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// license:BSD-3-Clause
// copyright-holders:AJR
/***************************************************************************
GI ER1400 1400 Bit Serial Electrically Alterable Read-Only Memory
****************************************************************************
____ ____
(0) Vss 1 |* \_/ | 14 Vm (N.C.)
(-35) Vgg 2 | | 13 N.C.
N.C. 3 | | 12 Data I/O
N.C. 4 | ER 1400 | 11 N.C.
N.C. 5 | | 10 N.C.
Clock 6 | | 9 C3
C1 7 |___________| 8 C2
***************************************************************************/
#ifndef MAME_MACHINE_ER1400_H
#define MAME_MACHINE_ER1400_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> er1400_device
class er1400_device : public device_t, public device_nvram_interface
{
public:
// construction/destruction
er1400_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
// line handlers
DECLARE_WRITE_LINE_MEMBER(data_w);
DECLARE_WRITE_LINE_MEMBER(c1_w);
DECLARE_WRITE_LINE_MEMBER(c2_w);
DECLARE_WRITE_LINE_MEMBER(c3_w);
DECLARE_WRITE_LINE_MEMBER(clock_w);
DECLARE_READ_LINE_MEMBER(data_r);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual void nvram_read(emu_file &file) override;
virtual void nvram_write(emu_file &file) override;
private:
enum
{
PROPAGATION_TIMER
};
// logging helper
std::string address_binary_format() const;
// internal helpers
void read_data();
void write_data();
void erase_data();
// nonvolatile data
std::unique_ptr<u16[]> m_data_array;
// input and output line states
bool m_clock_input;
u8 m_code_input;
bool m_data_input;
bool m_data_output;
// timing
attotime m_write_time;
attotime m_erase_time;
emu_timer *m_data_propagation_timer;
// internal registers
u16 m_data_register;
u32 m_address_register;
};
// device type definition
DECLARE_DEVICE_TYPE(ER1400, er1400_device)
#endif // MAME_DEVICES_MACHINE_ER1400_H
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