        // Add filler area
        getAreaResult("Active")->addSubResult(getAreaResult("CrossbarFill"), "Self", 1.0);
        return;
    }

    void MultiplexerCrossbar::updateModel()
    {
        // Update all sub instances
        Model::updateModel();

        // Update filler area
        // Total Active area = max(stdcell active area, wiring area);
        double wire_area = getAreaResult("CrossbarWire")->calculateSum();
        double active_area = getAreaResult("Active")->calculateSum();
        double fill_area = 0.0;
        if(active_area < wire_area)
        {
            fill_area = wire_area - active_area;
        }
        getAreaResult("CrossbarFill")->setValue(fill_area);
        return;
    }

    void MultiplexerCrossbar::propagateTransitionInfo()
    {
        // The only thing can be updated are the input probabilities
        const unsigned int number_inputs = getParameter("NumberInputs").toUInt();
        const unsigned int number_outputs = getParameter("NumberOutputs").toUInt();

        const unsigned int number_selects = getGenProperties()->get("NumberSelectsPerPort").toUInt();

        for(unsigned int i = 0; i < number_outputs; ++i)
        {
            ElectricalModel* muxi = (ElectricalModel*)getSubInstance("Mux" + (String)i);
            for(unsigned int j = 0; j < number_inputs; ++j)
            {
                propagatePortTransitionInfo(muxi, "In" + (String)j, "In" + (String)j);
            }
            for(unsigned int j = 0; j < number_selects; ++j)
            {
                propagatePortTransitionInfo(muxi, "Sel" + (String)j, String::format("Sel%d_%d", i, j));
            }
            muxi->use();

            // Set output probability
            propagatePortTransitionInfo("Out" + (String)i, muxi, "Out");
        }

        return;
    }

} // namespace DSENT