Functional Description
184 Datasheet
In TCO Legacy/Compatible mode the PCH can function directly with an external LAN
controller or equivalent external LAN controller to report messages to a network
management console without the aid of the system processor. This is crucial in cases
where the processor is malfunctioning or cannot function due to being in a low-power
state. Table 5-40 includes a list of events that will report messages to the network
management console.
NOTE: The GPIO11/SMBALERT# pin will trigger an event message (when enabled by the
GPIO11_ALERT_DISABLE bit) regardless of whether it is configured as a GPI or not.
Figure 5-5. TCO Legacy/Compatible Mode SMBus Configuration
Host SMBus
TCO Slave
SPD
(Slave)
uCtrl
Legacy Sensors
(Master or Slave
with ALERT)
TCO Legacy/Compatible Mode
SMBus
X
Intel ME SMBus
Controller 3
X
X
PCI/PCIe*
Device
3
rd
Party
NIC
PCH
Intel ME SMBus
Controller 1
Intel ME SMBus
Controller 2
Table 5-40. Event Transitions that Cause Messages
Event Assertion? deassertion? Comments
INTRUDER# pin yes no Must be in “S1 or hung S0” state
THRM# pin yes yes
Must be in “S1 or hung S0” state. Note that
the THRM# pin is isolated when the core
power is off, thus preventing this event in
S3–S5.
Watchdog Timer
Expired
yes no (NA) “S1 or hung S0” state entered
GPIO[11]/
SMBALERT# pin
yes yes Must be in “S1 or hung S0” state
BATLOW# yes yes Must be in “S1 or hung S0” state
CPU_PWR_FLR yes no “S1 or hung S0” state entered
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