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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
er2055.h
GI 512 bit electrically alterable read-only memory.
****************************************************************************
_____ _____
D3 1 |* \_/ | 22 D2
D7 2 | | 21 D1
D6 3 | | 20 D0
D5 4 | | 19 Vgi (GND)
D4 5 | | 18 CS2
Vss (+5V) 6 | ER-2055 | 17 CS1
A5 7 | | 16 C2
A4 8 | | 15 C1
A3 9 | | 14 Vgg (-28V)
A2 10 | | 13 CLK
A1 11 |_____________| 12 A0
***************************************************************************/
#ifndef MAME_MACHINE_ER2055_H
#define MAME_MACHINE_ER2055_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> er2055_device
class er2055_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
er2055_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL());
// I/O operations
uint8_t data() const { return m_data; }
void set_address(uint8_t address) { m_address = address & 0x3f; }
void set_data(uint8_t data) { m_data = data; }
// control lines -- all lines are specified as active-high (even CS2)
void set_control(uint8_t cs1, uint8_t cs2, uint8_t c1, uint8_t c2);
DECLARE_WRITE_LINE_MEMBER(set_clk);
protected:
// device-level overrides
virtual void device_start() override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
private:
void update_state();
static constexpr int SIZE_DATA = 0x40;
static constexpr uint8_t CK = 0x01;
static constexpr uint8_t C1 = 0x02;
static constexpr uint8_t C2 = 0x04;
static constexpr uint8_t CS1 = 0x08;
static constexpr uint8_t CS2 = 0x10;
optional_region_ptr<uint8_t> m_default_data;
// internal state
uint8_t m_control_state;
uint8_t m_address;
uint8_t m_data;
std::unique_ptr<uint8_t[]> m_rom_data;
};
// device type definition
DECLARE_DEVICE_TYPE(ER2055, er2055_device)
#endif // MAME_MACHINE_ER2055_H
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