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Chapter 5 Ports and Connectors
Chapter 5
SMBus Connector
SMBus
GND
+3.3V_standby
SMBUS Data
SMBUS Clock
NC
SMBUS_Alert
1
2
5
6
The SMBus (System Management Bus) connector is used to connect SMBus devices. It is a
multiple device bus that allows multiple chips to connect to the same bus and enable each one
to act as a master by initiating data transfer.
Front Panel Connector
HDD-LED - HDD LED
This LED will light when the hard drive is being accessed.
RESET SW - Reset Switch
This switch allows you to reboot without having to power off the system.
PWR-BTN - Power Switch
This switch is used to power on or off the system.
PWR-LED - Power/Standby LED
When the system’s power is on, this LED will light. When the system is in the S1 (POS - Power
On Suspend) state, it will blink every second. When the system is in the S3 (STR - Suspend To
RAM) state, it will blink every 4 seconds.
HDD-LED
RESET-SW
PWR-LED
PWR-BTN
12
11
2
1
Pin Pin Assignment
Pin Pin Assignment
HDD-LED
3
HDD Power
PWR-LED
2
LED Power
5
Signal
4
LED Power
RESET SW
7
Ground
6
Signal
9
RST Signal
PWR-BTN
8
Ground
11 N.C.
10 Signal
Front
Panel
