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7.1.1
USB 2.0 Design Guidelines
These requirements apply to the USB 2.0 controller PHY interfaces: USB[3:0]
Table 7-7.
USB 2.0 Interface Signal Routing Requirements
Parameter
Max Frequency (High Speed): Bit Rate/UI
period/Freq.
Max Loading: High Speed / Full Speed / Low Speed
Reference plane
Trace Impedance: Diff pair / Single Ended
Max Trace Delay
With CMC or SW (Microstrip / Stripline)
Without CMC or SW (Microstrip / Stripline)
Max Intra-Pair Skew between USBx_P and USBx_N 7.5
Notes:
1.
If portion of route is over a flex cable this length should be included in the Max Trace Delay/Length calculation
and 85Ω Differential pair trace impedance is recommended.
2.
Up to 4 signal Vias can share a single GND return Via.
3.
CMC = Common-Mode-Choke. SW = Analog Switch
4.
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 3.1 Design Guidelines
The following requirements apply to the USB 3.1 PHY interfaces.
Table 7-8.
USB 3.1 Interface Signal Routing Requirements
Parameter
Specification
Data Rate / UI period
GEN1
GEN2
Max Number of Loads
Termination
Insertion Loss (IL)
Host
GEN1 (Type C)
GEN1 (Type A)
GEN2 (Single role host mode)
Device
GEN1 (Type C)
GEN1 (Micro AB)
GEN2 Host/GEN1 Device (dual role
mode)
Resonance Dip Frequency
Jetson AGX Xavier Series Product
Requirement
Units
480/2.083/240
Mbps/ns/MHz
10 / 150 / 600
pF
GND
90 / 50
Ω
900/1050 (6)
ps (in)
1350/1575 (9)
ps
Requirement
Units
5.0 / 200
Gbps / ps
10.0 / 100
1
load
90 differential
Ω
≥ -2
dB
≥ -7
dB
TBD
dB
≥ -2
dB
≥ -1
dB
≥ -5.4
dB
> 8
GHz
USB, PCIe, and UFS
Notes
±15%
Prop delay assumption: 6.9ps/mm. for
stripline, 5.9ps/mm. for microstrip). See
Note 3
Notes
Device mode supports GEN1 speed only.
On-die termination at TX and RX
@ 2.5GHz
@ 2.5GHz
@ 5GHz
@ 2.5GHz
@ 2.5GHz
@ 5GHz (Host) / 2.5GHz (Device)
The resonance dip could be caused by a via
stub for layer transition or trace stub for co-
layout.
DG-09840-001_v2.5 | 43
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