Kontron COMe Starterkit Eval T2 - Manual (Page 124)

COM Express Interfaces
2.19.2. Routing Considerations
The SMBus should be connected to all or none of the PCIe/PCI devices and slots. A general
recommendation is to not connect these devices to the SMBus.
The maximum load of SMBus lines is limited to 3 external devices. Please contact your Module
vendor if more devices are required.
Do not connect Non-Suspend powered devices to the SMBus unless a bus switch is used to
prevent back feeding of voltage from the Suspend rail to other supplies.
Contact your Module vendor for a list of SMBus addresses used on the Module. Do not use the
same address for Carrier located devices.
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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