307013-003 Datasheet, PDF (179/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Functional Description
Note:
Note:
5.15.1.3
5.15.2
If the INTRUDER# signal goes inactive some point after the INTRD_DET bit is written
as a 1, then the INTRD_DET signal will go to a 0 when INTRUDER# input signal goes
inactive. Note that this is slightly different than a classic sticky bit, since most sticky
bits would remain active indefinitely when the signal goes active and would
immediately go inactive when a 1 is written to the bit.
The INTRD_DET bit resides in the ICH7’s RTC well, and is set and cleared
synchronously with the RTC clock. Thus, when software attempts to clear INTRD_DET
(by writing a 1 to the bit location) there may be as much as two RTC clocks (about 65
µs) delay before the bit is actually cleared. Also, the INTRUDER# signal should be
asserted for a minimum of 1 ms to ensure that the INTRD_DET bit will be set.
If the INTRUDER# signal is still active when software attempts to clear the INTRD_DET
bit, the bit remains set and the SMI is generated again immediately. The SMI handler
can clear the INTRD_SEL bits to avoid further SMIs. However, if the INTRUDER# signal
goes inactive and then active again, there will not be further SMIs, since the
INTRD_SEL bits would select that no SMI# be generated.
Detecting Improper Firmware Hub Programming
The ICH7 can detect the case where the Firmware Hub is not programmed. This results
in the first instruction fetched to have a value of FFh. If this occurs, the ICH7 sets the
BAD_BIOS bit, which can then be reported via the Heartbeat and Event reporting using
an external, Alert on LAN* enabled LAN controller (See Section 5.15.2).
Heartbeat and Event Reporting via SMBus (Desktop and
Mobile Only)
The ICH7 integrated LAN controller supports ASF heartbeat and event reporting
functionality when used with the 82562EM or 82562EX Platform LAN Connect
component. This allows the integrated 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.
All heartbeat and event messages are sent on the SMBus interface. This allows an
external LAN controller to act upon these messages if the internal LAN controller is not
used.
The basic scheme is for the ICH7 integrated LAN controller to send a prepared Ethernet
message to a network management console. The prepared message is stored in the
non-volatile EEPROM that is connected to the ICH7.
Messages are sent by the LAN controller either because a specific event has occurred,
or they are sent periodically (also known as a heartbeat). The event and heartbeat
messages have the exact same format. The event messages are sent based on events
occurring. The heartbeat messages are sent every 30 to 32 seconds. When an event
occurs, the ICH7 sends a new message and increments the SEQ[3:0] field. For
heartbeat messages, the sequence number does not increment.
Intel ^® ICH7 Family Datasheet
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