Carrier Board Design Guide for SOM-9X35 Module
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Figure 21: Route pairs on the same layer, place same amount of vias
2.2.9.1
SOM Module Package Breakout Length Matching
As to SOM-9X35 module, high speed differential interface such as HDMI, USB ,LVDS, MIPI, and SDIO need to do
package breakout length mismatching.
Because package and PCB compensate each other in the location of package breakout.
2.2.9.2
Length Matching Except Package Breakout
The following figure shows the requirements for length matching except package breakout. The serpentine
traces should be placed at the origin of the length mismatching. This ensures that the positive and negative
signal components are propagated synchronously over the major part of the connection.
Figure 22: Add length correction to the mismatching point
Bends are a common source of length mismatching. The compensation should be placed close to the bend with
a maximum distance of 15mm.
Compensate close to bend
(max 15mm)
Figure 23: Place length compensation close to a bend