Specifications
T4G Technical Reference
TRENTON Technology Inc.
1-8
S
YSTEM
H
ARDWARE
M
ONITOR
The system hardware monitoring system monitors system voltages, temperature and fan
speeds.
The circuitry is based on Winbond’s W83783S hardware monitoring IC that is interfaced
via the system’s SMBus. System voltages of +12V, +5V, +3.3V, +2.5V, VCCORE
(processor voltage) and -12V are monitored. Each of these six voltages has program-
mable “high” and “low” watchdog limits. Also monitored are the processor die temper-
ature and the fan speed associated with the processor’s active heatsink thermal solution.
Programmable watchdog limits are also associated with fan speed RPMs. When any of
these programmed limits are exceeded, monitor software can be used to report the out-
of-limit condition.
The System Hardware Monitor connector (P18) provides an external interface for user
functionality. Pin assignments for this connector are as follows:
PCI E
THERNET
I
NTERFACE
The PCI Ethernet interface is implemented using an Intel 82562ET 10/100Base-T
Ethernet controller which supports 10Base-T and 100Base-TX Fast Ethernet modes.
The interface is compliant with IEEE 802.3.
The main components of this interface are:
•
Intel 82801DB for 10/100-Mb/s media access control (MAC), a serial ROM
port and a PCI Bus Master interface
Pin #/Definition
Description
Pin 1 - GND
System Ground
Pin 2 - GPO
General Purpose Output
Active low open drain output. This multi-
function output is controlled by the W38383S’s
configuration register at offset 40(h) and the
control register at 4D(h). It can be used as a
general-purpose output or programmed to
provide a beep function that can be used as a
watchdog warning signal. This output is open
drain.
Pin 3 - CI
Chassis Intrusion Input
Active low input from an external circuit, which
can be used to indicate a chassis intrusion event.
This input line is connected directly to the
ICH’s System Management Interface’s
INTRUDER# input. It can be set to disable the
system if the chassis is open or can be used as a
general-purpose input if intruder detection is
not used.
Pin 4 - OVT
Over Temperature
This active low, open drain output can be used
to indicate that an over-temperature condition
exists.
