Kontron COMe Starterkit Eval T2 - Manual (Page 169)

Power and Reset
3.5.5. Slot Card Supply Decoupling Recommendations
Implementing PCI Express connectors on the Carrier Board requires decoupling of the
connector supply voltages to reduce possible voltage drops and to provide an AC return path
in a manner consistent with high-speed signaling techniques. Decoupling capacitors should
be placed as close as possible to the power pins of the connectors. Table 58 below shows
the minimum requirements for power decoupling of the different power pin types of each PCI
Express connector type.
Table 58: PCIe High Frequency Decoupling Requirements
Power Pin
Type PCIe x1, x4
Connector PCIe x16
Connector ExpressCard
Connector PCIe Mini Card
Connector
VCC_12V 1x 22µF, 2x 100nF 4x 22uF, 2x 100nF - -
VCC_3V3 1x 22uF, 2x 100nF 1x 100uF, 2x 100nF - -
VCC_3V3_SB 1x 22uF, 2x 100nF 1x 22uF, 2x 100nF - -
VCC_1V5 - - - -
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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