ADLINK EXP-ISO-COM8 - Manual (Page 25)

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#