2.USB device wake-up (3-pin USBPW12, USBPW34, USBPW56)

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). Both jumpers are set to pins 1-2 (+5V) by default because not all computers have the appropriate power supply to support this feature.

The USBPW_12 and USBPW_34 jumpers are for the rear USB ports. The USBPW_56 jumper is for the internal USB header that you can connect to the front USB ports.

• This feature requires a power supply that can provide at least 1A on the +5VSB lead when these jumpers are set to +5VSB. 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.

 

 

USBPWR_34

 

 

 

USBPWR_12

 

 

1

2

2

3

 

 

+5V

+5VSB

 

(Default)

 

 

 

 

USBPWR_56

 

P4SP-MX SE

1

2

2 3

 

 

+5V

+5VSB

P4SP-MX SE USB device wake up

(Default)

 

 

1-16

Chapter 1: Product introduction