blob: 693d614cfe29919efbce058aad421bb6ca5b5a59 (
plain) (
tree)
|
|
// license:BSD-3-Clause
// copyright-holders:hap
/**********************************************************************
Fujitsu MB8421/22/31/32-90/-90L/-90LL/-12/-12L/-12LL
CMOS 16K-bit (2KB) dual-port SRAM
**********************************************************************/
#pragma once
#ifndef _MB8421_H
#define _MB8421_H
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
// note: INT pins are only available on MB84x1
// INTL is for the CPU on the left side, INTR for the one on the right
#define MCFG_MB8421_INTL_HANDLER(_devcb) \
devcb = &mb8421_device::set_intl_handler(*device, DEVCB_##_devcb);
#define MCFG_MB8421_INTR_HANDLER(_devcb) \
devcb = &mb8421_device::set_intr_handler(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> mb8421_device
class mb8421_device : public device_t
{
public:
mb8421_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// static configuration helpers
template<class _Object> static devcb_base &set_intl_handler(device_t &device, _Object object) { return downcast<mb8421_device &>(device).m_intl_handler.set_callback(object); }
template<class _Object> static devcb_base &set_intr_handler(device_t &device, _Object object) { return downcast<mb8421_device &>(device).m_intr_handler.set_callback(object); }
DECLARE_READ_LINE_MEMBER( busy_r ) { return 0; } // _BUSY pin - not emulated
uint8_t peek(offs_t offset) { return m_ram[offset & 0x7ff]; }
DECLARE_WRITE8_MEMBER( left_w );
DECLARE_READ8_MEMBER( left_r );
DECLARE_WRITE8_MEMBER( right_w );
DECLARE_READ8_MEMBER( right_r );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
private:
uint8_t m_ram[0x800];
devcb_write_line m_intl_handler;
devcb_write_line m_intr_handler;
};
// device type definition
extern const device_type MB8421;
#endif /* _MB8421_H */
|