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Diffstat (limited to 'src/lib/netlist/devices/nld_74165.cpp')
-rw-r--r--src/lib/netlist/devices/nld_74165.cpp142
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