Difference between revisions of "ORCA SOM/ORCA Evaluation Kit/Interfaces and Connectors/PCIe"

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==PCIe interface ==
 
==PCIe interface ==
  
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''TBD: sostituire le sezioni con le informazioni sull'uso della periferica e del suo connettore''
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=== Description  ===
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''Nell'esempio di seguito c'è la descrizione dell'interfaccia UART/console''
+
 
 +
The PCI Express interface can be available on the Evaluation Kit at the connector J36. This connector is not mounted by default.
  
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=== Description  ===
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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.
  
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The PCIe interface available on the Evaluation Kit at the connector ''TBD:Jxxx''.  
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The external adapter can be found as a ''PCIe riser'', commonly used in Ethereum mining.
  
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''Jxx'' is a ''TBD:connector-type'' header connector for the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console).
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'''WARNING:''' do not connect USB devices to this port.
  
  
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{| class="wikitable"  
 
{| class="wikitable"  
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! latexfontsize="scriptsize"| Pin#
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! latexfontsize="scriptsize" | Pin#
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! latexfontsize="scriptsize"| SOM Pin#
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! latexfontsize="scriptsize" | SOM Pin#
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! latexfontsize="scriptsize"| Pin name
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! latexfontsize="scriptsize" | Pin name
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! latexfontsize="scriptsize"| Pin function
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! latexfontsize="scriptsize" | Pin function
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! latexfontsize="scriptsize"| Pin Notes
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! latexfontsize="scriptsize" | Pin Notes
 
|-
 
|-
−
|1,2,4,6,,7,8,10
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|1
 
| -
 
| -
−
| N.A.
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|VBUS
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| N.C.
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| PCIE_WAKE#
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| Not connected
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| Routed to a test point
 
|-
 
|-
−
| 3
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| 2
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| J1.189
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|J15.157
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| RS232_RX
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|D-
−
| Receive line
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| PCIE2_REF_CN_CLKN
 
|  
 
|  
 
|-
 
|-
 
| 3
 
| 3
−
| J1.187
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|J15.155
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| RS232_TX
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|D+
−
| Transmit line
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| PCIE2_REF_CN_CLKP
 
|  
 
|  
 
|-
 
|-
−
| 9
+
|4
 +
| -
 +
|GND
 +
| PCIE_PERST#
 +
| Routed to a test point
 +
|-
 +
|5
 +
|J15.159
 +
|SSRX-
 +
|PCIE_TXN_P
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|Internally decoupled with 100nF series
 +
|-
 +
|6
 +
|J15.161
 +
|SSRX+
 +
|PCIE_TXN_N
 +
|Internally decoupled with 100nF series
 +
|-
 +
|7
 
| -
 
| -
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| DGND
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|GND_D
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| Ground
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|Ground
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|  
+
|
 +
|-
 +
|8
 +
|J15.163
 +
|SSTX-
 +
|PCIE_RXN_P
 +
|
 +
|-
 +
|9
 +
|J15.165
 +
|SSTX+
 +
|PCIE_RXN_N
 +
|
 
|}
 
|}
  
 
=== Device mapping ===
 
=== Device mapping ===
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UART3 is mapped to <code>/dev/ttymxc2</code> device in Linux. The peripheral is used as the default serial console, both for the bootloader and the kernel.
+
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.
−
 
 
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=== Device usage ===
 
−
 
 
−
To connect to the debug serial port:
 
−
 
 
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# connect the DB9 adapter bracket to the J22 connector on the SBCX board
 
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# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)
 
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# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1
 
  
 
----
 
----
  
 
[[Category:ORCA SOM]]
 
[[Category:ORCA SOM]]

Revision as of 09:28, 16 September 2021

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History
Version Issue Date Notes
1.0.0 Sep 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.

WARNING: do not connect USB devices to this port.


[[File:{Template:Nome-som-EVB-PCIe-connector.png|thumb|center|500px|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.

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