Advantech SOM-5992 Design Manual page 35

Signal
PCIE_RX30+
PCIE_RX30-
PCIE_TX30+
PCIE_TX30-
PCIE_RX31+
PCIE_RX31-
PCIE_TX31+
PCIE_TX31-
PCIE_CLK_REF+
PCIE_CLK_REF-
Notes:
1. SOM-5992 Default : I210.
2. Only support PCIe Gen2.
3. The AC Coupling cap 0.1uF is used for Gen2 and 0.22uF is used for Gen3.
Pin# Description
C98 PCIe channel 30. Receive Input differential pair.
C99 Carrier Board:
Device - Connect AC Coupling cap
to PCIE device PETp/nX.
N/C if not used.
D98 PCIe channel 30. Transmit Output differential pair.
D99 Module has integrated AC Coupling Capacitor.
Carrier Board:
Device - Connect to PCIE device PERp/nX.
N/C if not used.
C101 PCIe channel 31. Receive Input differential pair.
C102 Carrier Board:
Device - Connect AC Coupling cap
to PCIE device PETp/nX.
N/C if not used.
D101 PCIe channel 31. Transmit Output differential pair.
D102 Module has integrated AC Coupling Capacitor.
Carrier Board:
Device - Connect to PCIE device PERp/nX.
N/C if not used.
A88 PCIe Reference Clock for all COM Express PCIe
A89 lanes, and for PEG lanes.
Carrier Board:
Connect 0Ω in series to
Device - PCIE device REFCLK+, REFCLK-.
Slot - PCIE Conn pin A13 REFCLK+, A14
REFCLK-.
*Connect to PCIE Clock Buffer input to provide
PCIE clocks output for more than one PCIE devices
or slots.
N/C if not used.
0.1/0.22uF
0.1/0.22uF
３３
I/O Note
I PCIE
3
near
O PCIE
3
I PCIE
3
near
O PCIE
3
O PCIE