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

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).

NCCH-DL

NCCH-DL USB device wake up

USBPW12

 

3

2

2

1

 

+5V

+5VSB

(Default)

 

USBPW34

 

3

2

2

1

 

+5V

+5VSB

(Default)

 

1. 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.

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

4.CPU external frequency selection (6-pin J1)

This jumper allows you to select the CPU external frequency (or bus clock).

To ensure system stability, it is recommened that you keep the default setting.

NCCH-DL

J1

2

4

6

2

4

6

2 4

6

1

3

5

1

3

5

1 3

5

Auto-detect

100 MHz

133 MHz

CPU FSB

 

 

 

 

 

 

(Default)

2

4

6

2

4

6

 

 

 

1

3

5

1 3

5

 

 

 

166 MHz

200 MHz

NCCH-DL CPU external frequency selection

ASUS AP1720-E2 barebone server

4-5