Instruction Manual

1-12

Chapter 1: Product introduction

H81M-A

1 2

2 3

+5V

+5VSB

(Default)

KB_USBPWB

H81M-A Keyboard and USB device wake up

H81M-A

2 3

+5V

(Default)

+5VSB

USBPWF

H81M-A USB Device Wake Up

3. USB device wake-up (3-pin USBPWF)

Set this jumper 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).

2. Keyboard & USB device wake-up (3-pin KB_USBPWB)

Set this jumper 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).

• 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 conditions or in sleep mode.