ORCA SOM/ORCA Evaluation Kit/Interfaces and Connectors/PCIe
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| 2021/12/13 | 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! |
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.
