blob: 07aa6b36db075d699302c17243ef5ddc99ba0e35 (
plain) (
blame)
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
|
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
National Semiconductor NMC9306 256-Bit Serial EEPROM emulation
**********************************************************************
_____ _____
CS 1 |* \_/ | 8 Vcc
SK 2 | | 7 NC
DI 3 | | 6 NC
DO 4 |_____________| 5 GND
**********************************************************************/
#ifndef MAME_MACHINE_NMC9306_H
#define MAME_MACHINE_NMC9306_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> nmc9306_device
class nmc9306_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
nmc9306_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
DECLARE_WRITE_LINE_MEMBER( cs_w );
DECLARE_WRITE_LINE_MEMBER( sk_w );
DECLARE_WRITE_LINE_MEMBER( di_w );
DECLARE_READ_LINE_MEMBER( do_r );
protected:
// device-level overrides
virtual void device_start() override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual void nvram_read(emu_file &file) override;
virtual void nvram_write(emu_file &file) override;
private:
inline uint16_t read(offs_t offset);
inline void write(offs_t offset, uint16_t data);
inline void erase(offs_t offset);
uint16_t m_register[16];
int m_bits;
int m_state;
uint8_t m_command;
uint8_t m_address;
uint16_t m_data;
bool m_ewen;
int m_cs;
int m_sk;
int m_do;
int m_di;
};
// device type definition
DECLARE_DEVICE_TYPE(NMC9306, nmc9306_device)
#endif // MAME_MACHINE_NMC9306_H
|