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
|
/*****************************************************************************
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.
*****************************************************************************/
/*****************************************************************************
stepwise_simulation.cpp -- Test step-wise simulation
Original Author: Philipp A. Hartmann, OFFIS, 2011-01-21
*****************************************************************************/
/*****************************************************************************
MODIFICATION LOG - modifiers, enter your name, affiliation, date and
changes you are making here.
Name, Affiliation, Date:
Description of Modification:
*****************************************************************************/
#include <systemc.h>
const int num_events = 2;
const sc_time delay( 10, SC_NS );
//#define EXPLICIT_DELTA // should not modify the trace
#define DELAYED_EVENTS
SC_MODULE(echo)
{
sc_event ev[num_events];
SC_CTOR(echo)
: self_trigger(3)
{
SC_METHOD(do_print);
# ifdef DELAYED_EVENTS
dont_initialize();
# endif
for( int i=0; i<num_events; ++i )
sensitive << ev[i];
}
void do_print()
{
std::cout << "`" << sc_get_current_process_handle().name()
<< "' triggered at " << sc_time_stamp()
<< " - delta: " << sc_delta_count()
<< std::endl;
if( --self_trigger > 1 )
next_trigger( delay/2 );
else if( self_trigger == 1 )
next_trigger( SC_ZERO_TIME );
else
self_trigger = 3;
}
int self_trigger;
};
void do_step( sc_time const & step )
{
sc_dt::uint64 delta = sc_delta_count();
static bool start_delta = ( delta == 0 ) && ( step == SC_ZERO_TIME );
std::cout
<< " ----- running for "
<< ( ( step == SC_ZERO_TIME ) ? "delta" : step.to_string() )
<< std::endl;
sc_time start = sc_time_stamp();
if( step > SC_ZERO_TIME )
{
std::cout << " --- No-op start (warning) - ";
sc_start( step / 2, SC_EXIT_ON_STARVATION );
sc_assert( start == sc_time_stamp() );
sc_start( step / 2, SC_RUN_TO_TIME );
sc_assert( start + step / 2 == sc_time_stamp() );
sc_start( step / 2 ); // complete step
}
else
{
sc_start( SC_ZERO_TIME );
}
sc_assert( start + step == sc_time_stamp() );
std::cout
<< " -- stopped at - "
<< sc_time_stamp() << " - delta: " << sc_delta_count()
<< std::endl;
// delta has only increased, when a delta has been run
sc_assert( sc_delta_count()
== delta + ( !start_delta && step == SC_ZERO_TIME ) );
start_delta = false;
}
int sc_main(int, char*[])
{
sc_assert( !sc_pending_activity() );
sc_assert( sc_time_to_pending_activity()
== sc_max_time() - sc_time_stamp() );
sc_signal<bool> toggle("toggle");
echo dut("echo");
// notify future events
for( int i=0; i<num_events; ++i )
dut.ev[i].notify( (i+1) * delay );
sc_assert( sc_pending_activity_at_future_time() );
sc_assert( sc_time_to_pending_activity() == delay );
do_step( SC_ZERO_TIME ); // elaborate
while( sc_pending_activity() )
{
sc_assert( sc_pending_activity_at_current_time()
|| sc_time_to_pending_activity() > SC_ZERO_TIME );
sc_assert( sc_pending_activity_at_future_time()
|| sc_time_to_pending_activity() == SC_ZERO_TIME );
// run single (time) step
do_step( sc_time_to_pending_activity() );
# ifdef EXPLICIT_DELTA
// run remaining current deltas (optional)
while( sc_pending_activity_at_current_time() ) {
sc_assert( sc_time_to_pending_activity() == SC_ZERO_TIME );
do_step( SC_ZERO_TIME );
}
# endif // EXPLICIT_DELTA
}
// force one empty evaluate (w/ non-empty update)
toggle.write( !toggle.read() );
sc_assert( sc_pending_activity_at_current_time() );
sc_start( SC_ZERO_TIME );
sc_assert( !sc_pending_activity() );
sc_assert( sc_time_to_pending_activity()
== sc_max_time() - sc_time_stamp() );
std::cout << "Success" << std::endl;
return 0;
}
|
