diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_82S115.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_82S115.cpp | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_82S115.cpp b/src/lib/netlist/devices/nld_82S115.cpp new file mode 100644 index 00000000000..c01d013aec5 --- /dev/null +++ b/src/lib/netlist/devices/nld_82S115.cpp @@ -0,0 +1,112 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_82S115.cpp + * + */ + +#include "nld_82S115.h" + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(82S115) + { + NETLIB_CONSTRUCTOR(82S115) + , m_A(*this, {{"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8"}}) + , m_CE1Q(*this, "CE1Q") + , m_CE2(*this, "CE2") + , m_STROBE(*this, "STROBE") + , m_O(*this, {{"O1", "O2", "O3", "O4", "O5", "O6", "O7", "O8"}}) + , m_last_O(*this, "m_last_O", 0) + , m_ROM(*this, "ROM") + { + } + + NETLIB_RESETI(); + NETLIB_UPDATEI(); + + protected: + object_array_t<logic_input_t, 9> m_A; + logic_input_t m_CE1Q; + logic_input_t m_CE2; + logic_input_t m_STROBE; + object_array_t<logic_output_t, 8> m_O; + + state_var<unsigned> m_last_O; + + param_rom_t<uint8_t, 9, 8> m_ROM; // 4096 bits, 512x8 + }; + + NETLIB_OBJECT_DERIVED(82S115_dip, 82S115) + { + NETLIB_CONSTRUCTOR_DERIVED(82S115_dip, 82S115) + { + register_subalias("21", m_A[0]); + register_subalias("22", m_A[1]); + register_subalias("23", m_A[2]); + register_subalias("1", m_A[3]); + register_subalias("2", m_A[4]); + register_subalias("3", m_A[5]); + register_subalias("4", m_A[6]); + register_subalias("5", m_A[7]); + register_subalias("6", m_A[8]); + + register_subalias("20", m_CE1Q); + register_subalias("19", m_CE2); + + // register_subalias("13", m_FE1); + // register_subalias("11", m_FE2); + + register_subalias("18", m_STROBE); + + register_subalias("7", m_O[0]); + register_subalias("8", m_O[1]); + register_subalias("9", m_O[2]); + register_subalias("10", m_O[3]); + register_subalias("14", m_O[4]); + register_subalias("15", m_O[5]); + register_subalias("16", m_O[6]); + register_subalias("17", m_O[7]); + } + }; + + NETLIB_RESET(82S115) + { + m_last_O = 0; + } + + // FIXME: timing! + NETLIB_UPDATE(82S115) + { + unsigned o = 0; + + if (!m_CE1Q() && m_CE2()) + { + if (m_STROBE()) + { + unsigned a = 0; + for (std::size_t i=0; i<9; i++) + a |= (m_A[i]() << i); + + o = m_ROM[a]; + } + else + { + o = m_last_O; + } + } + + m_last_O = o; + + // 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, NLTIME_FROM_NS(40)); // FIXME: Timing + } + + NETLIB_DEVICE_IMPL(82S115) + NETLIB_DEVICE_IMPL(82S115_dip) + + } //namespace devices +} // namespace netlist |