// license:BSD-3-Clause // copyright-holders:Ryan Holtz /* * nld_74165.cpp * * 74165: Parallel-Load 8-Bit Shift Register * * +--------------+ * SH/LDQ |1 ++ 16| VCC * CLK |2 15| CLKINH * E |3 14| D * F |4 74165 13| C * G |5 12| B * H |6 11| A * QHQ |7 10| SER * GND |8 9| QH * +--------------+ * * SH/LDQ: Shift / !Load * CLKINH: Clock Inhibit * SER: Serial In * * Naming convention attempts to follow NTE Electronics datasheet * */ #include "nl_base.h" namespace netlist::devices { NETLIB_OBJECT(74165) { NETLIB_CONSTRUCTOR(74165) , m_DATA(*this, { "H", "G", "F", "E", "D", "C", "B", "A" }, NETLIB_DELEGATE(inputs)) , m_SER(*this, "SER", NETLIB_DELEGATE_NOOP()) , m_SH_LDQ(*this, "SH_LDQ", NETLIB_DELEGATE(inputs)) , m_CLK(*this, "CLK", NETLIB_DELEGATE(clk)) , m_CLKINH(*this, "CLKINH", NETLIB_DELEGATE(inputs)) , m_QH(*this, "QH") , m_QHQ(*this, "QHQ") , m_shifter(*this, "m_shifter", 0) , m_power_pins(*this) { } NETLIB_RESETI() { m_CLK.set_state(logic_t::STATE_INP_LH); m_shifter = 0; } NETLIB_HANDLERI(clk) { unsigned high_bit = m_SER() ? 0x80 : 0; m_shifter = high_bit | (m_shifter >> 1); const auto qh = m_shifter & 1; m_QH.push(qh, NLTIME_FROM_NS(20)); // FIXME: Timing m_QHQ.push(qh ^ 1, NLTIME_FROM_NS(20)); // FIXME: Timing } NETLIB_HANDLERI(inputs) { if (!m_SH_LDQ()) { m_shifter = 0; for (std::size_t i=0; i<8; i++) m_shifter |= (m_DATA[i]() << i); const auto qh = m_shifter & 1; m_QH.push(qh, NLTIME_FROM_NS(20)); // FIXME: Timing m_QHQ.push(qh ^ 1, NLTIME_FROM_NS(20)); // FIXME: Timing } if (!m_SH_LDQ() || m_CLKINH()) m_CLK.inactivate(); else m_CLK.activate_lh(); } private: object_array_t m_DATA; logic_input_t m_SER; logic_input_t m_SH_LDQ; logic_input_t m_CLK; logic_input_t m_CLKINH; logic_output_t m_QH; logic_output_t m_QHQ; state_var m_shifter; nld_power_pins m_power_pins; }; // FIXME: Timing NETLIB_DEVICE_IMPL(74165, "TTL_74165", "+CLK,+CLKINH,+SH_LDQ,+SER,+A,+B,+C,+D,+E,+F,+G,+H,@VCC,@GND") } // namespace netlist::devices