Adlink EXP-ISO-COM8 Manual de usuario Pagina 25

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TME-EXP-ISO-COM8-R1V0 Rev 1.0 20 (24)
2.3 PCI/104 Express Bus Interface
The EXP-ISO-COM8 uses x1 link of the PCI/104-Express bus. According to the EPIC Express specification it
depends on the stacking position above or below the CPU board which link is used. On the module there is a
PCI Express switch that detects the type of connection and forwards the other links according to the
specification.
Top PCI/104-Express Connector
Connector Type: Samtec ASP-142781-05
The blue highlighted signals are used by the OXPCIe958 chip, if the EXP-ISO-COM8 is stacked below the CPU
(stacked-down).
PIN Signal PIN Signal
1
USB OC
+5V
2
PE RST#
3
+3.3V
4
+3.3V
5
USB_1+
6
USB_0+
7
USB_1-
8
USB_0-
9
GND
10
GND
11
Pex1_1Tp
12
Pex1_0 Tp
13
Pex1_1Tn
14
Pex1_0 Tn
15
GND
16
GND
17
Pex1_2 Tp
18
Pex1_3 Tp
19
Pex1_2 Tn
20
Pex1_3 Tn
21
GND
22
GND
23
Pex1_1Rp
24
Pex1_0 Rp
25
Pex1_1Rn
26
Pex1_0 Rn
27
GND
28
GND
29
Pex1_2 Rp
30
Pex1_3 Rp
31
Pex1_2 Rn
32
Pex1_3 Rn
33
GND
34
GND
35
Pex1_1Clkp
36
Pex1_0Clkp
37
Pex1_1Clkn
38
Pex1_0Clkn
39
+5V_Always
40
+5V_Always
41
Pex1_2Clkp
42
Pex1_3Clkp
43
Pex1_2Clkn
44
Pex1_3Clkn
45
CPU_DIR
46
PWRGOOD
47
SMB_DAT
48
Pex16_Clkp
49
SMB_CLK
50
Pex16_Clkn
51
SMB_ALERT
52
PSON#
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