summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/netlist/devices/nld_7493.cpp
blob: 1f22ce27fe88207233380dc3971be549e04956be (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
// license:GPL-2.0+
// copyright-holders:Couriersud
/*
 * nld_7493.cpp
 *
 *  DM7493: Binary Counters
 *
 *          +--------------+
 *        B |1     ++    14| A
 *      R01 |2           13| NC
 *      R02 |3           12| QA
 *       NC |4    7493   11| QD
 *      VCC |5           10| GND
 *       NC |6            9| QB
 *       NC |7            8| QC
 *          +--------------+
 *
 *          Counter Sequence
 *
 *          +-------++----+----+----+----+
 *          | COUNT || QD | QC | QB | QA |
 *          +=======++====+====+====+====+
 *          |    0  ||  0 |  0 |  0 |  0 |
 *          |    1  ||  0 |  0 |  0 |  1 |
 *          |    2  ||  0 |  0 |  1 |  0 |
 *          |    3  ||  0 |  0 |  1 |  1 |
 *          |    4  ||  0 |  1 |  0 |  0 |
 *          |    5  ||  0 |  1 |  0 |  1 |
 *          |    6  ||  0 |  1 |  1 |  0 |
 *          |    7  ||  0 |  1 |  1 |  1 |
 *          |    8  ||  1 |  0 |  0 |  0 |
 *          |    9  ||  1 |  0 |  0 |  1 |
 *          |   10  ||  1 |  0 |  1 |  0 |
 *          |   11  ||  1 |  0 |  1 |  1 |
 *          |   12  ||  1 |  1 |  0 |  0 |
 *          |   13  ||  1 |  1 |  0 |  1 |
 *          |   14  ||  1 |  1 |  1 |  0 |
 *          |   15  ||  1 |  1 |  1 |  1 |
 *          +-------++----+----+----+----+
 *
 *          Note C Output QA is connected to input B
 *
 *          Reset Count Function table
 *
 *          +-----+-----++----+----+----+----+
 *          | R01 | R02 || QD | QC | QB | QA |
 *          +=====+=====++====+====+====+====+
 *          |  1  |  1  ||  0 |  0 |  0 |  0 |
 *          |  0  |  X  ||       COUNT       |
 *          |  X  |  0  ||       COUNT       |
 *          +-----+-----++----+----+----+----+
 *
 *  Naming conventions follow National Semiconductor datasheet
 *
 */

#include "nl_base.h"


namespace netlist
{
	namespace devices
	{

	static const std::array<netlist_time, 3> out_delay { NLTIME_FROM_NS(18), NLTIME_FROM_NS(36), NLTIME_FROM_NS(54) };

	NETLIB_OBJECT(7493)
	{
		NETLIB_CONSTRUCTOR(7493)
		, m_CLKA(*this, "CLKA", NETLIB_DELEGATE(updA))
		, m_CLKB(*this, "CLKB", NETLIB_DELEGATE(updB))
		, m_QA(*this, "QA")
		, m_QB(*this, {"QB", "QC", "QD"})
		, m_a(*this, "m_a", 0)
		, m_bcd(*this, "m_b", 0)
		, m_R1(*this, "R1", NETLIB_DELEGATE(inputs))
		, m_R2(*this, "R2", NETLIB_DELEGATE(inputs))
		, m_power_pins(*this)
		{
		}

	private:
		NETLIB_RESETI()
		{
			m_a = m_bcd = 0;
			m_CLKA.set_state(logic_t::STATE_INP_HL);
			m_CLKB.set_state(logic_t::STATE_INP_HL);
		}

		NETLIB_HANDLERI(inputs)
		{
			if (!(m_R1() && m_R2()))
			{
				m_CLKA.activate_hl();
				m_CLKB.activate_hl();
			}
			else
			{
				m_CLKA.inactivate();
				m_CLKB.inactivate();
				m_QA.push(0, NLTIME_FROM_NS(40));
				m_QB.push(0, NLTIME_FROM_NS(40));
				m_a = m_bcd = 0;
			}
		}

		NETLIB_HANDLERI(updA)
		{
			m_a ^= 1;
			m_QA.push(m_a, out_delay[0]);
		}

		NETLIB_HANDLERI(updB)
		{
			const auto cnt(++m_bcd &= 0x07);
			m_QB.push(cnt, out_delay);
		}

		logic_input_t m_CLKA;
		logic_input_t m_CLKB;

		logic_output_t m_QA;
		object_array_t<logic_output_t, 3> m_QB;

		state_var<unsigned> m_a;
		state_var<unsigned> m_bcd;

		logic_input_t m_R1;
		logic_input_t m_R2;

		nld_power_pins m_power_pins;
	};

	NETLIB_DEVICE_IMPL(7493,        "TTL_7493", "+CLKA,+CLKB,+R1,+R2,@VCC,@GND")

	} // namespace devices
} // namespace netlist