Connect Tech - COM Express Type-6 PMC/XMC Carrier Board - User Manual
Revision 0.03
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PMC / XMC Expansion Slots
The
COM Express Type-6 PMC/XMC Carrier
provides two VITA 42 PMC/XMC expansion slots. Each of
these slots are provided with a 32-Bit PCI connection and a x8 PCI Express connection. The PMC (PCI)
connection is sourced through a PCIe to PCI bridge through the PCIe x1 – 1 link on the COM Express
module. The XMC (PCIe) connection is sourced through PEG connection on COM Express module. The
16 lanes of the PEG connection are split into two x8 PCIe lane connections (one x8 to each slot).
Module BIOS Configuration
In order to properly use both PMC / XMC expansion slots, your modules BIOS must configure its PEG link
to be configured as 2 x8 PCIe links. Some modules allow this configuration to be done via the BIOS
settings, other require a special utility to be run for configuration. Please consult with your COM Express
modules Manual for full details on configuring the COM Express PEG as split x8 PCIe links.
Function PMC / XMC
Location
J15A/B, J11A/B, J12A/B
Type
Part Number: ASP-103612-
04, 71439-0164
Pinout
Standard PMC and XMC
pinouts used.
Refer to IEEE Std 1386.1-
2001 for PMC. VITA 42.3
for XMC for complete
pinouts.
XMC +VPWR Selection
By default
COM Express Type-6 PMC/XMC Carrier
is populated to set the XMC slot’s +VPWR rail to
+12V. There is also an option to populate this to +5V power if needed via 0ohm resistors.
