NVIDIA Jetson TX2/TX2i OEM Product Design Guide
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
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Table 24. PCIE Signal Connections
Module Pin Name
Type
Termination
Description
PCIe Interface #0 (x1 default configuration
–
x4 optional.
/
–
(Lane 0)
USB/
–
(Lane 1)
/
–
(Lane 2)
PEX/
–
(Lane 3)
DIFF OUT
Series 0.1uF Capacitor
Differential Transmit Data Pairs:
Connect to
TX_P/N
pins of PCIe
connector or
RX_P/N
pin of PCIe device through AC cap according to
supported configuration. Default configuration (x1) uses only Lane 0.
P/
–
(Lane 0)
USB/
–
(Lane 1)
/
–
(Lane 2)
PEX/
–
(Lane 3)
DIFF IN
Series 0.1uF capacitors if
device on main PCB.
Differential Receive Data Pairs:
Connect to
RX_P/N
pins of PCIe
connector or
TX_P/N
pin of PCIe device through AC cap according to
supported configuration. Default configuration (x1) uses only Lane 0.
PEX0/
–
DIFF OUT
Differential Reference Clock Output:
Connect to
REFCLK_P/N
pins of
PCIe device/connector
PEX0_CLKREQ#
I/O
56
KΩ p
ullup to
VDD_3V3_SYS
on each line
(exists on the module)
PEX Clock Request for PEX0_REFCLK:
Connect to
CLKREQ
pin on
device/connector.
PEX0_RST#
O
PEX Reset:
Connect to
PERST
pin on device/connector.
PCIe Interface #1 (x1)
–
(Shared with PCIe Interface #0 lane 2)
/
–
DIFF OUT
Series 0.1uF Capacitor
Differential Transmit Data Pairs:
Connect to
TX+/
–
pins of PCIe
connector or
RX_+/
–
pin of PCIe device through AC cap according to
supported configuration.
/
–
DIFF IN
Series 0.1uF capacitors if
device on main PCB.
Differential Receive Data Pairs:
Connect to
RX_+/
–
pins of PCIe
connector or
TX_+/
–
pin of PCIe device through AC cap according to
supported configuration.
PEX2/
–
DIFF OUT
Differential Reference Clock Output
:
Connect to
REFCLK_
+/
–
pins of
PCIe device/connector.
PEX2_CLKREQ#
I/O
56
KΩ pullup to
VDD_3V3_SYS
on each line
(exists on the module)
PEX Clock Request for PEX2_REFCLK:
Connect to
CLKREQ
pin on
device/connector(s)
PEX2_RST#
O
PEX Reset:
Connect to
PERST
pin on device/connector.
PCIe Interface #2 (x1)
–
Muxed with USB 3.0 Port #0 on USB_SS0
/
–
DIFF OUT
Series 0.1uF Capacitor
Differential Transmit Data Pairs:
Connect to
TX+/
–
pins of PCIe
connector or RX_
+/
–
pin of PCIe device through AC cap according to
supported configuration.
/
–
DIFF IN
Series 0.1uF capacitors if
device on main PCB.
Differential Receive Data Pairs:
Connect to
RX_+/
–
pins of PCIe
connector or TX_
+/
–
pin of PCIe device through AC cap according to
supported configuration.
PEX1/
–
DIFF OUT
Differential Reference Clock Output:
Connect to
REFCLK_
+/
–
pins of
PCIe device/connector
PEX1_CLKREQ#
I/O
56
KΩ pullup to
VDD_3V3_SYS
on each line
(exists on the module)
PEX Clock Request for PEX1_REFCLK:
Connect to
CLKREQ
pin on
device/connector(s)
PEX1_RST#
O
PEX Reset:
Connect to
PERST
pin on device/connector(s)
PEX_WAKE#
I
56
KΩ pullup to
VDD_3V3_SYS
(exists on the
module)
PEX Wake:
Connect to
WAKE
pins on devices or connectors
Note:
Check “Supported USB 3.0, PEX & SATA Interface
Mappings” tables earlier in this section for P
CIE IF mapping options.
Table 25. Recommended PCIe observation (test) points for initial boards
Test Points Recommended
Location
One for each of the PCIe
TX_+/
–
output lines used.
Near PCIe device. Connector pins may serve as test points if accessible.
One for each of the PCIe
RX_+/
–
input lines used.
Near the module connector.