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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
er2055.h
GI 512 bit electrically alterable read-only memory.
***************************************************************************/
#ifndef MAME_MACHINE_ER2055_H
#define MAME_MACHINE_ER2055_H
#pragma once
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_ER2055_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, ER2055, 0)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> er2055_device
class er2055_device : public device_t,
public device_memory_interface,
public device_nvram_interface
{
public:
// construction/destruction
er2055_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// 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, uint8_t ck);
protected:
// device-level overrides
virtual void device_start() override;
// device_memory_interface overrides
virtual space_config_vector memory_space_config() const 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:
static const int SIZE_DATA = 0x40;
static const uint8_t CK = 0x01;
static const uint8_t C1 = 0x02;
static const uint8_t C2 = 0x04;
static const uint8_t CS1 = 0x08;
static const uint8_t CS2 = 0x10;
optional_memory_region m_region;
// configuration state
address_space_config m_space_config;
// internal state
uint8_t m_control_state;
uint8_t m_address;
uint8_t m_data;
void er2055_map(address_map &map);
};
// device type definition
DECLARE_DEVICE_TYPE(ER2055, er2055_device)
#endif // MAME_MACHINE_ER2055_H
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