summaryrefslogtreecommitdiffstats
path: root/src/lib/netlist/devices/nld_am2847.cpp
blob: 07b811ab0a90b327c68811ff7c12d5f193821971 (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
// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/*
 * nld_am2847.cpp
 *
 *  Am2847: Quad 80-Bit Static Shift Register
 *
 *          +--------------+
 *     OUTA |1     ++    16| VSS
 *      RCA |2           15| IND
 *      INA |3           14| RCD
 *     OUTB |4   Am2847  13| OUTD
 *      RCB |5           12| VGG
 *      INB |6           11| CP
 *     OUTC |7           10| INC
 *      VDD |8            9| RCC
 *          +--------------+
 *
 */

#include "nl_base.h"

namespace netlist::devices {

	NETLIB_OBJECT(Am2847_shifter)
	{
		NETLIB_CONSTRUCTOR_MODEL(Am2847_shifter, "CD4XXX")
		, m_RC(*this, "RC", NETLIB_DELEGATE(inputs))
		, m_IN(*this, "IN", NETLIB_DELEGATE(inputs))
		, m_buffer(*this, "m_buffer", 0)
		, m_OUT(*this, "OUT")
		, m_power_pins(*this)
		{
		}

	public:
		void shift() noexcept
		{
			uint32_t out = m_buffer[0] & 1;
			uint32_t in = (m_RC() ? out : m_IN());
			for (std::size_t i=0; i < 5; i++)
			{
				uint32_t shift_in = (i == 4) ? in : m_buffer[i + 1];
				m_buffer[i] >>= 1;
				m_buffer[i] |= shift_in << 15;
			}

			m_OUT.push(out, NLTIME_FROM_NS(200));
		}

		logic_input_t m_RC;
		logic_input_t m_IN;

		state_container<std::array<uint16_t, 5>> m_buffer;

		logic_output_t m_OUT;
		nld_power_pins m_power_pins;
	private:
		NETLIB_HANDLERI(inputs)
		{
			/* do nothing */
		}
	};

	NETLIB_OBJECT(AM2847)
	{
		NETLIB_CONSTRUCTOR(AM2847)
		, m_A(*this, "A")
		, m_B(*this, "B")
		, m_C(*this, "C")
		, m_D(*this, "D")
		, m_CP(*this, "CP", NETLIB_DELEGATE(cp))
		, m_last_CP(*this, "m_last_CP", 0)
		// FIXME: needs family!
		{
			register_sub_alias("OUTA", "A.OUT");
			register_sub_alias("OUTB", "B.OUT");
			register_sub_alias("OUTC", "C.OUT");
			register_sub_alias("OUTD", "D.OUT");
			register_sub_alias("INA", "A.IN");
			register_sub_alias("INB", "B.IN");
			register_sub_alias("INC", "C.IN");
			register_sub_alias("IND", "D.IN");
			register_sub_alias("RCA", "A.RC");
			register_sub_alias("RCB", "B.RC");
			register_sub_alias("RCC", "C.RC");
			register_sub_alias("RCD", "D.RC");

			connect("A.VSS", "B.VSS");
			connect("A.VSS", "C.VSS");
			connect("A.VSS", "D.VSS");
			connect("A.VDD", "B.VDD");
			connect("A.VDD", "C.VDD");
			connect("A.VDD", "D.VDD");

			register_sub_alias("VSS", "A.VSS");
			register_sub_alias("VDD", "A.VDD");
		}

		NETLIB_RESETI()
		{
			m_last_CP = 0;
		}

	private:
		NETLIB_HANDLERI(cp)
		{
			if (m_last_CP && !m_CP())
			{
				m_A().shift();
				m_B().shift();
				m_C().shift();
				m_D().shift();
			}
			m_last_CP = m_CP();
		}

		NETLIB_SUB(Am2847_shifter) m_A;
		NETLIB_SUB(Am2847_shifter) m_B;
		NETLIB_SUB(Am2847_shifter) m_C;
		NETLIB_SUB(Am2847_shifter) m_D;
		logic_input_t m_CP;

		state_var<uint32_t> m_last_CP;
	};

	NETLIB_DEVICE_IMPL(AM2847,     "TTL_AM2847",     "+CP,+INA,+INB,+INC,+IND,+RCA,+RCB,+RCC,+RCD,@VSS,@VDD")

} // namespace netlist::devices