Yamaha D24, Service Manual

Page: 21 / 30

D24
21
PIN
NO.
I/O FUNCTION NAME
PIN
NO.
I/O FUNCTION NAME
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
/WRHH
PE14
/WRHL
/CASHH
DACK1
VSS
A0
A1
A2
A3
A4
VCC
A5
VSS
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
VCC
A17
VSS
/CASHL
PA19
/RAS
/CASL
PA18
/CASH
VSS
RDWR
A18
A19
A20
VCC
A21
VSS
/RD
/WDTOVF
D31
D30
/WRH
/WRL
/CS1
/CS0
/IRQ3
/IRQ2
/CS3
/CS2
VSS
D29
D28
D27
D26
D25
VSS
D24
VCC
D23
D22
D21
D20
D19
D18
D17
VSS
D16
O
I/O
O
O
O
I
O
O
O
O
O
I
O
I
O
O
O
O
O
O
O
O
O
O
O
I
O
I
O
I/O
O
O
I/O
O
I
O
O
O
O
I
O
I
O
O
I/O
I/O
O
O
O
O
I
I
O
O
I
I/O
I/O
I/O
I/O
I/O
I
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I
I/O
HH write
Port E
HL write
HH Column address strobe
DMA transfer strobe
Ground
Address bus
Power supply
Address bus
Ground
Address bus
Power supply
Address bus
Ground
HL Column address strobe
Port A
Row address strobe
Column address strobe (low)
Port A
Column address strobe (high)
Ground
DRAM read/write
Address bus
Power supply
Address bus
Ground
Read
Watch dog timer overflow
Data bus
Data bus
High write
Low write
Chip select
Chip select
Interrupt request
Interrupt request
Chip select
Chip select
Ground
Data bus
Ground
Data bus
Power supply
Data bus
Ground
Data bus
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
D15
D14
D13
D12
VCC
D11
VSS
D10
D9
D8
D7
D6
VCC
D5
VSS
D4
D3
D2
D1
D0
VSS
XTAL
MD3
EXTAL
MD2
NMI
VCC
PA16
PA17
MD1
MD0
PLLVCC
PLLCAP
PLLVSS
CK
/RES
PE0
PE1
/DREQ1
VCC
PE3
PE4
PE5
PE6
VSS
PF0
PF1
PF2
PF3
PF4
PF5
AVSS
PF6
PF7
AVREF
AVCC
VSS
RxDO
TxDO
SCK0
RxD1
TxDO
VCC
SCK1
PE7
PE8
PE9
PE10
VSS
PE11
PE12
PE13
I/O
I/O
I/O
I/O
I
I/O
I
I/O
I/O
I/O
I/O
I/O
I
I/O
I
I/O
I/O
I/O
I/O
I/O
I
I
I
I
I
-
I
I/O
I/O
I
I
I
I
I
I/O
I
I/O
I/O
I
I
I/O
I/O
I/O
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I
I/O
I/O
I
I
I
I
O
I/O
I
O
I
I/O
I/O
I/O
I/O
I/O
I
I/O
I/O
I/O
Data bus
Power supply
Data bus
Ground
Data bus
Power supply
Data bus
Ground
Data bus
Ground
Crystal oscillator
Mode select
Crystal oscillator
Mode select
Non-maskable interrupt
Power supply
Port A
Port A
Mode select
Mode select
PLL Power supply
PLL capacitor
PLL Ground
Clock
Reset
Port E
Port E
DMA transfer request
Power supply
Port E
Ground
Port F
Analog ground
Port F
Port F
Analogreference voltage
Analog power supply
Ground
Receive data
Transmit data
Serial clock
Receive data
Transmit data
Power supply
Serial clock
Port E
Ground
Port E
HD6477043AF28 (XV736A00) CPU
MAIN: IC301