diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_82s115.cpp')
-rwxr-xr-x | src/lib/netlist/devices/nld_82s115.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_82s115.cpp b/src/lib/netlist/devices/nld_82s115.cpp new file mode 100755 index 00000000000..f1e49bd9f83 --- /dev/null +++ b/src/lib/netlist/devices/nld_82s115.cpp @@ -0,0 +1,97 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_82S115.cpp + * + * 82S115: 4K-bit TTL bipolar PROM (512 x 8) + * + * +--------------+ + * A3 |1 ++ 24| VCC + * A4 |2 23| A2 + * A5 |3 22| A1 + * A6 |4 82S115 21| A0 + * A7 |5 20| CE1Q + * A8 |6 19| CE2 + * O1 |7 18| STROBE + * O2 |8 17| O8 + * O3 |9 16| O7 + * O4 |10 15| O6 + * FE2 |11 14| O5 + * GND |12 13| FE1 + * +--------------+ + * + * + * Naming conventions follow Signetics datasheet + * + */ + +#include "nl_base.h" + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(82S115) + { + NETLIB_CONSTRUCTOR(82S115) + , m_A(*this, {"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8"}, NETLIB_DELEGATE(inputs)) + , m_CE1Q(*this, "CE1Q", NETLIB_DELEGATE(inputs)) + , m_CE2(*this, "CE2", NETLIB_DELEGATE(inputs)) + , m_STROBE(*this, "STROBE", NETLIB_DELEGATE(inputs)) + , m_O(*this, {"O1", "O2", "O3", "O4", "O5", "O6", "O7", "O8"}) + , m_last_O(*this, "m_last_O", 0) + , m_ROM(*this, "ROM") + , m_power_pins(*this) + { + } + + NETLIB_RESETI() + { + m_last_O = 0; + } + + private: + // FIXME: timing! + NETLIB_HANDLERI(inputs) + { + 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 + } + + 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 + nld_power_pins m_power_pins; + }; + + NETLIB_DEVICE_IMPL(82S115, "PROM_82S115", "+CE1Q,+CE2,+A0,+A1,+A2,+A3,+A4,+A5,+A6,+A7,+A8,+STROBE,@VCC,@GND") + + } //namespace devices +} // namespace netlist |