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path: root/src/lib/netlist/devices/nld_74165.cpp
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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