Nvidia Jetson TX2 Manual page 46

Figure 27: HDMI Clk/Data Topology
Jetson TX2/TX2i
Tegra
Note: R pad must be on the main trace. R
1.
PD
Chokes (600Ω@100MHz) or narrow traces (1uH@DC-100MHz) between pull-downs & FET are required for Standard
2.
Technology (through-hole) designs and recommended for HDI designs.
The trace after the main-route via should be routed on the Top or Bottom layer of the PCB, and either with 100ohm
3.
differential impedance, or as uncoupled 50ohm Single Ended traces.
R series resistor is required. See the R
4.
S
Table 43. HDMI Interface Signal Routing Requirements
Parameter
Specification
Max Frequency / UI
Topology
Termination At Receiver
On-board
Electrical Specification
IL
resonance dip frequency
TDR dip
FEXT (PSFEXT)
Impedance
Trace Impedance Diff pair 100
Reference plane
Trace spacing/Length/Skew
Trace loss characteristic:
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
AC
CAP
Main Route –
Seg A 0.1uF
Seg B
95-100Ω 100Ω
* Note 3
0.1uF
95-100Ω 100Ω
Seg C
PCB Vias
499Ω,
R
PD
1%
PCB Vias
3.3V
& AC must be on same layer.
PD CAP
section of the HDMI Interface Signal Routing Requirements table for details.
S
Requirement
5.94 / 168
Point to point
100
500
<= 1.7
<= 2
<= 3
< 6
> 12
>= 85
<= -50
<= -40
<= -40
IL/FEXT plot
GND
< 0.8
< 0.4
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
Common Mode
R
S
Chokes & ESD
(See note 4)
Seg D Seg E Seg F
100Ω 100Ω 100Ω
* Note 3 * Note 3 * Note 3
100Ω 100Ω 100Ω
See Note 1
499Ω,
1%
Choke or Trace
See Note 2
Units Notes
Gbps / ps Per lane – not total link bandwidth
Unidirectional, Differential
Ω Differential To 3.3V at receiver
To GND near connector
dB @ 1GHz
dB @ 1.5GHz
dB @ 3GHz
dB @ 6GHz
GHz
Ω @ Tr=200ps 10%-90%. If TDR dip is 75~85ohm that dip width
should < 250ps
dB at DC PSNEXT is derived from an algebraic summation of the
dB at 3GHz individual NEXT effects on each pair by the other pairs
dB at 6GHz
Ω ±10%. Target is 100Ω. 95Ω for the breakout & main
route is an implementation option.
dB/in. @ 3GHz The max length is derived based on this characteristic.
dB/in. @ 1.5GHz See note 1.
HDMI
Conn
TDR plot
46