Kontron COMe Starterkit Eval T2 - Manual (Page 189)

Carrier Board PCB Layout Guidelines
6.5.9. LVDS Trace Routing Guidelines
Table 68: LVDS Trace Routing Guidelines
Parameter Trace Routing
Maximum signal line length to the LVDS connector
(coupled traces) 8.75 inches
Signal length used on COM Express Module
(including the COM Express Carrier Board connector) 2.0 inches
Signal length to the LVDS connector available for the COM
Express Carrier Board 6.75 inches
Differential Impedance 100 Ω +/-20%
Single-ended Impedance 55 Ω +/-15%
Trace width (W) PCB stack-up dependent
Spacing between differential pair signals (intra-pair) (S) PCB stack-up dependent
Spacing between pair to pairs (inter-pair) (s) Min. 20mils
Spacing between differential pairs and high-speed periodic
signals Min. 20mils
Spacing between differential pairs and low-speed non
periodic signals Min. 20mils
Length matching between differential pairs (intra-pair) +/- 20mils
Length matching between clock and data pairs (inter-pair) +/- 20mils
Length matching between data pairs (inter-pair) +/- 40mils
Spacing from edge of plane +/- 40mils
Reference plane GND referenced preferred
Via Usage Max. of 2 vias per line
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
189/218