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Diffstat (limited to 'trunk/src/emu/machine/ins8154.h')
-rw-r--r-- | trunk/src/emu/machine/ins8154.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/ins8154.h b/trunk/src/emu/machine/ins8154.h new file mode 100644 index 00000000000..1857a428223 --- /dev/null +++ b/trunk/src/emu/machine/ins8154.h @@ -0,0 +1,126 @@ +/*************************************************************************** + + National Semiconductor INS8154 + + N-Channel 128-by-8 Bit RAM Input/Output (RAM I/O) + + _____ _____ + PB6 1 |* \_/ | 40 VCC + PB5 2 | | 39 PB7 + PB4 3 | | 38 NWDS + PB3 4 | | 37 NRDS + PB2 5 | | 36 NRST + PB1 6 | | 35 _CS0 + PB0 7 | | 34 CS1 + DB7 8 | | 33 M/_IO + DB6 9 | | 32 AD6 + DB5 10 | INS8154 | 31 AD5 + DB4 11 | | 30 AD4 + DB3 12 | | 29 AD3 + DB2 13 | | 28 AD2 + DB1 14 | | 27 AD1 + DB0 15 | | 26 AD0 + PA7 16 | | 25 INTR + PA6 17 | | 24 PA0 + PA5 18 | | 23 PA1 + PA4 19 | | 22 PA2 + GND 20 |_____________| 21 PA3 + +***************************************************************************/ + +#pragma once + +#ifndef __INS8154_H__ +#define __INS8154_H__ + +#include "emu.h" + + + +/*************************************************************************** + DEVICE CONFIGURATION MACROS +***************************************************************************/ + +#define MCFG_INS8154_ADD(_tag, _intrf) \ + MCFG_DEVICE_ADD(_tag, INS8154, 0) \ + MCFG_DEVICE_CONFIG(_intrf) + + +/*************************************************************************** + TYPE DEFINITIONS +***************************************************************************/ + + +// ======================> ins8154_interface + +struct ins8154_interface +{ + devcb_read8 m_in_a_cb; + devcb_write8 m_out_a_cb; + devcb_read8 m_in_b_cb; + devcb_write8 m_out_b_cb; + devcb_write_line m_out_irq_cb; +}; + + + +// ======================> ins8154_device + +class ins8154_device : public device_t, + public ins8154_interface +{ +public: + // construction/destruction + ins8154_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + UINT8 ins8154_r(UINT32 offset); + void ins8154_w(UINT32 offset, UINT8 data); + + void ins8154_porta_w(UINT32 offset, UINT8 data); + void ins8154_portb_w(UINT32 offset, UINT8 data); + +protected: + // device-level overrides + virtual void device_config_complete(); + virtual void device_start(); + virtual void device_reset(); + virtual void device_post_load() { } + virtual void device_clock_changed() { } + +private: + + /* i/o lines */ + devcb_resolved_read8 m_in_a_func; + devcb_resolved_write8 m_out_a_func; + devcb_resolved_read8 m_in_b_func; + devcb_resolved_write8 m_out_b_func; + devcb_resolved_write_line m_out_irq_func; + + /* registers */ + UINT8 m_in_a; /* Input Latch Port A */ + UINT8 m_in_b; /* Input Latch Port B */ + UINT8 m_out_a; /* Output Latch Port A */ + UINT8 m_out_b; /* Output Latch Port B */ + UINT8 m_mdr; /* Mode Definition Register */ + UINT8 m_odra; /* Output Definition Register Port A */ + UINT8 m_odrb; /* Output Definition Register Port B */ +}; + + +// device type definition +extern const device_type INS8154; + + + +/*************************************************************************** + PROTOTYPES +***************************************************************************/ + +READ8_DEVICE_HANDLER( ins8154_r ); +WRITE8_DEVICE_HANDLER( ins8154_w ); + +WRITE8_DEVICE_HANDLER( ins8154_porta_w ); +WRITE8_DEVICE_HANDLER( ins8154_portb_w ); + + +#endif /* __INS8154_H__ */ |