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System Control Pin Function (mb-78 Board Ic805) - Sony DVP-S500D Service Manual

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5-2. SYSTEM CONTROL PIN FUNCTION (IC805 on MB-78 Board (9/9))
Pin No.
Pin Name
I/O
1
PB14/IRQ6
I
Input of interrupt fromIC506
2
PB15/IRQ7
I
Input of interrupt fromIC804
3
VSS
Digital ground
4-11
AD0-7
I/O
Data bus AD0-7
12
VSS
Digital ground
13, 14
AD8, 9
I/O
Data bus AD8,9
15
VCC
Digital power supply
16-21
AD10-15
I/O
Data bus AD10-15
22
VSS
Digital ground
23-30
A0-7
O
Address bus A0-7
31
VSS
Digital ground
32-39
A8-15
O
Address bus A8-15
40
VSS
Digital ground
41, 42
A16, 17
O
Address bus A16,17
43
VCC
Digital power supply
44-47
A18-21
O
Address bus A18-21
48
CS0
O
Chip select signal for external ROM(ICS803)
49
CS1
O
Chip select signal for external ROM(IC802)
50
CS2
Not used
51
CS3
Not used
52
VSS
Digital ground
53
PA0/CS4
O
Reset signal for IC101,209
54
PA1/CS5
O
Output of reset signal
55
PA2/CS6
O
Output of chip select signal to IC804
56
WAIT
I
Input of wait signal
57
WRL/WR
O
Output of write signal
58
WRH/LBS
Not used
59
RD
O
Output of read signal
60
PA7/BACK
O
Output of reset signal to IC508
61
VSS
Digital ground
62
PA8/BREQ
O
Output of reset signal to IC101
63
PA9
O
Output of reset signal to IC506
64
PA10
O
Output of A mute signal
65
PA11
O
Output of MA mute signal
Function
Pin No.
Pin Name
I/O
66
IRQ0
I
Input of interrupt fromIC203
67
IRQ1
I
Input of DMA request from IC203
68
IRQ2
I
Input of V SYNC(FID) interrupt signal
69
IRQ3
I
Input of interrupt from IC804
70
VCC
Digital power supply
71
CK
O
Output of internal clock
72
VSS
Digital ground
73
EXTAL
20MHz crystal connection pin
74
XTAL
20MHz crystal connection pin
75
VCC
Digital power supply
76
NMI
I/O
Hyper terminal pin
77
VCC (VPP)
Digital power supply
78
WDTOVF
Not used
79
RES
I
Input of reset signal
80
MD0
I
Input of mode select0 (fixed to 1)
81
MD1
I
Input of mode select1 (fixed to 0)
82
MD2
I
Input of mode select2 (fixed to 0)
83, 84
VCC
Digital power supply
85
AVCC
Analog power supply
86
AVREF
Reference power supply
87
PC0/AN0
I/O
Set of mode 1
88
PC1/AN1
I/O
Set of mode 2
89
PC2/AN2
I/O
Set of mode 3
90
PC3/AN3
I/O
Set of mode 4
91
AVSS
Analog ground
92
PC4/AN4
I/O
Set of mode 5
93
PC5/AN5
I/O
Set of mode 6
94
PC6/AN6
Not used
95
PC7/AN7
Not used
96
VSS
Digital ground
97
PB0
HFG
98
PB1
O
Output of reset signal for IC806
99
VCC
Digital power supply
100
PB2
O
Output of control signal for IC101
Function

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