4 pci/104 express bus interface – ADLINK EXP-ETH8 User Manual
Page 18
TME-EXP-ETH8-1V3
Rev 1.3
Page 14 of 17
3.4
PCI/104 Express Bus Interface
The EXP-ETH8 uses x16 link of the PCI/104-Express bus. Which link is used depends if the board is stacked-up
or stacked -down.
On the module there is a PCI Express switch that detects the type of connection and forwards the other links
according to the specification.
The EXP-ETH8 can be used with the Hurricane-QM57.
At the Hurricane-QM57 you can stack-up one EXP-ETH8. Theoretical could be connected two EXP-ETH8, but
then they are limited to 4 Ethernet Ports at each add-on. The reason for this is the limitation of the I/O space
(and also therefore the devices) in the PCI-to-PCI bridge specification.
Top PCI/104-Express Connector
Connector Type: Samtec ASP-142781-05
Bottom PCI/104-Express Connector
Connector Type: Samtec ASP-129646-03
Pin
Signal
Pin
Signal
1
GPIO0
+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