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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
 * nld_7490.c
 *
 */

#include "nld_7490.h"
#include "netlist/nl_base.h"

namespace netlist
{
	namespace devices
	{
	NETLIB_OBJECT(7490)
	{
		NETLIB_CONSTRUCTOR(7490)
		, m_A(*this, "A")
		, m_B(*this, "B")
		, m_R1(*this, "R1")
		, m_R2(*this, "R2")
		, m_R91(*this, "R91")
		, m_R92(*this, "R92")
		, m_cnt(*this, "m_cnt", 0)
		, m_last_A(*this, "m_last_A", 0)
		, m_last_B(*this, "m_last_B", 0)
		, m_Q(*this, {{"QA", "QB", "QC", "QD"}})
		{
		}

	private:
		NETLIB_UPDATEI();
		NETLIB_RESETI();

		void update_outputs();

		logic_input_t m_A;
		logic_input_t m_B;
		logic_input_t m_R1;
		logic_input_t m_R2;
		logic_input_t m_R91;
		logic_input_t m_R92;

		state_var_u8 m_cnt;
		state_var<netlist_sig_t> m_last_A;
		state_var<netlist_sig_t> m_last_B;

		object_array_t<logic_output_t, 4> m_Q;
	};

	NETLIB_OBJECT_DERIVED(7490_dip, 7490)
	{
		NETLIB_CONSTRUCTOR_DERIVED(7490_dip, 7490)
		{
			register_subalias("1", "B");
			register_subalias("2", "R1");
			register_subalias("3", "R2");

			// register_subalias("4", ); --> NC
			// register_subalias("5", ); --> VCC
			register_subalias("6", "R91");
			register_subalias("7", "R92");

			register_subalias("8", "QC");
			register_subalias("9", "QB");
			// register_subalias("10", ); --> GND
			register_subalias("11", "QD");
			register_subalias("12", "QA");
			// register_subalias("13", ); --> NC
			register_subalias("14", "A");
		}
	};

	NETLIB_RESET(7490)
	{
		m_cnt = 0;
		m_last_A = 0;
		m_last_B = 0;
	}

	static constexpr const netlist_time delay[4] =
	{
			NLTIME_FROM_NS(18),
			NLTIME_FROM_NS(36) - NLTIME_FROM_NS(18),
			NLTIME_FROM_NS(54) - NLTIME_FROM_NS(18),
			NLTIME_FROM_NS(72) - NLTIME_FROM_NS(18)
	};

	NETLIB_UPDATE(7490)
	{
		const netlist_sig_t new_A = m_A();
		const netlist_sig_t new_B = m_B();

		if (m_R91() & m_R92())
		{
			m_cnt = 9;
			update_outputs();
		}
		else if (m_R1() & m_R2())
		{
			m_cnt = 0;
			update_outputs();
		}
		else
		{
			if (m_last_A && !new_A)  // High - Low
			{
				m_cnt ^= 1;
				m_Q[0].push(m_cnt & 1, delay[0]);
			}
			if (m_last_B && !new_B)  // High - Low
			{
				m_cnt += 2;
				if (m_cnt >= 10)
					m_cnt &= 1; /* Output A is not reset! */
				update_outputs();
			}
		}
		m_last_A = new_A;
		m_last_B = new_B;
	}

	NETLIB_FUNC_VOID(7490, update_outputs, ())
	{
		for (std::size_t i=0; i<4; i++)
			m_Q[i].push((m_cnt >> i) & 1, delay[i]);
	}

	NETLIB_DEVICE_IMPL(7490,     "TTL_7490",        "+A,+B,+R1,+R2,+R91,+R92")
	NETLIB_DEVICE_IMPL(7490_dip, "TTL_7490_DIP",    "")

	} //namespace devices
} // namespace netlist