summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/netlist/devices/nld_2102A.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/lib/netlist/devices/nld_2102A.cpp')
-rw-r--r--src/lib/netlist/devices/nld_2102A.cpp103
1 files changed, 103 insertions, 0 deletions
diff --git a/src/lib/netlist/devices/nld_2102A.cpp b/src/lib/netlist/devices/nld_2102A.cpp
new file mode 100644
index 00000000000..da8ffc3cc1d
--- /dev/null
+++ b/src/lib/netlist/devices/nld_2102A.cpp
@@ -0,0 +1,103 @@
+// license:BSD-3-Clause
+// copyright-holders:Ryan Holtz
+/*
+ * nld_2102A.cpp
+ *
+ */
+
+#include "nld_2102A.h"
+
+#define ADDR2BYTE(a) ((a) >> 3)
+#define ADDR2BIT(a) ((a) & 0x7)
+
+namespace netlist
+{
+ namespace devices
+ {
+ NETLIB_OBJECT(2102A)
+ {
+ NETLIB_CONSTRUCTOR(2102A)
+ , m_A(*this, {{"A0", "A1", "A2", "A3", "A4", "A5", "A6", "A7", "A8", "A9" }})
+ , m_CEQ(*this, "CEQ")
+ , m_RWQ(*this, "RWQ")
+ , m_DI(*this, "DI")
+ , m_DO(*this, "DO")
+ , m_ram(*this, "m_ram", 0)
+ , m_RAM(*this, "m_RAM", &m_ram[0])
+ {
+ }
+
+ NETLIB_RESETI();
+ NETLIB_UPDATEI();
+
+ protected:
+ object_array_t<logic_input_t, 10> m_A;
+ logic_input_t m_CEQ;
+ logic_input_t m_RWQ;
+ logic_input_t m_DI;
+
+ logic_output_t m_DO;
+
+ state_var<uint_fast8_t[128]> m_ram; // 1024x1 bits
+ param_ptr_t m_RAM;
+ };
+
+ NETLIB_OBJECT_DERIVED(2102A_dip, 2102A)
+ {
+ NETLIB_CONSTRUCTOR_DERIVED(2102A_dip, 2102A)
+ {
+ register_subalias("8", m_A[0]);
+ register_subalias("4", m_A[1]);
+ register_subalias("5", m_A[2]);
+ register_subalias("6", m_A[3]);
+ register_subalias("7", m_A[4]);
+ register_subalias("2", m_A[5]);
+ register_subalias("1", m_A[6]);
+ register_subalias("16", m_A[7]);
+ register_subalias("15", m_A[8]);
+ register_subalias("14", m_A[9]);
+
+ register_subalias("13", m_CEQ);
+ register_subalias("3", m_RWQ);
+
+ register_subalias("11", m_DI);
+ register_subalias("12", m_DO);
+ }
+ };
+
+ NETLIB_UPDATE(2102A)
+ {
+ netlist_time max_delay = NLTIME_FROM_NS(350);
+
+ if (!m_CEQ())
+ {
+ unsigned a = 0;
+ for (std::size_t i=0; i<10; i++)
+ {
+ a |= m_A[i]() << i;
+ }
+ const unsigned byte = ADDR2BYTE(a);
+ const unsigned bit = ADDR2BIT(a);
+
+ if (!m_RWQ())
+ {
+ m_ram[byte] &= ~(static_cast<uint_fast8_t>(1) << bit);
+ m_ram[byte] |= (static_cast<uint_fast8_t>(m_DI()) << bit);
+ }
+
+ m_DO.push((m_ram[byte] >> bit) & 1, max_delay);
+ }
+ }
+
+ NETLIB_RESET(2102A)
+ {
+ m_RAM.setTo(&m_ram[0]);
+ for (std::size_t i=0; i<128; i++)
+ m_ram[i] = 0;
+ }
+
+ NETLIB_DEVICE_IMPL(2102A)
+ NETLIB_DEVICE_IMPL(2102A_dip)
+
+ } //namespace devices
+} // namespace netlist