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2.8.3 USB3.0 Trace Length Guidelines
Figure 23 : Topology for USB3.0
Table 26 : USB3.0 Trace Length Guidelines
Parameter
Signal Group
Differential Impedance Target
Single End
Spacing between pairs-to-pairs
(inter-pair) (s)
Spacing between differential
pairs and high-speed periodic
signals
Spacing between differential
pairs and low-speed non
periodic signals
LA
LB
Max length of LA+LB
Length matching
Reference Plane
Spacing from edge of plane
Carrier Board Via Usage
Notes:
1.H is height above reference plane.
2.Spacing pairs to pairs are TX to TX or RX to RX(Noninterleaved )
Main Route Guidelines
USB3.0
85Ω ±10%
55Ω ±10%
9H
(MS) and
5H
(DS)
11H
(MS) and
7H
(DS)
11H
(MS) and
7H
(DS)
Please see the SOM-5992 Layout Checklist
Carrier Board Length
10"
Differential pairs (intra-pair): Max.
GND referencing preferred
Min. 40mils
Max. 3 vias per differential signal trace
８０
±2 mils
Notes
1, 2
1
1
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