// 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 **********************************************************************/ #ifndef MAME_MACHINE_NMC9306_H #define MAME_MACHINE_NMC9306_H #pragma once //************************************************************************** // 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_t 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_t read(offs_t offset); inline void write(offs_t offset, uint16_t data); inline void erase(offs_t offset); uint16_t m_register[16]; int m_bits; int m_state; uint8_t m_command; uint8_t m_address; uint16_t m_data; bool m_ewen; int m_cs; int m_sk; int m_do; int m_di; }; // device type definition DECLARE_DEVICE_TYPE(NMC9306, nmc9306_device) #endif // MAME_MACHINE_NMC9306_H