Table 14
Miscellaneous Signal Descriptions
Signal
Description
I/O
PU/PD
Comment
GND
Ground. All GND pins should be
connected to the baseboard ground plane.
P
5V_SB
Additional Power input for the internal
suspend and power-control circuitry. This
Signal is connected to XTX-Connector
X4/Pin3. Refer to XTX Specification for
further details.
P
VCC
5V Power Input. All VCC pins should be
connected to the baseboard 5 Volt power
plane.
P
SUS_STAT#
Suspend Status: indicates that the system
will be entering a low power state soon.
O 3.3V
PD 1k
SUS_STAT# is a boot
strap signal (see note
below)
SLP_S3#
S3 Sleep Control: This signal shuts off
power to all non-critical systems when in
S3 (Suspend to Ram), S4 or S5 states.
O 3.3VSB PU 10k 3.3VSB
SLP_S5#
S5 Sleep Control: This signal shuts off
power to all non-critical systems when in
S5 (Soft Off) state.
O 3.3V
PU 10k 3.3VSB Only supported on
hardware revisions B.0
and later.
PCI_CLKRUN#
PCI Clock Run: This signal is used to
support PCI Clock Run protocol. It
connects to PCI devices that need to
request clock re-start, or prevention of
clock stopping.
N.C.
Not supported
PCI_GNT#A
reserved
N.C.
Not supported
PCI_REQ#A
reserved
N.C.
Not supported
FAN_PWMOUT
Fan speed control. Uses the Pulse Width
Modulation (PWM) technique to control the
Fan's RPM.
O 5V
FAN_TACHOIN
Fan tachometer input.
I 5V
WDTRIG
Watchdog Trigger Signal.
I 5V
PU 10k 5V
PP_TPM
Physical Presence pin of Trusted Platform
Module (TPM). Active high. TPM chip has
an internal pull-down. This signal is used
to indicate Physical Presence to the TPM.
I 3.3V
Trusted Platform Module
chip is optional.
Note
Some signals have special functionality during the reset process. They may bootstrap
some basic important functions of the module. For more information refer to section 6.8
of this user's guide.
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