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// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/*
* nld_74165.cpp
*
*/
#include "nld_74165.h"
#include "../nl_base.h"
namespace netlist
{
namespace devices
{
NETLIB_OBJECT(74165)
{
NETLIB_CONSTRUCTOR(74165)
, m_DATA(*this, {{ "H", "G", "F", "E", "D", "C", "B", "A" }})
, m_SER(*this, "SER")
, m_SH_LDQ(*this, "SH_LDQ")
, m_CLK(*this, "CLK")
, m_CLKINH(*this, "CLKINH")
, m_QH(*this, "QH")
, m_QHQ(*this, "QHQ")
, m_shifter(*this, "m_shifter", 0)
, m_last_CLK(*this, "m_last_CLK", 0)
{
}
NETLIB_RESETI();
NETLIB_UPDATEI();
protected:
object_array_t<logic_input_t, 8> m_DATA;
logic_input_t m_SER;
logic_input_t m_SH_LDQ;
logic_input_t m_CLK;
logic_input_t m_CLKINH;
logic_output_t m_QH;
logic_output_t m_QHQ;
state_var<unsigned> m_shifter;
state_var<unsigned> m_last_CLK;
};
NETLIB_OBJECT_DERIVED(74165_dip, 74165)
{
NETLIB_CONSTRUCTOR_DERIVED(74165_dip, 74165)
{
register_subalias("1", m_SH_LDQ);
register_subalias("2", m_CLK);
register_subalias("3", m_DATA[4]);
register_subalias("4", m_DATA[5]);
register_subalias("5", m_DATA[6]);
register_subalias("6", m_DATA[7]);
register_subalias("7", m_QHQ);
register_subalias("9", m_QH);
register_subalias("10", m_SER);
register_subalias("11", m_DATA[0]);
register_subalias("12", m_DATA[1]);
register_subalias("13", m_DATA[2]);
register_subalias("14", m_DATA[3]);
register_subalias("15", m_CLKINH);
}
};
NETLIB_RESET(74165)
{
m_shifter = 0;
m_last_CLK = 0;
}
// FIXME: Timing
NETLIB_UPDATE(74165)
{
netlist_sig_t old_qh = m_QH.net().Q();
netlist_sig_t qh = 0;
if (!m_SH_LDQ())
{
m_shifter = 0;
for (std::size_t i=0; i<8; i++)
m_shifter |= (m_DATA[i]() << i);
}
else if (!m_CLK() || m_CLKINH())
{
qh = old_qh;
}
else if (!m_last_CLK)
{
unsigned high_bit = m_SER() ? 0x80 : 0;
m_shifter = high_bit | (m_shifter >> 1);
}
qh = m_shifter & 1;
m_last_CLK = m_CLK();
m_QH.push(qh, NLTIME_FROM_NS(20)); // FIXME: Timing
}
NETLIB_DEVICE_IMPL(74165)
NETLIB_DEVICE_IMPL(74165_dip)
} //namespace devices
} // namespace netlist
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