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Diffstat (limited to 'trunk/src/emu/machine/nmc9306.h')
-rw-r--r-- | trunk/src/emu/machine/nmc9306.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/nmc9306.h b/trunk/src/emu/machine/nmc9306.h new file mode 100644 index 00000000000..6658775d56e --- /dev/null +++ b/trunk/src/emu/machine/nmc9306.h @@ -0,0 +1,94 @@ +/********************************************************************** + + 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 |