text: // license:BSD-3-Clause
  // copyright-holders:Aaron Giles
  /*************************************************************************
  
      SMC91C9X ethernet controller implementation
  
      by Aaron Giles, Jean-François DEL NERO
  
  **************************************************************************/
  
  #ifndef MAME_MACHINE_SMC91C9X_H
  #define MAME_MACHINE_SMC91C9X_H
  
  /***************************************************************************
      TYPE DEFINITIONS
  ***************************************************************************/
  
  class smc91c9x_device : public device_t,public device_network_interface
  {
  public:
  	template <class Object> devcb_base &set_irq_callback(Object &&cb) { return m_irq_handler.set_callback(std::forward<Object>(cb)); }
  
  	DECLARE_READ16_MEMBER( read );
  	DECLARE_WRITE16_MEMBER( write );
  	TIMER_CALLBACK_MEMBER(send_frame);
  
  	virtual void recv_cb(uint8_t *data, int length) override;
  	void set_link_connected(bool connected) { m_link_unconnected = !connected; };
  
  protected:
  	smc91c9x_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
  
  	// device-level overrides
  	virtual void device_start() override;
  	virtual void device_reset() override;
  
  private:
  	static constexpr unsigned ETHER_BUFFER_SIZE   = 2048;
  	// TODO: 96 device is larger
  	static constexpr unsigned ETHER_BUFFERS = 16;
  	static constexpr unsigned ETHERNET_ADDR_SIZE = 6;
  
  	// external network is present
  	bool m_network_available;
  
  	// mmu
  	// The bits in these vectors indicate a packet has been allocated
  	u32 m_alloc_rx, m_alloc_tx;
  	std::vector<int> m_comp_tx, m_comp_rx;
  	// Requests a packet allocation and returns true
  	// and sets the packet number if successful
  	bool alloc_req(const int tx, int &packet_num);
  	// Releases an allocation
  	void alloc_release(const int packet_num);
  	// Resets the MMU
  	void mmu_reset();
  
  	// internal state
  	devcb_write_line m_irq_handler;
  
  	// link unconnected
  	bool m_link_unconnected;
  
  	/* raw register data and masks */
  	uint16_t          m_reg[64];
  	uint16_t          m_regmask[64];
  
  	/* IRQ information */
  	uint8_t           m_irq_state;
  
  	// Main memory
  	uint8_t           m_buffer[ETHER_BUFFER_SIZE * ETHER_BUFFERS];
  
  	/* counters */
  	uint32_t          m_sent;
  	uint32_t          m_recd;
  
  	emu_timer* m_tx_timer;
  
  	int ethernet_packet_is_for_me(const uint8_t *mac_address);
  	int is_broadcast(const uint8_t *mac_address);
  
  	void update_ethernet_irq();
  	void update_stats();
  
  	void process_command(uint16_t data);
  	void clear_tx_fifo();
  	void clear_rx_fifo();
  
  };
  
  
  class smc91c94_device : public smc91c9x_device
  {
  public:
  	smc91c94_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
  };
  
  class smc91c96_device : public smc91c9x_device
  {
  public:
  	smc91c96_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
  };
  
  
  DECLARE_DEVICE_TYPE(SMC91C94, smc91c94_device)
  DECLARE_DEVICE_TYPE(SMC91C96, smc91c96_device)
  
  
  /***************************************************************************
      DEVICE CONFIGURATION MACROS
  ***************************************************************************/
  
  #define MCFG_SMC91C94_ADD(tag) \
  	MCFG_DEVICE_ADD((tag), SMC91C94, 0)
  
  #define MCFG_SMC91C94_IRQ_CALLBACK(write) \
  	devcb = &downcast<smc91c94_device &>(*device).set_irq_callback(DEVCB_##write);
  
  #define MCFG_SMC91C96_ADD(tag) \
  	MCFG_DEVICE_ADD((tag), SMC91C96, 0)
  
  #define MCFG_SMC91C96_IRQ_CALLBACK(write) \
  	devcb = &downcast<smc91c96_device &>(*device).set_irq_callback(DEVCB_##write);
  
  #endif // MAME_MACHINE_SMC91C9X_H
  