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Diffstat (limited to 'src/devices/bus/megadrive/stm95.h')
-rw-r--r-- | src/devices/bus/megadrive/stm95.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/devices/bus/megadrive/stm95.h b/src/devices/bus/megadrive/stm95.h new file mode 100644 index 00000000000..39e40770019 --- /dev/null +++ b/src/devices/bus/megadrive/stm95.h @@ -0,0 +1,86 @@ +// license:BSD-3-Clause +// copyright-holders:Fabio Priuli, MetalliC +#ifndef __MD_STM95_H +#define __MD_STM95_H + +#include "md_slot.h" + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +/* ST M95320 32Kbit serial EEPROM implementation */ +// TO DO: STM95 should be made a separate EEPROM device and this should be merged with md_eeprom.c! + +#define M95320_SIZE 0x1000 + +enum STMSTATE +{ + IDLE = 0, + CMD_WRSR, + CMD_RDSR, + M95320_CMD_READ, + CMD_WRITE, + READING, + WRITING +}; + +class stm95_eeprom_device +{ +public: + stm95_eeprom_device(running_machine &machine, UINT8 *eeprom); + running_machine &machine() const { return m_machine; } + + UINT8 *eeprom_data; + void set_cs_line(int); + void set_halt_line(int state) {}; // not implemented + void set_si_line(int); + void set_sck_line(int state); + int get_so_line(void); + +protected: + int latch; + int reset_line; + int sck_line; + int WEL; + + STMSTATE stm_state; + int stream_pos; + int stream_data; + int eeprom_addr; + + running_machine& m_machine; +}; + + +// ======================> md_eeprom_stm95_device + +class md_eeprom_stm95_device : public device_t, + public device_md_cart_interface +{ +public: + // construction/destruction + md_eeprom_stm95_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source); + md_eeprom_stm95_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + // device-level overrides + virtual void device_start(); + virtual void device_reset(); + + // reading and writing + virtual DECLARE_READ16_MEMBER(read); + virtual DECLARE_READ16_MEMBER(read_a13); + virtual DECLARE_WRITE16_MEMBER(write_a13); + +private: + UINT8 m_bank[3]; + int m_rdcnt; + + auto_pointer<stm95_eeprom_device> m_stm95; +}; + + +// device type definition +extern const device_type MD_EEPROM_STM95; + +#endif |