diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_7485.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_7485.cpp | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_7485.cpp b/src/lib/netlist/devices/nld_7485.cpp new file mode 100644 index 00000000000..ba51756cac1 --- /dev/null +++ b/src/lib/netlist/devices/nld_7485.cpp @@ -0,0 +1,107 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_7485.cpp + * + */ + +#include "nld_7485.h" + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(7485) + { + NETLIB_CONSTRUCTOR(7485) + , m_A(*this, {{"A0", "A1", "A2", "A3"}}) + , m_B(*this, {{"B0", "B1", "B2", "B3"}}) + , m_LTIN(*this, "LTIN") + , m_EQIN(*this, "EQIN") + , m_GTIN(*this, "GTIN") + , m_LTOUT(*this, "LTOUT") + , m_EQOUT(*this, "EQOUT") + , m_GTOUT(*this, "GTOUT") + { + } + + NETLIB_UPDATEI(); + + void update_outputs(unsigned gt, unsigned lt, unsigned eq); + + protected: + object_array_t<logic_input_t, 4> m_A; + object_array_t<logic_input_t, 4> m_B; + logic_input_t m_LTIN; + logic_input_t m_EQIN; + logic_input_t m_GTIN; + logic_output_t m_LTOUT; + logic_output_t m_EQOUT; + logic_output_t m_GTOUT; + }; + + NETLIB_OBJECT_DERIVED(7485_dip, 7485) + { + NETLIB_CONSTRUCTOR_DERIVED(7485_dip, 7485) + { + register_subalias("1", m_B[3]); + register_subalias("2", m_LTIN); + register_subalias("3", m_EQIN); + register_subalias("4", m_GTIN); + register_subalias("5", m_GTOUT); + register_subalias("6", m_EQOUT); + register_subalias("7", m_LTOUT); + + register_subalias("9", m_B[0]); + register_subalias("10", m_A[0]); + register_subalias("11", m_B[1]); + register_subalias("12", m_A[1]); + register_subalias("13", m_A[2]); + register_subalias("14", m_B[2]); + register_subalias("15", m_A[3]); + + } + }; + + void NETLIB_NAME(7485)::update_outputs(unsigned gt, unsigned lt, unsigned eq) + { + m_GTOUT.push(gt, NLTIME_FROM_NS(23)); + m_LTOUT.push(lt, NLTIME_FROM_NS(23)); + m_EQOUT.push(eq, NLTIME_FROM_NS(23)); + } + + // FIXME: Timing + NETLIB_UPDATE(7485) + { + for (std::int_fast32_t i = 3; i >= 0; i--) + { + if (m_A[i]() > m_B[i]()) + { + update_outputs(1, 0, 0); + return; + } + else if (m_A[i]() < m_B[i]()) + { + update_outputs(0, 1, 0); + return; + } + } + + // must be == if we got here + if (m_EQIN()) + update_outputs(0, 0, 1); + else if (m_GTIN() && m_LTIN()) + update_outputs(0, 0, 0); + else if (m_GTIN()) + update_outputs(1, 0, 0); + else if (m_LTIN()) + update_outputs(0, 1, 0); + else + update_outputs(1, 1, 0); + } + + NETLIB_DEVICE_IMPL(7485) + NETLIB_DEVICE_IMPL(7485_dip) + + } //namespace devices +} // namespace netlist |