diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_7442.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_7442.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_7442.cpp b/src/lib/netlist/devices/nld_7442.cpp new file mode 100644 index 00000000000..7e952428b88 --- /dev/null +++ b/src/lib/netlist/devices/nld_7442.cpp @@ -0,0 +1,104 @@ +// license:GPL-2.0+ +// copyright-holders:Ryan Holtz +/* + * nld_7442.cpp + * + */ + +#include "nld_7442.h" +#include "netlist/nl_base.h" +#include "nlid_system.h" + +namespace netlist +{ +namespace devices +{ + static C14CONSTEXPR const netlist_time delay = NLTIME_FROM_NS(30); // Worst-case through 3 levels of logic + + NETLIB_OBJECT(7442) + { + NETLIB_CONSTRUCTOR(7442) + , m_A(*this, "A") + , m_B(*this, "B") + , m_C(*this, "C") + , m_D(*this, "D") + , m_val(*this, "m_val", 0) + , m_last_val(*this, "m_last_val", 0) + , m_Q(*this, {{"Q0", "Q1", "Q2", "Q3", "Q4", "Q5", "Q6", "Q7", "Q8", "Q9"}}) + , m_power_pins(*this) + { + } + + private: + NETLIB_UPDATEI(); + NETLIB_RESETI(); + + void update_outputs() noexcept + { + for (std::size_t i=0; i<10; i++) + m_Q[i].push(i == m_val ? 0 : 1, delay); + } + + logic_input_t m_A; + logic_input_t m_B; + logic_input_t m_C; + logic_input_t m_D; + + state_var_u8 m_val; + state_var_u8 m_last_val; + + object_array_t<logic_output_t, 10> m_Q; + nld_power_pins m_power_pins; + }; + + NETLIB_OBJECT_DERIVED(7442_dip, 7442) + { + NETLIB_CONSTRUCTOR_DERIVED(7442_dip, 7442) + { + register_subalias("1", "Q0"); + register_subalias("2", "Q1"); + register_subalias("3", "Q2"); + register_subalias("4", "Q3"); + register_subalias("5", "Q4"); + register_subalias("6", "Q5"); + register_subalias("7", "Q6"); + register_subalias("8", "GND"); + + register_subalias("9", "Q7"); + register_subalias("10", "Q8"); + register_subalias("11", "Q9"); + register_subalias("12", "D"); + register_subalias("13", "C"); + register_subalias("14", "B"); + register_subalias("15", "A"); + register_subalias("16", "VCC"); + } + }; + + NETLIB_RESET(7442) + { + m_val = 0; + m_last_val = 0; + } + + NETLIB_UPDATE(7442) + { + const netlist_sig_t new_A = m_A(); + const netlist_sig_t new_B = m_B(); + const netlist_sig_t new_C = m_C(); + const netlist_sig_t new_D = m_D(); + + m_last_val = m_val; + m_val = (new_D << 3) | (new_C << 2) | (new_B << 1) | new_A; + + if (m_last_val != m_val) + { + update_outputs(); + } + } + + NETLIB_DEVICE_IMPL(7442, "TTL_7442", "+A,+B,+C,+D,@VCC,@GND") + NETLIB_DEVICE_IMPL(7442_dip, "TTL_7442_DIP", "") + +} // namespace devices +} // namespace netlist |