// 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 ***************************************************************************/ #pragma once #ifndef __F3853_H__ #define __F3853_H__ //************************************************************************** // INTERFACE CONFIGURATION MACROS //************************************************************************** #define MCFG_F3853_EXT_INPUT_CB(_class, _method) \ f3853_device::set_interrupt_req_callback(*device, f3853_interrupt_req_delegate(&_class::_method, #_class "::" #_method, downcast<_class *>(owner))); /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ typedef device_delegate f3853_interrupt_req_delegate; #define F3853_INTERRUPT_REQ_CB(_name) void _name(uint16_t addr, int level) // ======================> 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); static void set_interrupt_req_callback(device_t &device, f3853_interrupt_req_delegate callback) { downcast(device).m_interrupt_req_cb = callback; } DECLARE_READ8_MEMBER(read); DECLARE_WRITE8_MEMBER(write); void set_external_interrupt_in_line(int level); void set_priority_in_line(int level); TIMER_CALLBACK_MEMBER(timer_callback); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_post_load() override { } virtual void device_clock_changed() override { } private: void set_interrupt_request_line(); void timer_start(uint8_t value); f3853_interrupt_req_delegate m_interrupt_req_cb; uint8_t m_high; uint8_t m_low; // Bit 7 is set to 0 for timer interrupts, 1 for external interrupts int32_t m_external_enable; int32_t m_timer_enable; int32_t m_request_flipflop; int32_t m_priority_line; /* inverted level*/ int32_t m_external_interrupt_line; /* inverted level */ emu_timer *m_timer; uint8_t m_value_to_cycle[0x100]; }; // device type definition extern const device_type F3853; #endif /* __F3853_H__ */