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// license:BSD-3-Clause
// copyright-holders:Joakim Larsson Edstrom
/*
* nld_74164.cpp
*
* Thanks to the 74161 work of Ryan and the huge Netlist effort by Couriersud
* implementing this was simple.
*
*/
#include "nld_74164.h"
#include "netlist/nl_base.h"
#include "nlid_system.h"
namespace netlist
{
namespace devices
{
NETLIB_OBJECT(74164)
{
NETLIB_CONSTRUCTOR(74164)
, m_A(*this, "A")
, m_B(*this, "B")
, m_CLRQ(*this, "CLRQ")
, m_CLK(*this, "CLK")
, m_cnt(*this, "m_cnt", 0)
, m_last_CLK(*this, "m_last_CLK", 0)
, m_Q(*this, {{"QA", "QB", "QC", "QD", "QE", "QF", "QG", "QH"}})
, m_power_pins(*this)
{
}
NETLIB_RESETI();
NETLIB_UPDATEI();
protected:
logic_input_t m_A;
logic_input_t m_B;
logic_input_t m_CLRQ;
logic_input_t m_CLK;
state_var<unsigned> m_cnt;
state_var<unsigned> m_last_CLK;
object_array_t<logic_output_t, 8> m_Q;
nld_power_pins m_power_pins;
};
NETLIB_OBJECT_DERIVED(74164_dip, 74164)
{
NETLIB_CONSTRUCTOR_DERIVED(74164_dip, 74164)
{
register_subalias("1", m_A);
register_subalias("2", m_B);
register_subalias("3", m_Q[0]);
register_subalias("4", m_Q[1]);
register_subalias("5", m_Q[2]);
register_subalias("6", m_Q[3]);
register_subalias("7", "A.GND");
register_subalias("8", m_CLK);
register_subalias("9", m_CLRQ);
register_subalias("10", m_Q[4]);
register_subalias("11", m_Q[5]);
register_subalias("12", m_Q[6]);
register_subalias("13", m_Q[7]);
register_subalias("14", "A.VCC");
connect("A.GND", "B.GND");
connect("A.VCC", "B.VCC");
}
};
NETLIB_RESET(74164)
{
m_cnt = 0;
m_last_CLK = 0;
}
NETLIB_UPDATE(74164)
{
if (!m_CLRQ())
{
m_cnt = 0;
}
else if (m_CLK() && !m_last_CLK)
{
m_cnt = (m_cnt << 1) & 0xfe;
if (m_A() && m_B())
{
m_cnt |= 0x01;
}
else
{
m_cnt &= 0xfe;
}
}
m_last_CLK = m_CLK();
for (std::size_t i=0; i<8; i++)
{
m_Q[i].push((m_cnt >> i) & 1, NLTIME_FROM_NS(30));
}
}
NETLIB_DEVICE_IMPL(74164, "TTL_74164", "+A,+B,+CLRQ,+CLK,@VCC,@GND")
NETLIB_DEVICE_IMPL(74164_dip, "TTL_74164_DIP", "")
} //namespace devices
} // namespace netlist
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