2.Keyboard power (3-pin KBPWR)

This jumper allows you to enable or disable the keyboard wake-up feature. Set this jumper to pins 2-3 (+5VSB) if you wish to wake up the computer when you press a key on the keyboard (the default value is [Disabled]). This feature requires an ATX power supply that can supply at least 1A on the +5VSB lead, and a corresponding setting in the BIOS (see section 2.5.5 APM Configuration).

KBPWR

2

3

2

1

 

+5V

+5VSB

(Default)

 

K8V-MX

K8V-MX Keyboard power setting3.USB device wake-up (3-pin USBPWR12, USBPWR34, USBPWR56, USBPWR78)

Set these jumpers to +5V to wake up the computer from S1 sleep mode (CPU stopped, DRAM refreshed, system running in low power mode) using the connected USB devices. Set to +5VSB to wake up from S3 sleep mode (no power to CPU, DRAM in slow refresh, power supply in reduced power mode).

The USBPWR12 and USBPWR34 jumpers are for the rear USB ports. The USBPWR56 and USBPWR78 jumpers are for the internal USB connectors that you can connect to additional USB ports.

 

 

USBPW12

 

 

 

USBPW34

 

 

1

2

2

3

 

+5V

+5VSB

 

(Default)

 

 

 

 

USBPW78

 

 

1

USBPW56

3

K8V-MX

2

2

 

 

 

 

K8V-MX USB device wake-up

+5V

+5VSB

(Default)

 

 

•The USB device wake-up feature requires a power supply that can provide

500mA on the +5VSB lead for each USB port; otherwise, the system would not power up.

•The total current consumed must NOT exceed the power supply capability (+5VSB) whether under normal condition or in sleep mode.

1-18

Chapter 1: Product Introduction