User's Manual

BoltGATE 20-31 User's manual EN 11 Product installation and power supply
© 2022 Eurotech SpA - Via Fratelli Solari 3/A - 33020 AMARO (UD) - Italy
Code: BTGATE-20-31_MAN_EN_1-6
Revision: 1-6 2022.07.28
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11.5.3 Main CPU Module and Expansion Modules electrical interconnections
The electrical interconnections between the Main CPU Module and the Expansion Modules is made
using high speed card edge connectors, coupled using a PCB.
Each Expansion Module has two card edge connectors:
l
the upstream port, on the left side: it allows you to connect the Main CPU Module, and
l
the downstream port, on the right side: it allows you to connect a further Expansion Module.
The Main CPU Module has only the downstream port, thus it is always the leftmost Module in the
installation.
Upstream and downstream ports share the same pinout and signals: there is a logical pass-through
connection of the signals from the upstream port to the downstream port.
The signals carried on the card edge connectors are:
l
Communication signals:
o
1x PCI Express lane
o
1x I2C
l
I/O signals:
o
Used for several purposes, depending on the module
l
Power signals:
o
+5 VDC
o
+12 VDC
o
Power-good output
o
Suspend input
Fig. 4 - Example of modules electrical interconnection