PCI/104-Express Bus
Chapter:
Connectors
ADL Embedded Solutions
ADLE3800PC
page 19
3.5 PCI/104-Express Bus
Expansion modules for the PCI-Express bus can be connected to the board using the PCI/104-
Express™
connector. This is a "type 2" connector with only those signals connected that are supported by the
chipset. "Stacking Error" functionality is available. For specifics, please refer to the PCI/104-
Express™
documentation (rev. 2.01).
Pinout PCI104-Express connector (type 2):
Description
Name
Pin
Name
Description
USB Overcurrent
USBOC#
1
2
PERST#
PCIe reset
3.3V supply
3.3V
3
4
3.3V
3.3V supply
USB7 +
USB7
5
6
USB8
USB8 +
USB7 -
USB7#
7
8
USB8#
USB8 -
ground
GND
9
10
GND
ground
transmit lane 2 +
PEx1_1T
11
12
PEx1_0T
transmit lane 1 +
transmit lane 2 -
PEx1_1T#
13
14
PEx1_0T#
transmit lane 1 -
ground
GND
15
16
GND
ground
reserved
N/C
17
18
N/C
reserved
reserved
N/C
19
20
N/C
reserved
ground
GND
21
22
GND
ground
receive lane 2 +
PEx1_1R
23
24
PEx1_0R
receive lane 1 +
receive lane 2 -
PEx1_1R#
25
26
PEx1_0R#
receive lane 1 -
ground
GND
27
28
GND
ground
reserved
N/C
29
30
N/C
reserved
reserved
N/C
31
32
N/C
reserved
ground
GND
33
34
GND
ground
clock slot 2 +
PEx1_1C
35
36
PEx1_0C
clock slot 1 +
clock slot 2 -
PEx1_1C#
37
38
PEx1_0C#
clock slot 1 -
5V standby supply
SVCC
39
40
SVCC
5V standby supply
reserved
N/C
41
42
N/C
reserved
reserved
N/C
43
44
N/C
reserved
CPU direction
CPU_DIR
45
46
PWRGOOD Powergood
SMBus data
SMBDAT
47
48
N/C
reserved
SMBus clock
SMBCLK
49
50
N/C
reserved
SMBus alert
SMBALERT 51
52
PSON#
PS ON
link reactivation
PEWAKE#
53
54
ST1-ERR#
stacking error 1
