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Diffstat (limited to 'src/lib/netlist/devices/nld_82S115.cpp')
-rw-r--r--src/lib/netlist/devices/nld_82S115.cpp112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_82S115.cpp b/src/lib/netlist/devices/nld_82S115.cpp
new file mode 100644
index 00000000000..c01d013aec5
--- /dev/null
+++ b/src/lib/netlist/devices/nld_82S115.cpp
@@ -0,0 +1,112 @@
+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*
+ * nld_82S115.cpp
+ *
+ */
+
+#include "nld_82S115.h"
+
+namespace netlist
+{
+ namespace devices
+ {
+ NETLIB_OBJECT(82S115)
+ {
+ NETLIB_CONSTRUCTOR(82S115)
+ , m_A(*this, {{"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8"}})
+ , m_CE1Q(*this, "CE1Q")
+ , m_CE2(*this, "CE2")
+ , m_STROBE(*this, "STROBE")
+ , m_O(*this, {{"O1", "O2", "O3", "O4", "O5", "O6", "O7", "O8"}})
+ , m_last_O(*this, "m_last_O", 0)
+ , m_ROM(*this, "ROM")
+ {
+ }
+
+ NETLIB_RESETI();
+ NETLIB_UPDATEI();
+
+ protected:
+ object_array_t<logic_input_t, 9> m_A;
+ logic_input_t m_CE1Q;
+ logic_input_t m_CE2;
+ logic_input_t m_STROBE;
+ object_array_t<logic_output_t, 8> m_O;
+
+ state_var<unsigned> m_last_O;
+
+ param_rom_t<uint8_t, 9, 8> m_ROM; // 4096 bits, 512x8
+ };
+
+ NETLIB_OBJECT_DERIVED(82S115_dip, 82S115)
+ {
+ NETLIB_CONSTRUCTOR_DERIVED(82S115_dip, 82S115)
+ {
+ register_subalias("21", m_A[0]);
+ register_subalias("22", m_A[1]);
+ register_subalias("23", m_A[2]);
+ register_subalias("1", m_A[3]);
+ register_subalias("2", m_A[4]);
+ register_subalias("3", m_A[5]);
+ register_subalias("4", m_A[6]);
+ register_subalias("5", m_A[7]);
+ register_subalias("6", m_A[8]);
+
+ register_subalias("20", m_CE1Q);
+ register_subalias("19", m_CE2);
+
+ // register_subalias("13", m_FE1);
+ // register_subalias("11", m_FE2);
+
+ register_subalias("18", m_STROBE);
+
+ register_subalias("7", m_O[0]);
+ register_subalias("8", m_O[1]);
+ register_subalias("9", m_O[2]);
+ register_subalias("10", m_O[3]);
+ register_subalias("14", m_O[4]);
+ register_subalias("15", m_O[5]);
+ register_subalias("16", m_O[6]);
+ register_subalias("17", m_O[7]);
+ }
+ };
+
+ NETLIB_RESET(82S115)
+ {
+ m_last_O = 0;
+ }
+
+ // FIXME: timing!
+ NETLIB_UPDATE(82S115)
+ {
+ unsigned o = 0;
+
+ if (!m_CE1Q() && m_CE2())
+ {
+ if (m_STROBE())
+ {
+ unsigned a = 0;
+ for (std::size_t i=0; i<9; i++)
+ a |= (m_A[i]() << i);
+
+ o = m_ROM[a];
+ }
+ else
+ {
+ o = m_last_O;
+ }
+ }
+
+ m_last_O = o;
+
+ // 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, NLTIME_FROM_NS(40)); // FIXME: Timing
+ }
+
+ NETLIB_DEVICE_IMPL(82S115)
+ NETLIB_DEVICE_IMPL(82S115_dip)
+
+ } //namespace devices
+} // namespace netlist