Kontron nanoETXexpress, User Manual

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6 5BConnector and feature description
Kontron User's Guide
nanoETXexpress Evaluation Board
29
6.13 PCIexpress (J25, J26, J27, U31 and Status LEDs)
PCIexpress lane0 from the COMexpress module is used to connect a 5-lane PCIexpress Gen1 switch
PEX8505AA. The Type 1 connection of the nanoETXexpress Evaluation Board offers a maximum of 5 PCIe
lanes from the module (PCIe0 ... PCIE4). The switch provides 4 additional PCIexpress lanes (PCIe5 …
PCIe8). See the detailed PCIexpress configuration in the list below.
J25 (PCIexpress x4 Slot) and J26 (PCIexpress x1 Slot0) are mechanical x16 slots to connect x16
PCIexpress cards. The electrical configuration does not match the mechanical:
PCIexpress configuration:
Baseboard PCIe Lane Source Target
#0 COMe Module lane#0 PCIe Switch lane#0 (Uplink)
#1 COMe Module lane#1
PCIe x4 slot (J25)
#2 COMe Module lane#2
#3 COMe Module lane#3
#4 COMe Module lane#4
#5 PCIe Switch lane#1 PCIe-PCI Bridge
#6 PCIe Switch lane#2 Xpress-Card Slot
#7 PCIe Switch lane#3 PCIe x1 Slot0 (J26)
#8 PCIe Switch lane#4 PCIe x1 Slot1 (J27)
6 LEDs from the PCIe switch shows the status of PCIexpress. The 'Lane Good LEDs' D32 to D36 provides
visual indication that the Physical Layer of the link for each lane is trained to at least x1 width.
LED Function LED Function
D37 Fatal Error in PEX8505 D34 Xpress-Card
D36 Upstream link to Module D33 PCIe x1 Slot0
D35 PCIe-PCI Bridge D32 PCIe x1 Slot1