summaryrefslogtreecommitdiffstatshomepage
path: root/src/emu/netlist/devices/nld_74123.c
blob: aef93f6ab06f6a4add1c2390764fe0353b566a7d (plain) (blame)
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
/*
 * nld_74123.c
 *
 */

#include "nld_74123.h"

#define R_OFF (1E20)
#define R_ON (m_RI.Value())

NETLIB_START(74123)
{

    register_sub(m_RP, "RP");
    register_sub(m_RN, "RN");

    register_input("A", m_A);
    register_input("B", m_B);
    register_input("CLRQ", m_CLRQ);
    register_output("Q", m_Q);
    register_output("QQ", m_QQ);

    register_input("_CV", m_CV); // internal

    register_subalias("GND", m_RN.m_N);
    register_subalias("VCC", m_RP.m_P);
    register_subalias("C",   m_RN.m_N);
    register_subalias("RC",  m_RN.m_P);

    register_param("K", m_K, 0.4);
    register_param("RI", m_RI, 400.0); // around 250 for HC series, 400 on LS/TTL, estimated from datasheets

    connect(m_RN.m_P, m_RP.m_N);
    connect(m_CV, m_RN.m_P);

    save(NAME(m_last_trig));
    save(NAME(m_state));
    save(NAME(m_KP));

    m_KP = 1.0 / (1.0 + exp(m_K.Value()));
}

NETLIB_UPDATE(74123)
{
    const netlist_sig_t m_trig = (INPLOGIC(m_A) ^ 1) & INPLOGIC(m_B) & INPLOGIC(m_CLRQ);

    if (!INPLOGIC(m_CLRQ))
    {
        OUTLOGIC(m_Q, 0, NLTIME_FROM_NS(10));
        OUTLOGIC(m_QQ, 1, NLTIME_FROM_NS(10));
        /* quick charge until trigger */
        /* FIXME: SGS datasheet shows quick charge to 5V,
         * though schematics indicate quick charge to Vhigh only.
         */
        m_RP.set_R(R_ON);
        m_RN.set_R(R_OFF);
        m_state = 2; //charging (quick)
    }
    else if (!m_last_trig && m_trig)
    {
        // FIXME: Timing!
        OUTLOGIC(m_Q, 1, NLTIME_FROM_NS(10));
        OUTLOGIC(m_QQ, 0, NLTIME_FROM_NS(10));
        m_RN.set_R(R_ON);
        m_RP.set_R(R_OFF);
        m_state = 1; // discharging
    }

    m_last_trig = m_trig;

    if (m_state == 1)
    {
        const double vLow = m_KP * TERMANALOG(m_RP.m_P);
        if (INPANALOG(m_CV) < vLow)
        {
            m_RN.set_R(R_OFF);
            m_state = 2; // charging
        }
    }
    else if (m_state == 2)
    {
        const double vHigh = TERMANALOG(m_RP.m_P) * (1.0 - m_KP);
        if (INPANALOG(m_CV) > vHigh)
        {
            m_RP.set_R(R_OFF);
            OUTLOGIC(m_Q, 0, NLTIME_FROM_NS(10));
            OUTLOGIC(m_QQ, 1, NLTIME_FROM_NS(10));
            m_state = 0; // waiting
        }
    }
}

NETLIB_RESET(74123)
{
    m_RP.do_reset();
    m_RN.do_reset();

    m_RP.set_R(R_OFF);
    m_RN.set_R(R_OFF);

    m_last_trig = 0;
    m_state = 0;
    m_QQ.initial(1);
}

NETLIB_START(74123_dip)
{
#if 0
	register_sub(m_1, "1");
	register_sub(m_2, "2");
	register_sub(m_3, "3");

	register_subalias("1", m_1.m_i[0]);
	register_subalias("2", m_1.m_i[1]);
	register_subalias("3", m_2.m_i[0]);
	register_subalias("4", m_2.m_i[1]);
	register_subalias("5", m_2.m_i[2]);
	register_subalias("6", m_2.m_Q);

	register_subalias("8", m_3.m_Q);
	register_subalias("9", m_3.m_i[0]);
	register_subalias("10", m_3.m_i[1]);
	register_subalias("11", m_3.m_i[2]);

	register_subalias("12", m_1.m_Q);
	register_subalias("13", m_1.m_i[2]);
#endif
}

NETLIB_UPDATE(74123_dip)
{
	/* only called during startup */
	m_1.update_dev();
	m_2.update_dev();
}

NETLIB_RESET(74123_dip)
{
	m_1.do_reset();
	m_2.do_reset();
}