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.
45
Power Ground
GND
B65
A65
PCIE_RX27-
PCI Express Receive Pair 27-
PCI Express Transmit Pair 28+
PC
B66
A66
GND
Power Ground
PCI Express Transmit Pair 28-
PCIE_TX28-
B67
A67
GND
Power Ground
Power Ground
GND
B68
A68
PC
PCI Express Receive Pair 28+
Power Ground
GND
B69
A69
PCIE_RX28-
PCI Express Receive Pair 28-
PCI Express Transmit Pair 29+
PC
B70
A70
GND
Power Ground
PCI Express Transmit Pair 29-
PCIE_TX29-
B71
A71
GND
Power Ground
Power Ground
GND
B72
A72
PC
PCI Express Receive Pair 29+
Power Ground
GND
B73
A73
PCIE_RX29-
PCI Express Receive Pair 29-
PCI Express Transmit Pair 30+
PC
B74
A74
GND
Power Ground
PCI Express Transmit Pair 30-
PCIE_TX30-
B75
A75
GND
Power Ground
Power Ground
GND
B76
A76
PC
PCI Express Receive Pair 30+
Power Ground
GND
B77
A77
PCIE_RX30-
PCI Express Receive Pair 30-
PCI Express Transmit Pair 31+
PC
B78
A78
GND
Power Ground
PCI Express Transmit Pair 31-
PCIE_TX31-
B79
A79
GND
Power Ground
Power Ground
GND
B80
A80
PC
PCI Express Receive Pair 31+
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#
B81
A81
PCIE_RX31-
PCI Express Receive Pair 31-
Not Connected
RSVD
B82
A82
GND
Power Ground
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 (B81/B48/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 B81 or B48 or 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).
