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Diffstat (limited to 'src/lib/netlist/devices/nld_82S123.cpp')
-rw-r--r--src/lib/netlist/devices/nld_82S123.cpp83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_82S123.cpp b/src/lib/netlist/devices/nld_82S123.cpp
new file mode 100644
index 00000000000..f9e97174d4a
--- /dev/null
+++ b/src/lib/netlist/devices/nld_82S123.cpp
@@ -0,0 +1,83 @@
+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*
+ * nld_82S123.cpp
+ *
+ */
+
+#include "nld_82S123.h"
+
+namespace netlist
+{
+ namespace devices
+ {
+ NETLIB_OBJECT(82S123)
+ {
+ NETLIB_CONSTRUCTOR(82S123)
+ , m_A(*this, {{"A0", "A1", "A2", "A3", "A4"}})
+ , m_CEQ(*this, "CEQ")
+ , m_O(*this, {{"O1", "O2", "O3", "O4", "O5", "O6", "O7", "O8"}})
+ , m_ROM(*this, "ROM")
+ {
+ }
+
+ NETLIB_UPDATEI();
+
+ protected:
+ object_array_t<logic_input_t, 5> m_A;
+ logic_input_t m_CEQ;
+ object_array_t<logic_output_t, 8> m_O;
+
+ param_rom_t<uint8_t, 5, 8> m_ROM; // 256 bits, 32x8
+ };
+
+ NETLIB_OBJECT_DERIVED(82S123_dip, 82S123)
+ {
+ NETLIB_CONSTRUCTOR_DERIVED(82S123_dip, 82S123)
+ {
+ register_subalias("1", m_O[0]);
+ register_subalias("2", m_O[1]);
+ register_subalias("3", m_O[2]);
+ register_subalias("4", m_O[3]);
+ register_subalias("5", m_O[4]);
+ register_subalias("6", m_O[5]);
+ register_subalias("7", m_O[6]);
+ register_subalias("8", m_O[7]);
+
+ register_subalias("15", m_CEQ);
+
+ register_subalias("10", m_A[0]);
+ register_subalias("11", m_A[1]);
+ register_subalias("12", m_A[2]);
+ register_subalias("13", m_A[3]);
+ register_subalias("14", m_A[4]);
+ }
+ };
+
+ // FIXME: timing!
+ NETLIB_UPDATE(82S123)
+ {
+ unsigned o = 0xff;
+
+ netlist_time delay = NLTIME_FROM_NS(35);
+ if (!m_CEQ())
+ {
+ unsigned a = 0;
+ for (std::size_t i=0; i<5; i++)
+ a |= (m_A[i]() << i);
+
+ o = m_ROM[a];
+
+ delay = NLTIME_FROM_NS(50);
+ }
+
+ // FIXME: Outputs are tristate. This needs to be properly implemented
+ for (std::size_t i=0; i<8; i++)
+ m_O[i].push((o >> i) & 1, delay);
+ }
+
+ NETLIB_DEVICE_IMPL(82S123)
+ NETLIB_DEVICE_IMPL(82S123_dip)
+
+ } //namespace devices
+} // namespace netlist