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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Intel 8214/3214 Priority Interrupt Control Unit
**********************************************************************
_____ _____
_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 | 3214 | 18 _R3
_A0 8 | | 17 _R2
_A1 9 | | 16 _R1
_A2 10 | | 15 _R0
_ELR 11 | | 14 ENLG
GND 12 |_____________| 13 ETLG
**********************************************************************/
#ifndef MAME_MACHINE_I8214_H
#define MAME_MACHINE_I8214_H
#pragma once
///*************************************************************************
// INTERFACE CONFIGURATION MACROS
///*************************************************************************
#define MCFG_I8214_INT_CALLBACK(_write) \
devcb = &downcast<i8214_device &>(*device).set_int_wr_callback(DEVCB_##_write);
#define MCFG_I8214_ENLG_CALLBACK(_write) \
devcb = &downcast<i8214_device &>(*device).set_enlg_wr_callback(DEVCB_##_write);
///*************************************************************************
// TYPE DEFINITIONS
///*************************************************************************
// ======================> i8214_device
class i8214_device : public device_t
{
public:
// construction/destruction
i8214_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template <class Object> devcb_base &set_int_wr_callback(Object &&cb) { return m_write_int.set_callback(std::forward<Object>(cb)); }
template <class Object> devcb_base &set_enlg_wr_callback(Object &&cb) { return m_write_enlg.set_callback(std::forward<Object>(cb)); }
DECLARE_WRITE_LINE_MEMBER( sgs_w );
DECLARE_WRITE_LINE_MEMBER( etlg_w );
DECLARE_WRITE_LINE_MEMBER( inte_w );
uint8_t a_r();
DECLARE_READ8_MEMBER(vector_r);
void b_w(uint8_t data);
void r_w(int line, int state);
protected:
// device-level overrides
virtual void device_start() override;
private:
void trigger_interrupt(int level);
void check_interrupt();
void update_interrupt_line();
devcb_write_line m_write_int;
devcb_write_line m_write_enlg;
int m_inte; // interrupt enable
int m_int_dis; // interrupt (latch) disable flip-flop
int m_a; // request level
int m_current_status;
uint8_t m_r; // interrupt request latch
int m_sgs; // status group select
int m_etlg; // enable this level group
};
// device type definition
DECLARE_DEVICE_TYPE(I8214, i8214_device)
#endif // MAME_MACHINE_I8214_H
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