// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** National Semiconductor NMC9306 256-Bit Serial EEPROM emulation ********************************************************************** _____ _____ 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, std::string 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() override; // device_nvram_interface overrides virtual void nvram_default() override; virtual void nvram_read(emu_file &file) override; virtual void nvram_write(emu_file &file) override; 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