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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
er2055.h
GI 512 bit electrically alterable read-only memory.
***************************************************************************/
#pragma once
#ifndef __ER2055_H__
#define __ER2055_H__
//**************************************************************************
// 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 clock);
// I/O operations
UINT8 data() const { return m_data; }
void set_address(UINT8 address) { m_address = address & 0x3f; }
void set_data(UINT8 data) { m_data = data; }
// control lines -- all lines are specified as active-high (even CS2)
void set_control(UINT8 cs1, UINT8 cs2, UINT8 c1, UINT8 c2, UINT8 ck);
protected:
// device-level overrides
virtual void device_start();
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
// device_nvram_interface overrides
virtual void nvram_default();
virtual void nvram_read(emu_file &file);
virtual void nvram_write(emu_file &file);
static const int SIZE_DATA = 0x40;
static const UINT8 CK = 0x01;
static const UINT8 C1 = 0x02;
static const UINT8 C2 = 0x04;
static const UINT8 CS1 = 0x08;
static const UINT8 CS2 = 0x10;
// configuration state
address_space_config m_space_config;
// internal state
UINT8 m_control_state;
UINT8 m_address;
UINT8 m_data;
};
// device type definition
extern const device_type ER2055;
#endif
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