Nvidia JETSON TX2 User Manual

NVIDIA Jetson TX2/TX2i OEM Product Design Guide
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618 37
Table 30. Ethernet MDI Interface Signal Routing Requirements
Parameter
Requirement
Units
Notes
Reference plane
GND
Trace Impedance Diff pair / Single Ended
100 / 50

±15%. Differential impedance target is 100. 90can be used if 100
is not achievable
Min Trace Spacing (Pair-Pair)
0.763
mm
Max Trace Length
109 (690)
mm (ps)
Max Within Pair (Intra-Pair) Skew
0.15 (1)
mm (ps)
Number of Vias
minimum
Ideally there should be no vias, but if required for breakout to Ethernet
controller or magnetics, keep very close to either device.
Table 31. Ethernet Signal Connections
Module Pin Name
Type
Termination
Description
GBE_MDI[3:0]+/–
DIFF
I/O
ESD device to GND per signal
Gigabit Ethernet MDI IF Pairs: Connect to Magnetics +/ pins
GBE_LINK_ACT
O
  GND
Gigabit Ethernet ACT : Connect to LED1C on Ethernet connector.
GBE_LINK100
O
  GND.
 Pull-down to GND (exists on the module)
Gigabit Ethernet Link 100 : Connect to LED2C on Ethernet connector.
Pulldown part of strapping to use 3.3V PHY mode.
GBE_LINK1000
O
  GND
Gigabit Ethernet Link 1000 : Connect to Link 1000 LED on conn.
GBE_CTREF
na
Not used
Table 32. Recommended Gigabit Ethernet observation (test) points for initial boards
Test Points Recommended
Location
One for each of the MDI[3:0]+/– lines.
Near the module connector & Magnetics device.

Nvidia JETSON TX2 Specifications

General

Brand	Nvidia
Model	JETSON TX2
Category	Microcontrollers
Language	English