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// license:BSD-3-Clause
// copyright-holders:smf
/*
* x76f100.h
*
* Secure SerialFlash
*
*/
#pragma once
#ifndef __X76F100_H__
#define __X76F100_H__
#include "emu.h"
#define MCFG_X76F100_ADD( _tag ) \
MCFG_DEVICE_ADD( _tag, X76F100, 0 )
class x76f100_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
x76f100_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock );
DECLARE_WRITE_LINE_MEMBER( write_cs );
DECLARE_WRITE_LINE_MEMBER( write_rst );
DECLARE_WRITE_LINE_MEMBER( write_scl );
DECLARE_WRITE_LINE_MEMBER( write_sda );
DECLARE_READ_LINE_MEMBER( read_sda );
protected:
// device-level overrides
virtual void device_start();
// device_nvram_interface overrides
virtual void nvram_default();
virtual void nvram_read( emu_file &file );
virtual void nvram_write( emu_file &file );
private:
inline void verboselog(int n_level, const char *s_fmt, ...) ATTR_PRINTF(3,4);
UINT8 *password();
void password_ok();
int data_offset();
enum command_t
{
COMMAND_WRITE = 0x80,
COMMAND_READ = 0x81,
COMMAND_CHANGE_WRITE_PASSWORD = 0xfc,
COMMAND_CHANGE_READ_PASSWORD = 0xfe,
COMMAND_ACK_PASSWORD = 0x55
};
enum state_t
{
STATE_STOP,
STATE_RESPONSE_TO_RESET,
STATE_LOAD_COMMAND,
STATE_LOAD_PASSWORD,
STATE_VERIFY_PASSWORD,
STATE_READ_DATA,
STATE_WRITE_DATA
};
// internal state
int m_cs;
int m_rst;
int m_scl;
int m_sdaw;
int m_sdar;
int m_state;
int m_shift;
int m_bit;
int m_byte;
int m_command;
UINT8 m_write_buffer[ 8 ];
UINT8 m_response_to_reset[ 4 ];
UINT8 m_write_password[ 8 ];
UINT8 m_read_password[ 8 ];
UINT8 m_data[ 112 ];
};
// device type definition
extern const device_type X76F100;
#endif
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