diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_2716.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_2716.cpp | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_2716.cpp b/src/lib/netlist/devices/nld_2716.cpp new file mode 100644 index 00000000000..7ba974b92da --- /dev/null +++ b/src/lib/netlist/devices/nld_2716.cpp @@ -0,0 +1,98 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_2716.cpp + * + */ + +#include "nld_2716.h" + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(2716) + { + NETLIB_CONSTRUCTOR(2716) + , m_A(*this, {{ "A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9", "A10" }}) + , m_GQ(*this, "GQ") + , m_EPQ(*this, "EPQ") + , m_D(*this, {{ "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7" }}) + , m_last_EPQ(*this, "m_last_EPQ", 1) + , m_ROM(*this, "ROM") + { + } + + NETLIB_UPDATEI(); + + protected: + object_array_t<logic_input_t, 11> m_A; + logic_input_t m_GQ; + logic_input_t m_EPQ; + object_array_t<logic_output_t, 8> m_D; + + state_var<unsigned> m_last_EPQ; + + param_rom_t<uint8_t, 11, 8> m_ROM; // 16 Kbits, used as 2 Kbit x 8 + }; + + NETLIB_OBJECT_DERIVED(2716_dip, 2716) + { + NETLIB_CONSTRUCTOR_DERIVED(2716_dip, 2716) + { + register_subalias("8", m_A[0]); + register_subalias("7", m_A[1]); + register_subalias("6", m_A[2]); + register_subalias("5", m_A[3]); + register_subalias("4", m_A[4]); + register_subalias("3", m_A[5]); + register_subalias("2", m_A[6]); + register_subalias("1", m_A[7]); + register_subalias("23", m_A[8]); + register_subalias("22", m_A[9]); + register_subalias("19", m_A[10]); + + register_subalias("20", m_GQ); + register_subalias("18", m_EPQ); + + register_subalias("9", m_D[0]); + register_subalias("10", m_D[1]); + register_subalias("11", m_D[2]); + register_subalias("13", m_D[3]); + register_subalias("14", m_D[4]); + register_subalias("15", m_D[5]); + register_subalias("16", m_D[6]); + register_subalias("17", m_D[7]); + } + }; + + // FIXME: timing! + NETLIB_UPDATE(2716) + { + unsigned d = 0xff; + + netlist_time delay = NLTIME_FROM_NS(450); + if (!m_GQ() && !m_EPQ()) + { + unsigned a = 0; + for (std::size_t i=0; i<11; i++) + a |= (m_A[i]() << i); + + d = m_ROM[a]; + + if (m_last_EPQ) + delay = NLTIME_FROM_NS(120); + } + + m_last_EPQ = m_EPQ(); + + // FIXME: Outputs are tristate. This needs to be properly implemented + for (std::size_t i=0; i<8; i++) + m_D[i].push((d >> i) & 1, delay); + } + + NETLIB_DEVICE_IMPL(2716) + NETLIB_DEVICE_IMPL(2716_dip) + + } //namespace devices +} // namespace netlist |