Power Management; Motherboard - Sun Microsystems Ultra 2 series Service Manual

C.3

Power Management

To meet EPA Energy Star requirements, the system unit power consumption is lower
than 30 watts.
In system unit software monitors system unit activity and based on the system unit
control settings, system unit software saves the machine state (including the
memory) onto the hard drive and halts the operation system. The system unit
software then turns off the power supply.
Based on the setting of the NVRAM/TOD, which has an alarm clock, the system
unit is turned on automatically if the alarm is set. This is done by having the
interrupt out of the NVRAM/TOD directly connected to the power supply. The
power supply requires a power_off signal for the system unit software to be able to
write to a bit within a register and have the power supply shut down.
Note –
If you experience RED State Exception failures when exercising Energy Star
suspend/resume functions, install patch 104729-01. An alternative is to install the
Solaris 2.5.1 Hardware: 4/97 release, which also incorporates a correction to this
problem.
C.4

Motherboard

The following figure illustrates a block diagram of the Ultra 2 series motherboard.
C-28 Sun Ultra 2 Series Service Manual • July 1996
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