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path: root/src/emu/netlist/devices/nld_7474.c
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/*
 * nld_7474.c
 *
 */

#include "nld_7474.h"

ATTR_HOT inline void NETLIB_NAME(7474sub)::newstate(const UINT8 state)
{
    static const netlist_time delay[2] = { NLTIME_FROM_NS(25), NLTIME_FROM_NS(40) };
    OUTLOGIC(m_Q, state, delay[state]);
    OUTLOGIC(m_QQ, !state, delay[!state]);
}

NETLIB_UPDATE(7474sub)
{
    //if (!INP_LAST(m_clk) & INP(m_clk))
    {
        newstate(m_nextD);
        m_clk.inactivate();
    }
}

NETLIB_UPDATE(7474)
{
    if (!INPLOGIC(m_preQ))
    {
        sub.newstate(1);
        sub.m_clk.inactivate();
        m_D.inactivate();
    }
    else if (!INPLOGIC(m_clrQ))
    {
        sub.newstate(0);
        sub.m_clk.inactivate();
        m_D.inactivate();
    }
    else
    {
        m_D.activate();
        sub.m_nextD = INPLOGIC(m_D);
        sub.m_clk.activate_lh();
    }
}

NETLIB_START(7474)
{
    register_sub(sub, "sub");

    register_subalias("CLK",  sub.m_clk);
    register_input("D",    m_D);
    register_input("CLRQ", m_clrQ);
    register_input("PREQ", m_preQ);

    register_subalias("Q",   sub.m_Q);
    register_subalias("QQ",  sub.m_QQ);

}

NETLIB_START(7474sub)
{
    register_input("CLK",  m_clk, netlist_input_t::STATE_INP_LH);

    register_output("Q",   m_Q);
    register_output("QQ",  m_QQ);

    m_Q.initial(1);
    m_QQ.initial(0);
}