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
|
#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
|