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// license:BSD-3-Clause
// copyright-holders:Raphael Nabet, Michael Zapf
/*
ATMEL AT29 family
Michael Zapf
August 2015
*/
#ifndef MAME_MACHINE_AT29X_H
#define MAME_MACHINE_AT29X_H
#pragma once
DECLARE_DEVICE_TYPE(AT29C020, at29c020_device)
DECLARE_DEVICE_TYPE(AT29C040, at29c040_device)
DECLARE_DEVICE_TYPE(AT29C040A, at29c040a_device)
class at29x_device : public device_t, public device_nvram_interface
{
public:
uint8_t read(offs_t offset);
void write(offs_t offset, uint8_t data);
protected:
at29x_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, int memory_size, int device_id, int sector_size);
virtual void device_start(void) override;
virtual void device_reset(void) override;
virtual void device_stop(void) override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param) override;
virtual void nvram_default() override;
virtual bool nvram_read(util::read_stream &file) override;
virtual bool nvram_write(util::write_stream &file) override;
int get_sector_number(offs_t address) { return address / m_sector_size; }
const int m_memory_size; // bytes
int m_word_width;
const int m_device_id;
const int m_sector_size;
int m_cycle_time; // ms
int m_boot_block_size;
int m_version;
int m_address_mask;
int m_sector_mask;
private:
enum s_cmd_t
{
CMD_0 = 0,
CMD_1,
CMD_2
};
enum s_pgm_t
{
PGM_0 = 0,
PGM_1,
PGM_2,
PGM_3
};
void sync_flags(void);
std::unique_ptr<uint8_t[]> m_eememory;
bool m_lower_bbl; // set when lower boot block lockout is enabled
bool m_higher_bbl; // set when upper boot block lockout is enabled
bool m_sdp; // set when in software data protect mode
bool m_id_mode; // set when in chip id mode
s_cmd_t m_cmd; // command state
bool m_enabling_bbl; // set when a boot block lockout command is expecting its parameter
bool m_long_sequence; // set if 0x80 command has just been executed (some command require this prefix)
s_pgm_t m_pgm; // programming state
bool m_enabling_sdb; // set when a sdp enable command is in progress
bool m_disabling_sdb; // set when a sdp disable command is in progress
bool m_toggle_bit; // indicates flashing in progress (toggles for each query)
std::unique_ptr<uint8_t[]> m_programming_buffer;
int m_programming_last_offset;
emu_timer* m_programming_timer;
};
/*
Variants
*/
class at29c020_device : public at29x_device
{
public:
at29c020_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
class at29c040_device : public at29x_device
{
public:
at29c040_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
class at29c040a_device : public at29x_device
{
public:
at29c040a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
};
#endif // MAME_MACHINE_AT29X_H
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