// license:BSD-3-Clause // copyright-holders:Wilbert Pol /*************************************************************************** Fairchild F3853 SRAM interface with integrated interrupt controller and timer This chip is a timer shift register, basically the same as in the F3851. **************************************************************************** _____ _____ Vgg 1 |* \_/ | 40 Vdd PHI 2 | | 39 ROMC4 WRITE 3 | | 38 ROMC3 _INT REQ 4 | | 37 ROMC2 _PRI IN 5 | | 36 ROMC1 _RAM WRITE 6 | | 35 ROMC0 _EXT INT 7 | | 34 CPU READ ADDR7 8 | | 33 REG DR ADDR6 9 | | 32 ADDR15 ADDR5 10 | F3853 | 31 ADDR14 ADDR4 11 | | 30 ADDR13 ADDR3 12 | | 29 ADDR12 ADDR2 13 | | 28 ADDR11 ADDR1 14 | | 27 ADDR10 ADDR0 15 | | 26 ADDR9 DB0 16 | | 25 ADDR8 DB1 17 | | 24 DB7 DB2 18 | | 23 DB6 DB3 19 | | 22 DB5 Vss 20 |_____________| 21 DB4 ***************************************************************************/ #ifndef MAME_MACHINE_F3853_H #define MAME_MACHINE_F3853_H #pragma once /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ // ======================> f3853_device class f3853_device : public device_t { public: // construction/destruction f3853_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); auto int_req_callback() { return m_int_req_callback.bind(); } auto pri_out_callback() { return m_pri_out_callback.bind(); } template void set_int_daisy_chain_callback(Object &&cb) { m_int_daisy_chain_callback = std::forward(cb); } DECLARE_READ8_MEMBER(read); DECLARE_WRITE8_MEMBER(write); DECLARE_WRITE_LINE_MEMBER(ext_int_w); DECLARE_WRITE_LINE_MEMBER(pri_in_w); TIMER_CALLBACK_MEMBER(timer_callback); IRQ_CALLBACK_MEMBER(int_acknowledge); protected: // device-level overrides virtual void device_resolve_objects() override; virtual void device_start() override; virtual void device_reset() override; private: uint16_t timer_interrupt_vector() const { return m_int_vector & ~uint16_t(0x0080); } uint16_t external_interrupt_vector() const { return m_int_vector | uint16_t(0x0080); } void set_interrupt_request_line(); void timer_start(uint8_t value); devcb_write_line m_int_req_callback; devcb_write_line m_pri_out_callback; device_irq_acknowledge_delegate m_int_daisy_chain_callback; uint16_t m_int_vector; // Bit 7 is set to 0 for timer interrupts, 1 for external interrupts bool m_external_enable; bool m_timer_enable; bool m_request_flipflop; bool m_priority_line; /* inverted level*/ bool m_external_interrupt_line; /* inverted level */ emu_timer *m_timer; uint8_t m_value_to_cycle[0x100]; }; // device type definition DECLARE_DEVICE_TYPE(F3853, f3853_device) #endif // MAME_MACHINE_F3853_H