Kontron COMe Starterkit Eval T2 - Manual (Page 186)

Carrier Board PCB Layout Guidelines
6.5.6. DisplayPort Trace Routing Guidelines
Table 65: DisplayPort Trace Routing Guidelines
Parameter Trace Routing
Transfer Rate Max. 5.4 GBit/s
Maximum signal line length
(coupled traces) 7.2 inches
Signal length used on COM Express Module
(including the Carrier Board connector) 4.0 inches
Signal length allowance for the COM Express Carrier
Board 3.2 inches
Differential Impedance 85 Ω +/-10%
Single-ended Impedance 50 Ω +/-15%
Trace width (W) PCB stack-up dependent
Spacing between differential pairs (intra-pair) (S) PCB stack-up dependent
Spacing between pairs-to-pair Min. 15mils
Spacing between differential pairs and high-speed
periodic signals Min. 15mils
Spacing between differential pairs and low-speed non
periodic signals Min. 15mils
Length matching between differential pairs
(intra-pair) Max. 5mils
Length matching between differential pairs
(inter-pair) Max 1 inch
Spacing from edge of plane Min. 40mils
Via Usage Max. 2
AC coupling capacitors 100nF
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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