SMC Networks P4B-E Figure 2-25USB Device Wake-upSettings, 4.USB device wake-up (3-pinUSBPWR01, USBPWR23)

4.USB device wake-up (3-pin USBPWR01, USBPWR23)

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 USBPWR01 jumper is for the rear USB ports. The USBPWR23 jumper is for the internal USB header that you can connect to the front USB ports.

1. 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 does not power up.

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

	USBPWR01
	2	3
		2
	1
	+5V	+5VSB
P4B-E	(Default)

USBPWR23

1 2 2 3

+5V+5VSB (Default)

P4B-E USB Device Wake Up

Figure 2-25 USB Device Wake-up Settings

2-20 Chapter 2: Hardware information