pr57.cpp revision 12855:588919e0e4aa 
1/*****************************************************************************
2
3  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
4  more contributor license agreements.  See the NOTICE file distributed
5  with this work for additional information regarding copyright ownership.
6  Accellera licenses this file to you under the Apache License, Version 2.0
7  (the "License"); you may not use this file except in compliance with the
8  License.  You may obtain a copy of the License at
9
10    http://www.apache.org/licenses/LICENSE-2.0
11
12  Unless required by applicable law or agreed to in writing, software
13  distributed under the License is distributed on an "AS IS" BASIS,
14  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
15  implied.  See the License for the specific language governing
16  permissions and limitations under the License.
17
18 *****************************************************************************/
19
20/*****************************************************************************
21
22  pr57.cpp --
23
24  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15
25
26 *****************************************************************************/
27
28/*****************************************************************************
29
30  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
31  changes you are making here.
32
33      Name, Affiliation, Date:
34  Description of Modification:
35
36 *****************************************************************************/
37
38#include "systemc.h"
39
40SC_MODULE( pr57 )
41{
42    SC_HAS_PROCESS( pr57 );
43
44    sc_in_clk clk;
45
46    const sc_signal<bool>& a;
47          sc_signal<bool>& b;
48
49    bool c;
50    bool d;
51
52    pr57( sc_module_name NAME,
53          sc_clock& CLK,
54          const sc_signal<bool>& A,
55                sc_signal<bool>& B )
56        :
57          a(A), b(B)
58    {
59      clk(CLK);
60	  SC_CTHREAD( entry, clk.pos() );
61    }
62    void entry();
63    bool pres1(bool x, bool y);
64    bool pres2(bool x);
65    void pres3(bool z);
66};
67
68bool
69pr57::pres1(bool x, bool y)
70{
71    bool u = x | c;
72    bool v = y & d;
73    bool t = d;
74    d = y;
75    c = t;
76    return u ^ v;
77}
78
79bool
80pr57::pres2(bool x)
81{
82    bool u = x & c & d;
83    d = x ^ u;
84    return u;
85}
86
87void
88pr57::pres3(bool z)
89{
90    c = z;
91}
92
93void
94pr57::entry()
95{
96    c = a;
97    d = ! a.read();
98    b = pres1(1, 0);
99    wait();
100    c = ! a.read();
101    d = a;
102    b = pres1(0, 1);
103    wait();
104    c = a;
105    d = ! a.read();
106    b = pres2(0);
107    wait();
108    pres3(!a.read());
109    d = a;
110    b = pres2(1);
111    wait();
112}
113
114int
115sc_main( int, char*[] )
116{
117    return 0;
118}
119