Motherboard Description
1.8 Hardware Monitor Subsystem (Optional)
The hardware monitor subsystem provides low-cost instrumentation capabilities. The features of
the hardware monitor subsystem include:
? Management Level 4 functionality
? Hardware Monitor ASIC
3 Integrated temperature, voltage monitoring (+12 V, +5 V, +3.3 V, +1.5 V, and VCCP), and
fan speed to detect levels above or below acceptable values. When the acceptable values
for temperature, voltage, or fan speed are exceeded, an interrupt is activated.
3 Two fan speed sensors.
3 Access through the SMBus.
??
? Remote reset capabilities from a remote peer or server through Intel LANDesk Client
Manager 3.3 (or later) and service layers
? Chassis intrusion connector
The hardware monitor subsystem supports a chassis security feature: if the chassis cover is
removed, a System Management Interrupt (SMI) is logged. The security feature uses a mechanical
switch on the chassis that is attached to motherboard?s 1 x 2-pin chassis intrusion connector
(J2D2). Electrically, the mechanical switch is open for normal computer operation. See
Section 1.13 for the location and pinouts of the chassis intrusion connector.
1.9 Instantly Available Technology (Optional)
Instantly Available technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep
state. While in the S3 sleep state, the system will appear to be off. When signaled by a wake up
device or event, the system quickly returns to its last known wake state. Table 52 on page 69 lists
the devices and events that can wake the computer from the S3 state.
The board supports the PCI Bus Power Management Specification and the 3.3V Aux ECR. For
information on the versions of these specifications, see Section 6.2. Add-in boards that also
support these specifications can participate in power management and can be used to wake the
system.
The optional standby power LED, located between the DIMM sockets and processor connector
provides an indication that power is still present to the DIMMs and PCI slots, even when the
system appears to be off.
CAUTION
When the board is installed in a chassis, it is neccesary to remove the chassis cover to see the state
of the LED. Disconnect the power cord to the system prior to removing the chassis cover. Failure
to do so could damage the motherboard, any installed memory, PCI add-in boards, or the power
supply.
/NOTE
To support Instantly Available technology, the power supply must be capable of providing enough
stand-by current from the 5 V stand-by source. 720 mA is usually sufficient, but his depends on
wake devices supported and manufacturing options.
25 |
ACEC
