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36 ASUS CUV4X-C User’s Manual
3. HARDWARE SETUP
Connectors
3. H/W SETUP
10) ATX Power Supply Connector (20-pin block ATXPWR)
This connector connects to an ATX power supply. The plug from the power supply
fits in only one orientation because of the different hole sizes. Find the proper
orientation and push down firmly making sure that the pins are aligned.
IMPORTANT: Make sure that your ATX power supply can supply at least 10mA
on the +5-volt standby lead (+5VSB). You may experience difficulty in turning
the system ON if the power supply cannot support the load. For Wake-On-LAN
support, the ATX power supply must supply at least 720mA +5VSB.
11) SMBus Connector (5-1 pin SMB)
This connector allows you to connect SMBus (System Management Bus) devices.
SMBus devices communicate by means of the SMBus with an SMBus host and/
or other SMBus devices. SMBus is a specific implementation of an I
2
C bus,
which is a multi-device bus; that is, multiple chips can be connected to the same
bus and each one can act as a master by initiating data transfer.
®
CUV4X-C
CUV4X-C ATX Power Connector
+3.3 Volts
-12.0 Volts
Ground
Power Supply On
Ground
Ground
Ground
-5.0 Volts
+5.0 Volts
+5.0 Volts
Power Good
+12.0 Volts
+3.3 Volts
+3.3 Volts
Ground
+5.0 Volts
Ground
+5.0 Volts
Ground
+5V Standby
®
CUV4X-C
SMBCLK
Ground
SMBDATA
+5V
1
CUV4X-C SMBus Connector
SMB