diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_2102A.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_2102A.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_2102A.cpp b/src/lib/netlist/devices/nld_2102A.cpp new file mode 100644 index 00000000000..da8ffc3cc1d --- /dev/null +++ b/src/lib/netlist/devices/nld_2102A.cpp @@ -0,0 +1,103 @@ +// license:BSD-3-Clause +// copyright-holders:Ryan Holtz +/* + * nld_2102A.cpp + * + */ + +#include "nld_2102A.h" + +#define ADDR2BYTE(a) ((a) >> 3) +#define ADDR2BIT(a) ((a) & 0x7) + +namespace netlist +{ + namespace devices + { + NETLIB_OBJECT(2102A) + { + NETLIB_CONSTRUCTOR(2102A) + , m_A(*this, {{"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9" }}) + , m_CEQ(*this, "CEQ") + , m_RWQ(*this, "RWQ") + , m_DI(*this, "DI") + , m_DO(*this, "DO") + , m_ram(*this, "m_ram", 0) + , m_RAM(*this, "m_RAM", &m_ram[0]) + { + } + + NETLIB_RESETI(); + NETLIB_UPDATEI(); + + protected: + object_array_t<logic_input_t, 10> m_A; + logic_input_t m_CEQ; + logic_input_t m_RWQ; + logic_input_t m_DI; + + logic_output_t m_DO; + + state_var<uint_fast8_t[128]> m_ram; // 1024x1 bits + param_ptr_t m_RAM; + }; + + NETLIB_OBJECT_DERIVED(2102A_dip, 2102A) + { + NETLIB_CONSTRUCTOR_DERIVED(2102A_dip, 2102A) + { + register_subalias("8", m_A[0]); + register_subalias("4", m_A[1]); + register_subalias("5", m_A[2]); + register_subalias("6", m_A[3]); + register_subalias("7", m_A[4]); + register_subalias("2", m_A[5]); + register_subalias("1", m_A[6]); + register_subalias("16", m_A[7]); + register_subalias("15", m_A[8]); + register_subalias("14", m_A[9]); + + register_subalias("13", m_CEQ); + register_subalias("3", m_RWQ); + + register_subalias("11", m_DI); + register_subalias("12", m_DO); + } + }; + + NETLIB_UPDATE(2102A) + { + netlist_time max_delay = NLTIME_FROM_NS(350); + + if (!m_CEQ()) + { + unsigned a = 0; + for (std::size_t i=0; i<10; i++) + { + a |= m_A[i]() << i; + } + const unsigned byte = ADDR2BYTE(a); + const unsigned bit = ADDR2BIT(a); + + if (!m_RWQ()) + { + m_ram[byte] &= ~(static_cast<uint_fast8_t>(1) << bit); + m_ram[byte] |= (static_cast<uint_fast8_t>(m_DI()) << bit); + } + + m_DO.push((m_ram[byte] >> bit) & 1, max_delay); + } + } + + NETLIB_RESET(2102A) + { + m_RAM.setTo(&m_ram[0]); + for (std::size_t i=0; i<128; i++) + m_ram[i] = 0; + } + + NETLIB_DEVICE_IMPL(2102A) + NETLIB_DEVICE_IMPL(2102A_dip) + + } //namespace devices +} // namespace netlist |