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// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/*
* nld_82S126.cpp
*
*/
#include "nld_82S126.h"
#include "netlist/nl_base.h"
namespace netlist
{
namespace devices
{
NETLIB_OBJECT(82S126)
{
NETLIB_CONSTRUCTOR(82S126)
, m_A(*this, {"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7" })
, m_CE1Q(*this, "CE1Q")
, m_CE2Q(*this, "CE2Q")
, m_O(*this, {"O1", "O2", "O3", "O4" })
, m_ROM(*this, "ROM")
, m_power_pins(*this)
{
}
NETLIB_UPDATEI();
friend class NETLIB_NAME(82S126_dip);
private:
object_array_t<logic_input_t, 8> m_A;
logic_input_t m_CE1Q;
logic_input_t m_CE2Q;
object_array_t<logic_output_t, 4> m_O;
param_rom_t<uint8_t, 8, 4> m_ROM; // 1024 bits, 32x32, used as 256x4
nld_power_pins m_power_pins;
};
NETLIB_OBJECT(82S126_dip)
{
NETLIB_CONSTRUCTOR(82S126_dip)
, A(*this, "A")
{
register_subalias("5", A.m_A[0]);
register_subalias("6", A.m_A[1]);
register_subalias("7", A.m_A[2]);
register_subalias("4", A.m_A[3]);
register_subalias("3", A.m_A[4]);
register_subalias("2", A.m_A[5]);
register_subalias("1", A.m_A[6]);
register_subalias("15", A.m_A[7]);
register_subalias("13", A.m_CE1Q);
register_subalias("14", A.m_CE2Q);
register_subalias("12", A.m_O[0]);
register_subalias("11", A.m_O[1]);
register_subalias("10", A.m_O[2]);
register_subalias("9", A.m_O[3]);
register_subalias("8", "A.GND");
register_subalias("16", "A.VCC");
}
NETLIB_RESETI() {}
NETLIB_UPDATEI() {}
private:
NETLIB_SUB(82S126) A;
};
// FIXME: timing!
NETLIB_UPDATE(82S126)
{
unsigned o = 0xf;
netlist_time delay = NLTIME_FROM_NS(25);
if (!m_CE1Q() && !m_CE2Q())
{
unsigned a = 0;
for (std::size_t i=0; i<8; i++)
a |= (m_A[i]() << i);
o = m_ROM[a];
delay = NLTIME_FROM_NS(50);
}
// FIXME: Outputs are tristate. This needs to be properly implemented
for (std::size_t i=0; i<4; i++)
m_O[i].push((o >> i) & 1, delay);
}
NETLIB_DEVICE_IMPL(82S126, "PROM_82S126", "+CE1Q,+CE2Q,+A0,+A1,+A2,+A3,+A4,+A5,+A6,+A7,@VCC,@GND")
NETLIB_DEVICE_IMPL(82S126_dip, "PROM_82S126_DIP", "")
} //namespace devices
} // namespace netlist
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