CCOMe-C79
CCOMe-C79 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by E.S. Copyright © 2021 SECO S.p.A.
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Power Ground
GND
B18
A18
GND
Power Ground
PCI-e Transmitter lane 5+
P
B19
A19
RSVD
Not Connected
PCI-e Transmitter lane 5-
PCIE_TX5-
B20
A20
GND
Power Ground
Power Ground
GND
B21
A21
P
PCI-e Receiver lane 5+
Power Ground
GND
B22
A22
PCIE_RX5-
PCI-e Receiver lane 5-
PCI-e Transmitter lane 6+
P
B23
A23
GND
Power Ground
PCI-e Transmitter lane 6-
PCIE_TX6-
B24
A24
GND
Power Ground
Power Ground
GND
B25
A25
P
PCI-e Receiver lane 6+
Power Ground
GND
B26
A26
PCIE_RX6-
PCI-e Receiver lane 6-
PCI-e Transmitter lane 7+
P
B27
A27
GND
Power Ground
PCI-e Transmitter lane 7-
PCIE_TX7-
B28
A28
GND
Power Ground
Power Ground
GND
B29
A29
P
PCI-e Receiver lane 7+
Not Connected
RSVD
B30
A30
PCIE_RX7-
PCI-e Receiver lane 7-
Hot Plug presence detect. Input Signal from add in
card used to enable the reference clock of this slot.
Active low signal, +3.3V_RUN electrical level with a
10k
PRSNT2#
B31
A31
GND
Power Ground
Power Ground
GND
B32
A32
RSVD
Not Connected
Please be aware that PCI-e management on CCOMe-C79 carrier board requires that the add-in card placed on this slot manages the Presence Detect
pins (B31/B17 and A1). More exactly, according to the PCI Express Card Electromechanical Specification v3.0, it is required that these pins are tied
together on the ADD-in Card (at least, it is needed that pin A1 is connected with pin B17 or pin B31).
In case that these pins are not tied together on the add-in card, then the carrier board will not acknowledge the presence of the card in the slot, and will
not enable the reference clock (and the add-in card will not work).
