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/**********************************************************************
National Semiconductor NMC9306 256-Bit Serial EEPROM emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
CS 1 |* \_/ | 8 Vcc
SK 2 | | 7 NC
DI 3 | | 6 NC
DO 4 |_____________| 5 GND
**********************************************************************/
#pragma once
#ifndef __NMC9306__
#define __NMC9306__
#include "emu.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_NMC9306_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, NMC9306, 0)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> nmc9306_device
class nmc9306_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
nmc9306_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_WRITE_LINE_MEMBER( cs_w );
DECLARE_WRITE_LINE_MEMBER( sk_w );
DECLARE_WRITE_LINE_MEMBER( di_w );
DECLARE_READ_LINE_MEMBER( do_r );
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 UINT16 read(offs_t offset);
inline void write(offs_t offset, UINT16 data);
inline void erase(offs_t offset);
UINT16 m_register[16];
int m_bits;
int m_state;
UINT8 m_command;
UINT8 m_address;
UINT16 m_data;
bool m_ewen;
int m_cs;
int m_sk;
int m_do;
int m_di;
};
// device type definition
extern const device_type NMC9306;
#endif
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