diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_82S123.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_82S123.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_82S123.cpp b/src/lib/netlist/devices/nld_82S123.cpp new file mode 100644 index 00000000000..f9e97174d4a --- /dev/null +++ b/src/lib/netlist/devices/nld_82S123.cpp @@ -0,0 +1,83 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_82S123.cpp + * + */ + +#include "nld_82S123.h" + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(82S123) + { + NETLIB_CONSTRUCTOR(82S123) + , m_A(*this, {{"A0", "A1", "A2", "A3", "A4"}}) + , m_CEQ(*this, "CEQ") + , m_O(*this, {{"O1", "O2", "O3", "O4", "O5", "O6", "O7", "O8"}}) + , m_ROM(*this, "ROM") + { + } + + NETLIB_UPDATEI(); + + protected: + object_array_t<logic_input_t, 5> m_A; + logic_input_t m_CEQ; + object_array_t<logic_output_t, 8> m_O; + + param_rom_t<uint8_t, 5, 8> m_ROM; // 256 bits, 32x8 + }; + + NETLIB_OBJECT_DERIVED(82S123_dip, 82S123) + { + NETLIB_CONSTRUCTOR_DERIVED(82S123_dip, 82S123) + { + register_subalias("1", m_O[0]); + register_subalias("2", m_O[1]); + register_subalias("3", m_O[2]); + register_subalias("4", m_O[3]); + register_subalias("5", m_O[4]); + register_subalias("6", m_O[5]); + register_subalias("7", m_O[6]); + register_subalias("8", m_O[7]); + + register_subalias("15", m_CEQ); + + register_subalias("10", m_A[0]); + register_subalias("11", m_A[1]); + register_subalias("12", m_A[2]); + register_subalias("13", m_A[3]); + register_subalias("14", m_A[4]); + } + }; + + // FIXME: timing! + NETLIB_UPDATE(82S123) + { + unsigned o = 0xff; + + netlist_time delay = NLTIME_FROM_NS(35); + if (!m_CEQ()) + { + unsigned a = 0; + for (std::size_t i=0; i<5; 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<8; i++) + m_O[i].push((o >> i) & 1, delay); + } + + NETLIB_DEVICE_IMPL(82S123) + NETLIB_DEVICE_IMPL(82S123_dip) + + } //namespace devices +} // namespace netlist |