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
236
|
/*****************************************************************************
Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
more contributor license agreements. See the NOTICE file distributed
with this work for additional information regarding copyright ownership.
Accellera licenses this file to you under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with the
License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied. See the License for the specific language governing
permissions and limitations under the License.
*****************************************************************************/
/*****************************************************************************
switch.cpp - This is the implementation file for the asynchronous process
"switch".
Original Author: Rashmi Goswami, Synopsys, Inc.
*****************************************************************************/
/*****************************************************************************
MODIFICATION LOG - modifiers, enter your name, affiliation, date and
changes you are making here.
Name, Affiliation, Date:
Description of Modification:
*****************************************************************************/
#include "systemc.h"
#include "pkt.h"
#include "switch.h"
#include "fifo.h"
#include "switch_reg.h"
#define SIM_NUM 500
void mcast_pkt_switch :: entry()
{
wait();
// declarations
switch_reg R0;
switch_reg R1;
switch_reg R2;
switch_reg R3;
switch_reg temp;
int sim_count;
int pkt_count;
int drop_count;
fifo q0_in;
fifo q1_in;
fifo q2_in;
fifo q3_in;
fifo q0_out;
fifo q1_out;
fifo q2_out;
fifo q3_out;
// FILE *result;
// initialization
pkt_count = 0;
drop_count = 0;
sim_count = 0;
q0_in.pntr = 0;
q1_in.pntr = 0;
q2_in.pntr = 0;
q3_in.pntr = 0;
q0_out.pntr = 0;
q1_out.pntr = 0;
q2_out.pntr = 0;
q3_out.pntr = 0;
q0_in.full = false;
q1_in.full = false;
q2_in.full = false;
q3_in.full = false;
q0_in.empty = true;
q1_in.empty = true;
q2_in.empty = true;
q3_in.empty = true;
q0_out.full = false;
q1_out.full = false;
q2_out.full = false;
q3_out.full = false;
q0_out.empty = true;
q1_out.empty = true;
q2_out.empty = true;
q3_out.empty = true;
R0.free = true;
R1.free = true;
R2.free = true;
R3.free = true;
// result = fopen("result","w");
cout << endl;
cout << "-------------------------------------------------------------------------------" << endl;
cout << endl << " 4x4 Multicast Helix Packet Switch Simulation" << endl;
cout << "-------------------------------------------------------------------------------" << endl;
cout << " This is the simulation of a 4x4 non-blocking multicast helix packet switch. " << endl;
cout << " The switch uses a self-routing ring of shift registers to transfer cells " << endl;
cout << " from one port to another in a pipelined fashion, resolving output contention " << endl;
cout << " and handling multicast switch efficiently." << endl << endl;
wait();
// functionality
while( sim_count++ < SIM_NUM )
{
wait();
/////read input packets//////////////////////////////////
if (in0.event())
{
pkt_count++;
if (q0_in.full == true) drop_count++;
else q0_in.pkt_in(in0.read());
};
if (in1.event())
{
pkt_count++;
if (q1_in.full == true) drop_count++;
else q1_in.pkt_in(in1.read());
};
if (in2.event())
{
pkt_count++;
if (q2_in.full == true) drop_count++;
else q2_in.pkt_in(in2.read());
};
if (in3.event())
{
pkt_count++;
if (q3_in.full == true) drop_count++;
else q3_in.pkt_in(in3.read());
};
/////move the packets from fifo to shift register ring/////
if((!q0_in.empty) && R0.free)
{
R0.val = q0_in.pkt_out();
R0.free = false;
}
if((!q1_in.empty) && R1.free)
{
R1.val = q1_in.pkt_out();
R1.free = false;
}
if((!q2_in.empty) && R2.free)
{
R2.val = q2_in.pkt_out();
R2.free = false;
}
if((!q3_in.empty) && R3.free)
{
R3.val = q3_in.pkt_out();
R3.free = false;
}
if((bool)switch_cntrl && switch_cntrl.event())
{
/////shift the channel registers /////////////////////////
temp = R0;
R0 = R1;
R1 = R2;
R2 = R3;
R3 = temp;
/////write the register values to output fifos////////////
if ((!R0.free) && (R0.val.dest0) && (!q0_out.full))
{
q0_out.pkt_in(R0.val);
R0.val.dest0 = false;
if (!(R0.val.dest0|R0.val.dest1|R0.val.dest2|R0.val.dest3)) R0.free = true;
}
if ((!R1.free) && (R1.val.dest1) && (!q1_out.full))
{
q1_out.pkt_in(R1.val);
R1.val.dest1 = false;
if (!(R1.val.dest0|R1.val.dest1|R1.val.dest2|R1.val.dest3)) R1.free = true;
}
if ((!R2.free) && (R2.val.dest2) && (!q2_out.full))
{
q2_out.pkt_in(R2.val);
R2.val.dest2 = false;
if (!(R2.val.dest0|R2.val.dest1|R2.val.dest2|R2.val.dest3)) R2.free = true;
}
if ((!R3.free) && (R3.val.dest3) && (!q3_out.full))
{
q3_out.pkt_in(R3.val);
R3.val.dest3 = false;
if (!(R3.val.dest0|R3.val.dest1|R3.val.dest2|R3.val.dest3)) R3.free = true;
}
/////write the packets out//////////////////////////////////
if (!q0_out.empty) out0.write(q0_out.pkt_out());
if (!q1_out.empty) out1.write(q1_out.pkt_out());
if (!q2_out.empty) out2.write(q2_out.pkt_out());
if (!q3_out.empty) out3.write(q3_out.pkt_out());
}
}
sc_stop();
cout << endl << endl << "-------------------------------------------------------------------------------" << endl;
cout << "End of switch operation..." << endl;
cout << "Total number of packets received: " << pkt_count << endl;
cout << "Total number of packets dropped: " << drop_count << endl;
cout << "Percentage packets dropped: " << drop_count*100/pkt_count << endl;
cout << "-------------------------------------------------------------------------------" << endl;
}
|
