2. USB devi ce wake-up (3-pi n USBPW12, USBPW34, USBPW56, USBPW78)

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 and S4 sleep modes (no power to CPU, DRAM in slow refresh, power supply in reduced power mode).

 

 

USBPW12

 

 

 

USBPW34

 

 

1

2

2

3

 

+5V

+5VSB

 

(Default)

 

 

 

 

USBPW78

 

A8S-X SE

 

USBPW56

 

1

2

2

3

 

+5V +5VSB

A8S-X SE USB Device Wake Up (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.

1-20

Chapter 1: Product introduction