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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* nld_7493.cpp
*
* DM7493: Binary Counters
*
* +--------------+
* B |1 ++ 14| A
* R01 |2 13| NC
* R02 |3 12| QA
* NC |4 7493 11| QD
* VCC |5 10| GND
* NC |6 9| QB
* NC |7 8| QC
* +--------------+
*
* Counter Sequence
*
* +-------++----+----+----+----+
* | COUNT || QD | QC | QB | QA |
* +=======++====+====+====+====+
* | 0 || 0 | 0 | 0 | 0 |
* | 1 || 0 | 0 | 0 | 1 |
* | 2 || 0 | 0 | 1 | 0 |
* | 3 || 0 | 0 | 1 | 1 |
* | 4 || 0 | 1 | 0 | 0 |
* | 5 || 0 | 1 | 0 | 1 |
* | 6 || 0 | 1 | 1 | 0 |
* | 7 || 0 | 1 | 1 | 1 |
* | 8 || 1 | 0 | 0 | 0 |
* | 9 || 1 | 0 | 0 | 1 |
* | 10 || 1 | 0 | 1 | 0 |
* | 11 || 1 | 0 | 1 | 1 |
* | 12 || 1 | 1 | 0 | 0 |
* | 13 || 1 | 1 | 0 | 1 |
* | 14 || 1 | 1 | 1 | 0 |
* | 15 || 1 | 1 | 1 | 1 |
* +-------++----+----+----+----+
*
* Note C Output QA is connected to input B
*
* Reset Count Function table
*
* +-----+-----++----+----+----+----+
* | R01 | R02 || QD | QC | QB | QA |
* +=====+=====++====+====+====+====+
* | 1 | 1 || 0 | 0 | 0 | 0 |
* | 0 | X || COUNT |
* | X | 0 || COUNT |
* +-----+-----++----+----+----+----+
*
* Naming conventions follow National Semiconductor datasheet
*
*/
#include "nld_7493.h"
#include "nl_base.h"
namespace netlist
{
namespace devices
{
static constexpr const netlist_time out_delay = NLTIME_FROM_NS(18);
static constexpr const netlist_time out_delay2 = NLTIME_FROM_NS(36);
static constexpr const netlist_time out_delay3 = NLTIME_FROM_NS(54);
NETLIB_OBJECT(7493)
{
NETLIB_CONSTRUCTOR(7493)
, m_R1(*this, "R1", NETLIB_DELEGATE(inputs))
, m_R2(*this, "R2", NETLIB_DELEGATE(inputs))
, m_a(*this, "_m_a", 0)
, m_bcd(*this, "_m_b", 0)
, m_r(*this, "_m_r", 0)
, m_CLKA(*this, "CLKA", NETLIB_DELEGATE(updA))
, m_CLKB(*this, "CLKB", NETLIB_DELEGATE(updB))
, m_QA(*this, "QA")
, m_QB(*this, {"QB", "QC", "QD"})
, m_power_pins(*this)
{
}
private:
NETLIB_RESETI()
{
m_a = m_bcd = 0;
m_CLKA.set_state(logic_t::STATE_INP_HL);
m_CLKB.set_state(logic_t::STATE_INP_HL);
}
NETLIB_HANDLERI(inputs)
{
if (!(m_R1() && m_R2()))
{
m_CLKA.activate_hl();
m_CLKB.activate_hl();
}
else
{
m_CLKA.inactivate();
m_CLKB.inactivate();
m_QA.push(0, NLTIME_FROM_NS(40));
m_QB.push(0, NLTIME_FROM_NS(40));
m_a = m_bcd = 0;
}
}
NETLIB_HANDLERI(updA)
{
m_a ^= 1;
m_QA.push(m_a, out_delay);
}
NETLIB_HANDLERI(updB)
{
const auto cnt(++m_bcd &= 0x07);
m_QB[2].push((cnt >> 2) & 1, out_delay3);
m_QB[1].push((cnt >> 1) & 1, out_delay2);
m_QB[0].push(cnt & 1, out_delay);
}
logic_input_t m_R1;
logic_input_t m_R2;
state_var_sig m_a;
state_var_sig m_bcd;
state_var_sig m_r;
logic_input_t m_CLKA;
logic_input_t m_CLKB;
logic_output_t m_QA;
object_array_t<logic_output_t, 3> m_QB;
nld_power_pins m_power_pins;
};
NETLIB_DEVICE_IMPL(7493, "TTL_7493", "+CLKA,+CLKB,+R1,+R2,@VCC,@GND")
} // namespace devices
} // namespace netlist
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