1.9Jumpers

This section describes and illustrates the jumpers on the motherboard.

1.USB device wake-up (3-pin USBPWR_12,USBPWR_34,USBPWR_56)

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 USBPWR_12 and USBPWR_34 jumpers are for the rear USB port. USBPWR_56 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 2A on the +5VSB lead when these jumpers are set to +5VSB. Otherwise, the system does not power up.

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

 

 

USBPWR_12

 

 

 

USBPWR_34

 

 

1

2

2

3

 

 

+5V

+5VSB

 

(Default)

 

 

 

 

USBPWR_56

 

A7N8X-X

1

 

 

 

 

2

 

2

 

 

 

 

3

 

 

 

+5V

+5VSB

A7N8X-X USB Device Wake Up

(Default)

 

 

 

 

 

 

2.Central Processing Unit FSB (CPU_FSB)

This jumper when set to 1-2 pins (default), enable support for Front Side Bus 400/333/266. When set to pins 2-3, it sets support for FSB 200 only.

CPU_FSB

 

1

2

 

2

 

 

3

A7N8X-X

FSB400/333/266

FSB200

 

(Default)

A7N8X-X CPU FSB Jumper Setting

1-10

Chapter 1: Motherboard Information