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Chapter: Connectors
3.4.7 PCI-express Interfaces (x1)
The CB1056 board has two slots for PCIe-x1 expansion cards.
N
OTE
When the motherboard PCIe-x4 slot (page 43) is occupied with a x4 device, then x1 slot 2 is de-activated.
N
OTE
Please note that some signals in the following table are different from one PCIe slot to the other. This
applies to the clock signals (A13, A14), the receive signals (A16, A17), and the transmit signals (B14, B15).
Pinout PCI-express-x1 connector:
Description
hot plug detect 1
12 volt supply
12 volt supply
ground
reserved
reserved
reserved
reserved
3.3 volt supply
3.3 volt supply
PCIe reset
ground
reference clock +
reference clock -
ground
receive lane 0 +
receive lane 0 -
ground
page 42
Name
Pin
PRSNT1#
A1
12V
A2
12V
A3
GND
A4
N/C
A5
N/C
A6
N/C
A7
N/C
A8
3.3V
A9
3.3V
A10
PERST#
A11
GND
A12
REFCLK
A13
REFCLK#
A14
GND
A15
PER0
A16
PER0#
A17
GND
A18
Name
B1
12V
B2
12V
B3
N/C
B4
GND
B5
SMBCLK
B6
SMBDAT
B7
GND
B8
3.3V
B9
N/C
B10
S3.3V
B11
PEWAKE#
B12
N/C
B13
GND
B14
PET0
B15
PET0#
B16
GND
B17
PRSNT2#
B18
GND
Beckhoff New Automation Technology CB1056
Internal Connectors
Description
12 volt supply
12 volt supply
reserved
ground
SMBus clock PCIe
SMBus data PCIe
ground
3.3 volt supply
reserved
3.3V standby-supply
link reactivation
reserved
ground
transmit lane 0 +
transmit lane 0 -
ground
hot plug detect 2
ground
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