Seco CCHPC-C78-C User Manual page 53

PCI Express Transmit Pair 46+
PCI Express Transmit Pair 46-
Power Ground
Power Ground
PCI Express Transmit Pair 47+
PCI Express Transmit Pair 47-
Power Ground
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
Not Connected
Please be aware that PCI-e management on the 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).
CCHPC-C78-C
CCHPC-C78-C - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.O. - Reviewed by E.S. Copyright © 2023 SECO S.p.A.
PCIE_TX46+ B74 A74
PCIE_TX46- B75 A75
GND B76 A76
GND B77 A77
PCIE_TX47+ B78 A78
PCIE_TX47- B79 A79
GND B80 A80
PRSNT2# B81 A81
RSVD B82 A82
GND Power Ground
GND Power Ground
PCIE_RX46+ PCI Express Receive Pair 46+
PCIE_RX46- PCI Express Receive Pair 46-
GND Power Ground
GND Power Ground
PCIE_RX47+ PCI Express Receive Pair 47+
PCIE_RX47- PCI Express Receive Pair 47-
GND Power Ground
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