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NVIDIA Jetson Xavier NX DG-09693-001_v1.7 | 42
Trace Length, Spacing and Skew
Trace loss characteristic (max)
Up to HBR2
HBR3
0.81
0.7
dB/in@ 2.7GHz
dB/in@ 4.0GHz
The max lengths are derived based on
this characteristic. See Note 2.
Max PCB via dist. from connector
RBR/HBR
HBR2/HBR3
No requirement
7.63 (0.3)
mm (in)
Max trace length/delay from Jetson Xavier NX
TX to connector (Up to HBR3)
Stripline
Microstrip
100 (700)
100 (600)
mm (ps)
175ps/inch assumption for stripline,
150ps/inch for microstrip.
Trace spacing (pair-pair)
Stripline
Microstrip (HBR/RBR)
Microstrip (HBR2/HBR3)
3x
4x
5x
dielectric
Trace spacing (Main link to AUX)
Stripline/Microstrip
3x / 5x
dielectric
Max intra-pair (within pair) skew 0.15 (1) mm (ps) See Note 3
Max inter-pair (pair-pair) skew 150 ps See Note 4
Max
transition via distance < 1x diff pair pitch For signals switching reference layers,
add symmetrical
stitching via near
signal vias.
Impedance dip (min)
Recommended via dimension Drill/Pad
for impedance control
Antipad (min)
Via pitch (min)
97
92
200/400
840
880
Ω @ 200ps
Ω @ 35ps
um
um
um
The via dimension is required for HDMI-
DP co-layout.
Topology Y-pattern is recommended
Keep symmetry
Y-pattern helps with Xtalk suppression.
It can also reduce the limit of pair-pair
distance. Need review (NEXT/FEXT
check) if via placement is not Y-pattern.
See eDP/DP guideline Figure 8-5
For in-line via, the distance from a via
of one lane to the adjacent via from
another lane >= 1.2mm center-
center.
See eDP/DP guideline Figure 8-6
via
Place
via as symmetrically as
possible to data pair vias. Up to four
signal vias (2 diff pairs) can share a
single
return via
via is used to maintain a return
path, while its Xtalk suppression is
limited.
Max # of vias
PTH vias
Micro vias
2 if all vias are PTH via
Not limited as long as total channel
loss meets IL spec
Max via stub length 0.4 mm
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