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// license:BSD-3-Clause
// copyright-holders:smf
/*
* ds1204.h
*
* Electronic Key
*
*/
#pragma once
#ifndef __DS1204_H__
#define __DS1204_H__
#include "emu.h"
#define MCFG_DS1204_ADD( _tag ) \
MCFG_DEVICE_ADD( _tag, DS1204, 0 )
class ds1204_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
ds1204_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock );
DECLARE_WRITE_LINE_MEMBER( write_rst );
DECLARE_WRITE_LINE_MEMBER( write_clk );
DECLARE_WRITE_LINE_MEMBER( write_dq );
DECLARE_READ_LINE_MEMBER( read_dq );
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 ATTR_PRINTF( 3, 4 ) verboselog( int n_level, const char *s_fmt, ... );
void new_state(int state);
void writebit(UINT8 *buffer);
void readbit(UINT8 *buffer);
enum state_t
{
STATE_STOP,
STATE_PROTOCOL,
STATE_READ_IDENTIFICATION,
STATE_WRITE_IDENTIFICATION,
STATE_WRITE_COMPARE_REGISTER,
STATE_WRITE_SECURITY_MATCH,
STATE_READ_SECURE_MEMORY,
STATE_WRITE_SECURE_MEMORY,
STATE_OUTPUT_GARBLED_DATA
};
enum command_t
{
COMMAND_READ = 0x62,
COMMAND_WRITE = 0x9d
};
enum cycle_t
{
CYCLE_NORMAL = 1,
CYCLE_PROGRAM = 2,
CYCLE_MASK = 3
};
static const int DQ_HIGH_IMPEDANCE = -1;
int m_rst;
int m_clk;
int m_dqw;
int m_dqr;
int m_state;
int m_bit;
UINT8 m_command[3];
UINT8 m_compare_register[8];
UINT8 m_unique_pattern[2];
UINT8 m_identification[8];
UINT8 m_security_match[8];
UINT8 m_secure_memory[16];
};
// device type definition
extern const device_type DS1204;
#endif
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