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6. 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). All three 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
ports. The USBPWR_56 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
2. The total current consumed must NOT exceed the power supply
P4B533-E
®
P4B533-E USB Device Wake Up
2-20
on the +5VSB lead when these jumpers are set to +5VSB.
Otherwise, the system does not power up.
capability (+5VSB) whether under normal condition or in sleep
mode.
USBPWR_34
3
2
2
1
+5V
+5VSB
(Default)
USBPWR_12
1 2
2 3
+5V
+5VSB
(Default)
USBPWR_56
1 2
2 3
+5V
+5VSB
(Default)
Chapter 2: Hardware information
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