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/**********************************************************************
Intel 8214 Priority Interrupt Controller emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
_B0 1 |* \_/ | 24 Vcc
_B1 2 | | 23 _ECS
_B2 3 | | 22 _R7
_SGS 4 | | 21 _R6
_INT 5 | | 20 _R5
_CLK 6 | 8214 | 19 _R4
INTE 7 | | 18 _R3
_A0 8 | | 17 _R2
_A1 9 | | 16 _R1
_A2 10 | | 15 _R0
_ELR 11 | | 14 ENLG
GND 12 |_____________| 13 ETLG
**********************************************************************/
#pragma once
#ifndef __I8214__
#define __I8214__
#include "emu.h"
///*************************************************************************
// INTERFACE CONFIGURATION MACROS
///*************************************************************************
#define MCFG_I8214_ADD(_tag, _clock, _config) \
MCFG_DEVICE_ADD(_tag, I8214, _clock) \
MCFG_DEVICE_CONFIG(_config)
#define I8214_INTERFACE(name) \
const i8214_interface (name) =
///*************************************************************************
// TYPE DEFINITIONS
///*************************************************************************
// ======================> i8214_interface
struct i8214_interface
{
devcb_write_line m_out_int_cb;
devcb_write_line m_out_enlg_cb;
};
// ======================> i8214_device
class i8214_device : public device_t, public i8214_interface
{
public:
// construction/destruction
i8214_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_WRITE_LINE_MEMBER( sgs_w );
DECLARE_WRITE_LINE_MEMBER( etlg_w );
DECLARE_WRITE_LINE_MEMBER( inte_w );
UINT8 a_r();
void b_w(UINT8 data);
void r_w(UINT8 data);
protected:
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
private:
inline void trigger_interrupt(int level);
inline void check_interrupt();
devcb_resolved_write_line m_out_int_func;
devcb_resolved_write_line m_out_enlg_func;
int m_inte; // interrupt enable
int m_int_dis; // interrupt disable flip-flop
int m_a; // request level
int m_b; // current status register
UINT8 m_r; // interrupt request latch
int m_sgs; // status group select
int m_etlg; // enable this level group
};
// device type definition
extern const device_type I8214;
#endif
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