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7.1.1
USB 2.0 Design Guidelines
The following table details the requirements that apply to the USB 2.0 controller PHY
interfaces:
USB[2:0]_D_N/P.
Table 7-4.
USB 2.0 Interface Signal Routing Requirements
Parameter
Max frequency (high speed): Bit Rate/UI
period/Frequency
Max loading: High Speed / Full Speed / Low
Speed
Reference plane
Trace impedance: Diff pair / SE)
Via proximity (signal to reference)
Max trace length/delay
Max intra-pair skew between USBx_D_P
and USBx_D_N
Notes:
1. Up to four signal vias can share a single GND return via.
2. Adjustments to the USB drive strength, slew rate, termination value settings should not be necessary, but if any are made, they
MUST be done as an offset to default values instead of overwriting those values.
7.1.2
USB 3.2 Design Guidelines
The following table details the requirements that apply to the USB 3.2 PHY interfaces.
Table 7-5.
USB 3.2 Interface Signal Routing Requirements
Parameter
Specification
Data Rate / UI period
Gen1
Gen2
Max Number of Loads
Termination
Electrical Specification
Insertion Loss (IL)
Gen1 Host (Type C)
Gen1 Host (Type A)
Gen1 Device (Type C)
Gen1 Device (Micro AB)
Gen2 (Dual role mode)
Resonance Dip Frequency
Time-domain Reflectometer (TDR) Dip
Gen1
Gen2
PRELIMINARY INFORMATION
NVIDIA Jetson Orin NX
Requirement
Units
480/2.083/240
Mbps/ns/MHz
10 / 150 / 600
pF
GND
90 / 50
Ω
< 3.8 (24)
mm (ps)
6 (960)
In (ps)
7.5
ps
Requirement
Units
5.0 / 200
Gbps / ps
10.0 / 100
1
90 differential
≥ -3.8
dB @ 2.5GHz
≥ -7.3
dB @ 2.5GHz
≥ -3.8
dB @ 2,5GHz
≥ -2.5 [*]
dB @ 2.5GHz
≥ -4.5
dB @ 5GHz
> 8
75
75
Notes
Max loading should include any passive
and active components on the trace such
as CMC, Switch, ESD etc.
±15%
See Note 1
Notes
Device mode supports Gen1 speed only.
load
Ω
On-die termination at TX and RX
Only the PCB (and connector) without
added-on components such as CMC,
ESD, and Mux, is considered. The
connector is included. For Gen2 the
loss budget is the same for all
connector types. For dual role mode,
host and device have the same loss
GHz
budget
[*] the consideration of Gen1 fixture
loss
@ Tr = 200ps (10%-90%)
Ω
@ Tr = 61ps (10%-90%)
DG-10931-001_v0.1 | 24
USB and PCIe
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