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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* nld_7474.h
*
* DM7474: Dual Positive-Edge-Triggered D Flip-Flops
* with Preset, Clear and Complementary Outputs
*
* +--------------+
* CLR1 |1 ++ 14| VCC
* D1 |2 13| CLR2
* CLK1 |3 12| D2
* PR1 |4 7474 11| CLK2
* Q1 |5 10| PR2
* Q1Q |6 9| Q2
* GND |7 8| Q2Q
* +--------------+
*
* +-----+-----+-----+---++---+-----+
* | PR | CLR | CLK | D || Q | QQ |
* +=====+=====+=====+===++===+=====+
* | 0 | 1 | X | X || 1 | 0 |
* | 1 | 0 | X | X || 0 | 1 |
* | 0 | 0 | X | X || 1 | 1 | (*)
* | 1 | 1 | R | 1 || 1 | 0 |
* | 1 | 1 | R | 0 || 0 | 1 |
* | 1 | 1 | 0 | X || Q0| Q0Q |
* +-----+-----+-----+---++---+-----+
*
* (*) This configuration is not stable, i.e. it will not persist
* when either the preset and or clear inputs return to their inactive (high) level
*
* Q0 The output logic level of Q before the indicated input conditions were established
*
* R: 0 --> 1
*
* Naming conventions follow National Semiconductor datasheet
*
* FIXME: Check that (*) is emulated properly
*/
#ifndef NLD_7474_H_
#define NLD_7474_H_
#include "nld_signal.h"
#define TTL_7474(_name, _CLK, _D, _CLRQ, _PREQ) \
NET_REGISTER_DEV(7474, _name) \
NET_CONNECT(_name, CLK, _CLK) \
NET_CONNECT(_name, D, _D) \
NET_CONNECT(_name, CLRQ, _CLRQ) \
NET_CONNECT(_name, PREQ, _PREQ)
#define TTL_7474_DIP(_name) \
NET_REGISTER_DEV(7474_dip, _name)
NETLIB_SUBDEVICE(7474sub,
netlist_ttl_input_t m_CLK;
netlist_state_t<UINT8> m_nextD;
netlist_ttl_output_t m_Q;
netlist_ttl_output_t m_QQ;
ATTR_HOT inline void newstate(const UINT8 stateQ, const UINT8 stateQQ);
);
NETLIB_DEVICE(7474,
public:
NETLIB_NAME(7474sub) sub;
netlist_ttl_input_t m_D;
netlist_ttl_input_t m_CLRQ;
netlist_ttl_input_t m_PREQ;
);
NETLIB_DEVICE(7474_dip,
NETLIB_NAME(7474) m_1;
NETLIB_NAME(7474) m_2;
);
#endif /* NLD_7474_H_ */
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