ORCA SBC/Interfaces and Connectors/PCIe

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Version Issue Date Notes
1.0.0 Dec 2021 First release

PCIe interface[edit | edit source]

Description[edit | edit source]

The PCI Express interface can be available on the Evaluation Kit at the connector J36. This connector is not mounted by default.

J36 is a USB3.0 Type-A connector that delivers 1x PCIe slot. An external adapter is needed to route the signals to a standard PCIe connector.

The external adapter can be found as a PCIe riser, commonly used in Ethereum mining like this one.

WARNING: do not connect USB devices to this port.

PCIe connector

Signals[edit | edit source]

The following table describes the interface signals:

Pin# SOM Pin# Pin name Pin function Pin Notes
1 - VBUS PCIE_WAKE# Routed to a test point
2 J15.157 D- PCIE2_REF_CN_CLKN
3 J15.155 D+ PCIE2_REF_CN_CLKP
4 - GND PCIE_PERST# Routed to a test point
5 J15.159 SSRX- PCIE_TXN_P Internally decoupled with 100nF series
6 J15.161 SSRX+ PCIE_TXN_N Internally decoupled with 100nF series
7 - GND_D Ground
8 J15.163 SSTX- PCIE_RXN_P
9 J15.165 SSTX+ PCIE_RXN_N

Device mapping[edit | edit source]

The PCI express peripheral is mapped to the corresponding device in Linux depending on the associated kernel device driver and on the device tree configuration.