Kontron COMe Starterkit Eval T2 Uživatelský manuál stáhnout pdf (Strana 172)

COM Express Module Connectors

peg location holes in the PCB connector pattern are in the correct positions (as shown in the land

pattern of the COM Express Specification) and if the holes are drilled to the proper size and

tolerance by the PCB fabricator.

5.3. Connector and Module CAD Symbol Recommendations

The 440-pin COM Express connector should be shown in the Carrier Board CAD system as a

single schematic symbol and a single PCB symbol, rather than as a pair of 220-pin symbols.

This ensures that the relative position of the two 220-pin connectors remains correct as PCB

placement for the Carrier Board is done.

It also is very advantageous to extend this concept to include the COM Express Module outline

and the Module mounting holes in the same PCB land pattern. This allows PCB designers to

easily move the entire Module around to try placement options without losing the relative

positions and orientations of the Module connectors, mounting holes, and Module outline.

PICMG

COM Express

Carrier Board Design Guide Rev. 2.0 / December 6, 2013

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Kontron COMe Starterkit Eval T2 Uživatelský manuál Strana 172