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Bus Board Pin Assignment
5V System Environment
Pin No.
Side B
1
–12V
2
TCK
3
Ground
4
TDO
5
+5V
6
+5V
7
INTB#
8
INTD#
9
PRSNT1#
10
Reserved
11
PRSNT2#
12
Ground
13
Ground
14
Reserved
15
Ground
16
CLK
17
Ground
18
REQ#
19
+5V
20
AD[31]
21
AD[29]
22
Ground
23
AD[27]
24
AD[25]
25
+3.3V
26
C/BE[3]#
27
AD[23]
28
Ground
29
AD[21]
30
AD[19]
31
+3.3V
32
AD[17]
33
C/BE[2]#
34
Ground
35
IRDY#
36
+3.3V
37
DEVSEL#
38
Ground
39
LOCK#
40
PERR#
41
+3.3V
42
SERR#
43
+3.3V
44
C/BE[1]#
45
AD[14]
46
Ground
47
AD[12]
48
AD[10]
# low active
SIMATIC Box PC 840 Manual
A5E00085984-04
Side A
Pin No.
TRST#
49
50
+12V
TMS
51
TDI
52
+5V
53
INTA#
54
INTC#
55
+5V
56
Reserved
57
+5V
58
Reserved
59
Ground
60
Ground
61
AUX3V
62
RST#
+5V
GNT#
63
Ground
64
ME#
65
AD[30]
66
+3.3V
67
AD[28]
68
AD[26]
69
Ground
70
AD[24]
71
IDSEL
72
+3.3V
73
AD[22]
74
AD[20]
75
Ground
76
AD[18]
77
AD[16]
78
+3.3V
79
FRAME#
80
Ground
81
TRDY#
82
Ground
83
STOP#
84
+3.3V
85
SDONE
86
SBO#
87
Ground
88
PAR
89
AD[15]
90
+3.3V
91
AD[13]
92
AD[11]
93
Ground
94
Hardware Information
5V System Environment
Side B
Side A
Ground
AD[09]
CONNECTOR KEY
CONNECTOR KEY
AD[08]
C/BE[0]#
AD[07]
+3.3V
+3.3V
AD[06]
AD[05]
AD[04]
AD[03]
Ground
Ground
AD[02]
AD[01]
AD[00]
+5V
+5V
Reserved
Reserved
+5V
+5V
+5V
+5V
CONNECTOR KEY
CONNECTOR KEY
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Ground
Ground
Reserved
Reserved
Reserved
Reserved
Reserved
+3.3 V
Ground
PCI_GND_N1
PCI1_PCLK
Ground
Ground
PCI_GND_N2
PCI_REQ_N1
Ground
Ground
PCI6_PCLK
PCI2_PCLK
RISER_ID1
Ground
Reserved
PCI_REQ_N2
RISER_ID2
Ground
NO_GO
PCI_REQA_N
+12V
PCI_GNTA_N
SERIRQ_N
–3.3V
+3.3V
PCI3_PCLK
Ground
Ground
PCI_GNT.N3
PCI_REQ_N3
Ground
Ground
PCI4_PCLK
PCI_REQ_N4
Ground
Ground
PCI_GNT_N4
PCI5_PCLK
+3.3V
+3.3V
PCI_GNT_N5
PCI_REQ_N5
+3.3V
Ground
ISA_OSL
+12V
+12V
+12V
+12V
–12V
–5V
7-23

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