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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* nld_74153.cpp
*
* DM74153: Dual 4-Line to 1-Line Data Selectors Multiplexers
*
* +--------------+
* G1 |1 ++ 16| VCC
* B |2 15| G2
* 1C3 |3 14| A
* 1C2 |4 74153 13| 2C3
* 1C1 |5 12| 2C2
* 1C0 |6 11| 2C1
* Y1 |7 10| 2C0
* GND |8 9| Y2
* +--------------+
*
*
* Function table
*
* +-----+-----++----+----+----+----++----+----+
* | B | A || C0 | C1 | C2 | C3 || G | Y |
* +=====+=====++====+====+====+====++====+====+
* | X | X || X | X | X | X || H | L |
* | L | L || L | X | X | X || L | L |
* | L | L || H | X | X | X || L | H |
* | L | H || X | L | X | X || L | L |
* | L | H || X | H | X | X || L | H |
* | H | L || X | X | L | X || L | L |
* | H | L || X | X | H | X || L | H |
* | H | H || X | X | X | L || L | L |
* | H | H || X | X | X | H || L | H |
* +-----+-----++----+----+----+----++----+----+
*
* A, B : Select Inputs
* C* : Data inputs
* G : Strobe
* Y : Output
*
* Naming conventions follow National Semiconductor datasheet
*
*/
#include "nld_74153.h"
#include "nl_base.h"
namespace netlist
{
namespace devices
{
// FIXME: timing is not 100% accurate, Strobe and Select inputs have a
// slightly longer timing .
// FIXME: Truthtable candidate
NETLIB_OBJECT(74153)
{
NETLIB_CONSTRUCTOR(74153)
, m_C(*this, {"C0", "C1", "C2", "C3"}, NETLIB_DELEGATE(sub))
, m_G(*this, "G", NETLIB_DELEGATE(sub))
, m_Y(*this, "AY") //FIXME: Change netlists
, m_chan(*this, "m_chan", 0)
, m_A(*this, "A", NETLIB_DELEGATE(other))
, m_B(*this, "B", NETLIB_DELEGATE(other))
, m_power_pins(*this)
{
}
private:
NETLIB_RESETI()
{
m_chan = 0;
}
NETLIB_HANDLERI(other)
{
m_chan = (m_A() | (m_B()<<1));
sub();
}
NETLIB_HANDLERI(sub)
{
constexpr const std::array<netlist_time, 2> delay = { NLTIME_FROM_NS(23), NLTIME_FROM_NS(18) };
if (!m_G())
{
auto t = m_C[m_chan]();
m_Y.push(t, delay[t]);
}
else
{
m_Y.push(0, delay[0]);
}
}
object_array_t<logic_input_t, 4> m_C;
logic_input_t m_G;
logic_output_t m_Y;
state_var<unsigned> m_chan;
logic_input_t m_A;
logic_input_t m_B;
nld_power_pins m_power_pins;
};
NETLIB_DEVICE_IMPL(74153, "TTL_74153", "+C0,+C1,+C2,+C3,+A,+B,+G,@VCC,@GND")
} //namespace devices
} // namespace netlist
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