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3.3.2.3 PCI-e x16 Slots
The HC78 board offer the possibility of additional expansion through two standard PCI-e x16 card edge connectors
CN13 and CN72.
PCI-e x16 slots are type LOTES p/n APCI0599-P002C01or equivalent, with the pinout shown in the following tables.
It is also possible to use this connector to increase the graphical capabilities of the board by using PCI-e lanes #16..#31
as PCI Express Graphics x16 bus (PEG) interface.
Associated to PCI-e x16 slot CN13, a dedicated 2-way jumper, JP17, allows to force the Lane reversal order
JP17 position
PEG LANE Order
Not inserted
Normal PEG Lane Order
Inserted
Reversed PEG Lane Order
Please be aware that availability of these PCI express lanes depends on the COM HPC module used.
Please check the User Manual of the COM HPC module used for details about the availability of these lanes and all possible groupings that can be applied to these
lanes.
Description
+12V Power Rail
+12V Power Rail
+12V Power Rail
Power Ground
SM Bus Clock line. +3.3V_RUN electrical level with
up resistor, derived by SMB_CK with
mosfet voltage level converter
SM Bus Data line. +3.3V_RUN electrical level with
up resistor, derived by SMB_DAT with
mosfet voltage level converter
Power Ground
+3.3V Power Rail
TRST#, tied to GND with 4K7Ω resistor
+3.3V Auxiliary Power Rail
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.
PCI Express Graphics x16 Slot- CN13
Pin name
Pin nr.
Pin nr.
+12V_RUN
B1
A1
+12V_RUN
B2
A2
+12V_RUN
B3
A3
GND
B4
A4
PCIE_ SMB_CLK
B5
A5
PCIE_ SMB_DAT
B6
A6
GND
B7
A7
+3.3V_RUN
B8
A8
JTAG1
B9
A9
+3.3V_ALW
B10
A10
Pin name
Description
GND
Hot Plug presence detect (tied to GND)
+12V_RUN
+12V Power Rail
+12V_RUN
+12V Power Rail
GND
Power Ground
JTAG2
TCK, tied to GND with 4K7Ω resistor
JTAG3
TDI, tied to +3.3V_RUN with 4K7Ω resistor
JTAG4
Test Data Out, not connected
JTAG5
TMS, tied to +3.3V_RUN with 4K7Ω resistor
+3.3V_RUN
+3.3V Power Rail
+3.3V_RUN
+3.3V Power Rail
46
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