1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
eeprompar.h
Parallel EEPROM devices.
***************************************************************************/
#ifndef MAME_MACHINE_EEPROMPAR_H
#define MAME_MACHINE_EEPROMPAR_H
#pragma once
#include "eeprom.h"
class eeprom_parallel_base_device : public eeprom_base_device
{
protected:
// construction/destruction
eeprom_parallel_base_device(const machine_config &mconfig, device_type devtype, const char *tag, device_t *owner);
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
};
class eeprom_parallel_28xx_device : public eeprom_parallel_base_device
{
public:
// configuration helpers
void lock_after_write(bool lock) { m_lock_after_write = lock; }
// read/write data lines
void write(offs_t offset, uint8_t data);
uint8_t read(address_space &space, offs_t offset);
// control lines
DECLARE_WRITE_LINE_MEMBER(oe_w);
void unlock_write8(uint8_t data);
void unlock_write16(uint16_t data);
void unlock_write32(uint32_t data);
protected:
// construction/destruction
eeprom_parallel_28xx_device(const machine_config &mconfig, device_type devtype, const char *tag, device_t *owner);
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
private:
// configuration state
bool m_lock_after_write; // lock EEPROM after writes
// runtime state
int m_oe; // state of OE line (-1 = synchronized with read)
};
//**************************************************************************
// DERIVED TYPES
//**************************************************************************
// macro for declaring a new device class
#define DECLARE_PARALLEL_EEPROM_DEVICE(_baseclass, _lowercase, _uppercase) \
class eeprom_parallel_##_lowercase##_device : public eeprom_parallel_##_baseclass##_device \
{ \
public: \
eeprom_parallel_##_lowercase##_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock = XTAL()); \
}; \
DECLARE_DEVICE_TYPE(EEPROM_##_uppercase, eeprom_parallel_##_lowercase##_device)
// standard 28XX class of 8-bit EEPROMs
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 2804, 2804)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 2816, 2816)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 2864, 2864)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 28256, 28256)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 28512, 28512)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 28010, 28010)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 28020, 28020)
DECLARE_PARALLEL_EEPROM_DEVICE(28xx, 28040, 28040)
#endif // MAME_MACHINE_EEPROMPAR_H
|