User guide

1-16 Chapter 1: Product introduction
2. USB device wake-up (3-pin USBPW12, USBPW34, USBPW56)
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 USBPW_12 and USBPW_34 jumpers are for the rear USB ports. The
USBPW_56 jumper 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 1A on the
+5VSB lead when these jumpers are set to +5VSB. Otherwise, the system
would not power up.
• The total current consumed must NOT exceed the power supply capability
(+5VSB) whether under normal condition or in sleep mode.
P4SP-MX
®
P4SP-MX USB Device Wake Up
+5V
(Default)
1
2
+5VSB
32
USBPWR_12
USBPWR_34
+5V
(Default)
1
2
+5VSB
32
USBPWR_56