Nvidia JETSON XAVIER NX Design Guide

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NVIDIA Jetson Xavier NX DG-09693-001_v1.7 | 48
Parameter
Requirement
Units
Notes
Trace impedance: Diff pair
100
Ω
±10%. Target is 100Ω. 95Ω for the
breakout and main route is an
implementation option.
Reference plane
GND
Trace spacing/Length/Skew
Trace loss characteristic:
< 0.8
< 0.4
dB/in. @ 3GHz
dB/in. @ 1.5GHz
The max length is derived based on this
characteristic. See Note 1.
Trace spacing (pair-pair)
Stripline
Microstrip: pre 1.4b
Microstrip: 1.4b/2.0
3x
4x
5x to 7x
dielectric
For Stripline, this is 3x of the thinner of
above and below.
Trace spacing (Main link to DDC)
Stripline
Microstrip
3x
5x
dielectric
For Stripline, this is 3x of the thinner of
above and below.
Max total length/delay (1.4b/2.0 - up to
5.94Gbps)
Stripline
Microstrip (5x spacing)
Microstrip (7x spacing)
100 (690)
90 (531)
100 (590)
mm (ps)
Propagation delay: 175ps/in. for stripline,
150ps/in. for microstrip). Stripline is
preferred.
Max Total Length/Delay (Pre-1.4b - (up to
165Mhz)
Microstrip Stripline
254 (1500)
225 (1500)
mm (ps)
Propagation delay: 175ps/in. for stripline,
150ps/in. for microstrip).
Max intra-pair (within pair) skew
0.15 (1)
mm (ps)
See notes 1, 2, and 3
Max inter-pair (pair to pair) skew
150
ps
See notes 1, 2, and 3
Max GND transition via distance
1x
Diff pair via pitch
For signals switching reference layers,
add one or two ground stitching vias. It is
recommended they be symmetrical to
signal vias.
Via
Topology
- Y-pattern is recommended
- keep symmetry
Xtalk suppression is the best by Y-
pattern. Also it can reduce the limit of
pair-pair distance. Need review
(NEXT/FEXT check) if via placement is
not Y-pattern. See
Figure 8-11
Minimum impedance dip
97
92
Ω@200ps
Ω@35ps
Recommended via dimension
drill/pad
Antipad
via pitch
200/400
840
880
uM
GND via
Place GND via as symmetrically as
possible to data pair vias. Up to four
signal vias (2 diff pairs) can share a
single GND return via
GND via is used to maintain return path,
while its Xtalk suppression is limited
Max # of vias
PTH via
u-via
2 if all vias are PTH via
Not limited if total channel loss
meets IL spec.
Max via stub length
0.4
mm
long via stub requires review (IL and
resonance dip check)
Topology
The main route via dimensions should comply with the via structure rules (See via
section)
See topology in Figure 8-8
For the connector pin vias, follow the rules for the connector pin vias (See via section)
The traces after main route via should be routed as 100Ω differential or as uncoupled
50ohm SE traces on PCB top or bottom.
Max distance from R
PD
to main trace (seg B)
1
mm
Max distance from AC cap to RPD stubbing
point (seg A)
~0
mm
Max distance between ESD and signal via
3
mm
Add-on Components

Nvidia JETSON XAVIER NX Specifications

General

Storage	16 GB eMMC 5.1
AI Performance	21 TOPS (INT8)
Operating Temperature	-25°C to 80°C
Operating System	Linux (JetPack SDK)
GPU	NVIDIA Volta architecture with 384 CUDA cores and 48 Tensor cores
CPU	6-core NVIDIA Carmel ARMv8.2 64-bit CPU 6 MB L2 + 4 MB L3
Memory	8GB 128-bit LPDDR4x
Video Decode	2x 4K60 | 4x 4K30 | 8x 1080p60 | 16x 1080p30 (H.265/H.264)
Camera	Up to 6 cameras
Connectivity	Gigabit Ethernet, M.2 Key E for Wi-Fi/Bluetooth
Power	10 W / 15 W / 20 W
Dimensions	70mm x 45mm