/*************************************************************************** Zilog Z80 Parallel Input/Output Controller implementation Copyright Nicola Salmoria and the MAME Team. Visit http://mamedev.org for licensing and usage restrictions. *************************************************************************** _____ _____ D2 1 |* \_/ | 40 D3 D7 2 | | 39 D4 D6 3 | | 38 D5 _CE 4 | | 37 _M1 C/_D 5 | | 36 _IORQ B/_A 6 | | 35 RD PA7 7 | | 34 PB7 PA6 8 | | 33 PB6 PA5 9 | | 32 PB5 PA4 10 | Z8420 | 31 PB4 GND 11 | | 30 PB3 PA3 12 | | 29 PB2 PA2 13 | | 28 PB1 PA1 14 | | 27 PB0 PA0 15 | | 26 +5V _ASTB 16 | | 25 CLK _BSTB 17 | | 24 IEI ARDY 18 | | 23 _INT D0 19 | | 22 IEO D1 20 |_____________| 21 BRDY ***************************************************************************/ #ifndef __Z80PIO__ #define __Z80PIO__ #include "cpu/z80/z80daisy.h" //************************************************************************** // DEVICE CONFIGURATION MACROS //************************************************************************** #define MCFG_Z80PIO_ADD(_tag, _clock, _intrf) \ MCFG_DEVICE_ADD(_tag, Z80PIO, _clock) \ MCFG_DEVICE_CONFIG(_intrf) #define Z80PIO_INTERFACE(_name) \ const z80pio_interface (_name) = //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> z80pio_interface struct z80pio_interface { devcb_write_line m_out_int_cb; devcb_read8 m_in_pa_cb; devcb_write8 m_out_pa_cb; devcb_write_line m_out_ardy_cb; devcb_read8 m_in_pb_cb; devcb_write8 m_out_pb_cb; devcb_write_line m_out_brdy_cb; }; // ======================> z80pio_device class z80pio_device : public device_t, public device_z80daisy_interface, public z80pio_interface { public: enum { PORT_A = 0, PORT_B, PORT_COUNT }; // construction/destruction z80pio_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); // I/O line access int rdy(int which) { return m_port[which].rdy(); } void strobe(int which, bool state) { m_port[which].strobe(state); } DECLARE_READ_LINE_MEMBER( rdy_a ) { return rdy(PORT_A); } DECLARE_READ_LINE_MEMBER( rdy_b ) { return rdy(PORT_B); } DECLARE_WRITE_LINE_MEMBER( strobe_a ) { strobe(PORT_A, state); } DECLARE_WRITE_LINE_MEMBER( strobe_b ) { strobe(PORT_B, state); } // control register I/O UINT8 control_read(); void control_write(int offset, UINT8 data) { m_port[offset & 1].control_write(data); } void control_a_write(UINT8 data) { control_write(PORT_A, data); } void control_b_write(UINT8 data) { control_write(PORT_B, data); } // data register I/O UINT8 data_read(int offset) { return m_port[offset & 1].data_read(); } void data_write(int offset, UINT8 data) { m_port[offset & 1].data_write(data); } UINT8 data_a_read() { return data_read(PORT_A); } UINT8 data_b_read() { return data_read(PORT_B); } void data_a_write(UINT8 data) { data_write(PORT_A, data); } void data_b_write(UINT8 data) { data_write(PORT_B, data); } // port I/O UINT8 port_read(int offset) { return m_port[offset & 1].read(); } void port_write(int offset, UINT8 data) { m_port[offset & 1].write(data); } UINT8 port_a_read() { return port_read(PORT_A); } UINT8 port_b_read() { return port_read(PORT_B); } void port_a_write(UINT8 data) { port_write(PORT_A, data); } void port_b_write(UINT8 data) { port_write(PORT_B, data); } // standard read/write, with C/D in bit 1, B/A in bit 0 DECLARE_READ8_MEMBER( read ); DECLARE_WRITE8_MEMBER( write ); // alternate read/write, with C/D in bit 0, B/A in bit 1 DECLARE_READ8_MEMBER( read_alt ); DECLARE_WRITE8_MEMBER( write_alt ); private: // device-level overrides virtual void device_config_complete(); virtual void device_start(); virtual void device_reset(); // device_z80daisy_interface overrides virtual int z80daisy_irq_state(); virtual int z80daisy_irq_ack(); virtual void z80daisy_irq_reti(); // internal helpers void check_interrupts(); // a single PIO port class pio_port { friend class z80pio_device; public: pio_port(); void start(z80pio_device *device, int index, const devcb_read8 &infunc, const devcb_write8 &outfunc, const devcb_write_line &rdyfunc); void reset(); bool interrupt_signalled(); void trigger_interrupt(); int rdy() const { return m_rdy; } void set_rdy(bool state); void set_mode(int mode); void strobe(bool state); UINT8 read(); void write(UINT8 data); void control_write(UINT8 data); UINT8 data_read(); void data_write(UINT8 data); private: void check_interrupts() { m_device->check_interrupts(); } z80pio_device * m_device; int m_index; devcb_resolved_read8 m_in_p_func; devcb_resolved_write8 m_out_p_func; devcb_resolved_write_line m_out_rdy_func; int m_mode; // mode register int m_next_control_word; // next control word UINT8 m_input; // input latch UINT8 m_output; // output latch UINT8 m_ior; // input/output register bool m_rdy; // ready bool m_stb; // strobe // interrupts bool m_ie; // interrupt enabled bool m_ip; // interrupt pending bool m_ius; // interrupt under service UINT8 m_icw; // interrupt control word UINT8 m_vector; // interrupt vector UINT8 m_mask; // interrupt mask bool m_match; // logic equation match }; // internal state pio_port m_port[2]; devcb_resolved_write_line m_out_int_func; }; // device type definition extern const device_type Z80PIO; #endif