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Diffstat (limited to 'trunk/src/emu/machine/z80ctc.h')
-rw-r--r-- | trunk/src/emu/machine/z80ctc.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/z80ctc.h b/trunk/src/emu/machine/z80ctc.h new file mode 100644 index 00000000000..4ffd3395ff4 --- /dev/null +++ b/trunk/src/emu/machine/z80ctc.h @@ -0,0 +1,168 @@ +/*************************************************************************** + + Z80 CTC (Z8430) implementation + + Copyright Nicola Salmoria and the MAME Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**************************************************************************** + _____ _____ + D4 1 |* \_/ | 28 D3 + D5 2 | | 27 D2 + D6 3 | | 26 D1 + D7 4 | | 25 D0 + GND 5 | | 24 +5V + _RD 6 | | 23 CLK/TRG0 + ZC/TOO 7 | Z80-CTC | 22 CLK/TRG1 + ZC/TO1 8 | | 21 CLK/TRG2 + ZC/TO2 9 | | 20 CLK/TRG3 + _IORQ 10 | | 19 CS1 + IEO 11 | | 18 CS0 + _INT 12 | | 17 _RESET + IEI 13 | | 16 _CE + _M1 14 |_____________| 15 CLK + +***************************************************************************/ + +#ifndef __Z80CTC_H__ +#define __Z80CTC_H__ + +#include "cpu/z80/z80daisy.h" + + +//************************************************************************** +// CONSTANTS +//************************************************************************** + +const int NOTIMER_0 = (1<<0); +const int NOTIMER_1 = (1<<1); +const int NOTIMER_2 = (1<<2); +const int NOTIMER_3 = (1<<3); + + + +//************************************************************************** +// DEVICE CONFIGURATION MACROS +//************************************************************************** + +#define Z80CTC_INTERFACE(name) \ + const z80ctc_interface (name)= + + +#define MCFG_Z80CTC_ADD(_tag, _clock, _intrf) \ + MCFG_DEVICE_ADD(_tag, Z80CTC, _clock) \ + MCFG_DEVICE_CONFIG(_intrf) + + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + + +// ======================> z80ctc_interface + +struct z80ctc_interface +{ + UINT8 m_notimer; // timer disabler mask + devcb_write_line m_intr_cb; // callback when change interrupt status + devcb_write_line m_zc0_cb; // ZC/TO0 callback + devcb_write_line m_zc1_cb; // ZC/TO1 callback + devcb_write_line m_zc2_cb; // ZC/TO2 callback +}; + + + +// ======================> z80ctc_device + +class z80ctc_device : public device_t, + public device_z80daisy_interface, + public z80ctc_interface +{ +public: + // construction/destruction + z80ctc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + // state getters + attotime period(int ch) const { return m_channel[ch].period(); } + + // I/O operations + UINT8 read(int ch) { return m_channel[ch].read(); } + void write(int ch, UINT8 data) { m_channel[ch].write(data); } + void trigger(int ch, UINT8 data) { m_channel[ch].trigger(data); } + +private: + // device-level overrides + virtual void device_config_complete(); + virtual void device_start(); + virtual void device_reset(); + + // z80daisy_interface overrides + virtual int z80daisy_irq_state(); + virtual int z80daisy_irq_ack(); + virtual void z80daisy_irq_reti(); + + // internal helpers + void interrupt_check(); + void timercallback(int chanindex); + + // a single channel within the CTC + class ctc_channel + { + public: + ctc_channel(); + + void start(z80ctc_device *device, int index, bool notimer, const devcb_write_line &write_line); + void reset(); + + UINT8 read(); + void write(UINT8 data); + + attotime period() const; + void trigger(UINT8 data); + void timer_callback(); + + z80ctc_device * m_device; // pointer back to our device + int m_index; // our channel index + devcb_resolved_write_line m_zc; // zero crossing callbacks + bool m_notimer; // timer disabled? + UINT16 m_mode; // current mode + UINT16 m_tconst; // time constant + UINT16 m_down; // down counter (clock mode only) + UINT8 m_extclk; // current signal from the external clock + emu_timer * m_timer; // array of active timers + UINT8 m_int_state; // interrupt status (for daisy chain) + + private: + static TIMER_CALLBACK( static_timer_callback ) { reinterpret_cast<z80ctc_device::ctc_channel *>(ptr)->timer_callback(); } + }; + + // internal state + devcb_resolved_write_line m_intr; // interrupt callback + + UINT8 m_vector; // interrupt vector + attotime m_period16; // 16/system clock + attotime m_period256; // 256/system clock + ctc_channel m_channel[4]; // data for each channel +}; + + +// device type definition +extern const device_type Z80CTC; + + + +//************************************************************************** +// READ/WRITE HANDLERS +//************************************************************************** + +WRITE8_DEVICE_HANDLER( z80ctc_w ); +READ8_DEVICE_HANDLER( z80ctc_r ); + +WRITE_LINE_DEVICE_HANDLER( z80ctc_trg0_w ); +WRITE_LINE_DEVICE_HANDLER( z80ctc_trg1_w ); +WRITE_LINE_DEVICE_HANDLER( z80ctc_trg2_w ); +WRITE_LINE_DEVICE_HANDLER( z80ctc_trg3_w ); + + +#endif |