diff options
Diffstat (limited to 'src/lib/netlist/devices/nld_74165.cpp')
-rw-r--r-- | src/lib/netlist/devices/nld_74165.cpp | 142 |
1 files changed, 63 insertions, 79 deletions
diff --git a/src/lib/netlist/devices/nld_74165.cpp b/src/lib/netlist/devices/nld_74165.cpp index 9e5d6607fbd..63fee9fdb13 100644 --- a/src/lib/netlist/devices/nld_74165.cpp +++ b/src/lib/netlist/devices/nld_74165.cpp @@ -3,36 +3,82 @@ /* * 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 "nld_74165.h" -#include "netlist/nl_base.h" -#include "nlid_system.h" +#include "nl_base.h" + +namespace netlist::devices { -namespace netlist -{ - namespace devices - { NETLIB_OBJECT(74165) { NETLIB_CONSTRUCTOR(74165) - , m_DATA(*this, {{ "H", "G", "F", "E", "D", "C", "B", "A" }}) - , m_SER(*this, "SER") - , m_SH_LDQ(*this, "SH_LDQ") - , m_CLK(*this, "CLK") - , m_CLKINH(*this, "CLKINH") + , 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_last_CLK(*this, "m_last_CLK", 0) , m_power_pins(*this) { } - NETLIB_RESETI(); - NETLIB_UPDATEI(); + 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(); + } - protected: + private: object_array_t<logic_input_t, 8> m_DATA; logic_input_t m_SER; logic_input_t m_SH_LDQ; @@ -42,72 +88,10 @@ namespace netlist logic_output_t m_QHQ; state_var<unsigned> m_shifter; - state_var<unsigned> m_last_CLK; nld_power_pins m_power_pins; }; - NETLIB_OBJECT_DERIVED(74165_dip, 74165) - { - NETLIB_CONSTRUCTOR_DERIVED(74165_dip, 74165) - { - register_subalias("1", m_SH_LDQ); - register_subalias("2", m_CLK); - register_subalias("3", m_DATA[4]); - register_subalias("4", m_DATA[5]); - register_subalias("5", m_DATA[6]); - register_subalias("6", m_DATA[7]); - register_subalias("7", m_QHQ); - register_subalias("8", "GND"); - - register_subalias("9", m_QH); - register_subalias("10", m_SER); - register_subalias("11", m_DATA[0]); - register_subalias("12", m_DATA[1]); - register_subalias("13", m_DATA[2]); - register_subalias("14", m_DATA[3]); - register_subalias("15", m_CLKINH); - register_subalias("16", "VCC"); - } - }; - - NETLIB_RESET(74165) - { - m_shifter = 0; - m_last_CLK = 0; - } - // FIXME: Timing - NETLIB_UPDATE(74165) - { - netlist_sig_t old_qh = m_QH.net().Q(); - netlist_sig_t qh = 0; - - if (!m_SH_LDQ()) - { - m_shifter = 0; - for (std::size_t i=0; i<8; i++) - m_shifter |= (m_DATA[i]() << i); - } - else if (!m_CLK() || m_CLKINH()) - { - // FIXME: qh is overwritten below? - qh = old_qh; - } - else if (!m_last_CLK) - { - unsigned high_bit = m_SER() ? 0x80 : 0; - m_shifter = high_bit | (m_shifter >> 1); - } - - qh = m_shifter & 1; - - m_last_CLK = m_CLK(); - - m_QH.push(qh, NLTIME_FROM_NS(20)); // FIXME: Timing - } - NETLIB_DEVICE_IMPL(74165, "TTL_74165", "+CLK,+CLKINH,+SH_LDQ,+SER,+A,+B,+C,+D,+E,+F,+G,+H,@VCC,@GND") - NETLIB_DEVICE_IMPL(74165_dip, "TTL_74165_DIP", "") - } //namespace devices -} // namespace netlist +} // namespace netlist::devices |