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Chapter 3 Hardware Installation
24
Chapter 3
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Signal
Pin#
Pin Type
Pwr Rail /Tolerance
KB968
Carrier Board
Description
I2C_CK
B33
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K to 3.3VSB
General purpose I2C port clock output
I2C_DAT
B34
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K to 3.3VSB
General purpose I2C port data I/O line
SPKR
B32
O CMOS
3.3V / 3.3V
Output for audio enunciator - the "speaker" in PC-AT systems.
This port provides the PC beep signal and is mostly intended for
debugging purposes.
WDT
B27
O CMOS
3.3V / 3.3V
Output indicating that a watchdog time-out event has occurred.
FAN_PWNOUT
B101
O CMOS
3.3V / 12V
PD 100K to GND
Do NOT PU
Fan speed control. Uses the Pulse Width Modulation (PWM) technique to control the fan's RPM.
FAN_TACHIN
B102
I OD CMOS
3.3V / 12V
PU 10K to 3.3V
Fan tachometer input for a fan with a two pulse output.
TPM_PP
A96
I CMOS
3.3V / 3.3V
Trusted Platform Module (TPM) Physical Presence pin. Active high.
TPM chip has an internal pull down. This signal is used to indicate
Physical Presence to the TPM.
Signal
Pin#
Pin Type
Pwr Rail /Tolerance
KB968
Carrier Board
Description
PWRBTN#
B12
I CMOS
3.3V Suspend/3.3V
PU 10K to 3.3VSB
A falling edge creates a power button event. Power button events can
be used to bring a system out of S5 soft off and other suspend states,
as well as powering the system down.
SYS_RESET#
B49
I CMOS
3.3V Suspend/3.3V
PU 40-50K to 3.3VSB
Reset button input. Active low request for Module to reset and reboot.
May be falling edge sensitive. For situations when SYS_RESET# is
not able to reestablish control of the system, PWR_OK or a power
cycle may be used.
CB_RESET#
B50
O CMOS
3.3V Suspend/3.3V
PD 100K to GND
Reset output from Module to Carrier Board. Active low. Issued by
Module chipset and may result from a low SYS_RESET# input, a low
PWR_OK input, a VCC_12V power input that falls below the minimum
specification, a watchdog timeout, or may be initiated by the Module
software.
PWR_OK
B24
I CMOS
3.3V / 3.3V
PU 10K to 3.3V
Power OK from main power supply. A high value indicates that the
power is good. This signal can be used to hold off Module startup to
allow Carrier based FPGAs or other configurable devices time to be
programmed.
SUS_STAT#
B18
O CMOS
3.3V Suspend/3.3V
Indicates imminent suspend operation; used to notify LPC devices.
SUS_S3#
A15
O CMOS
3.3V Suspend/3.3V
Indicates system is in Suspend to RAM state. Active low output. An
inverted copy of SUS_S3# on the Carrier Board may be used to
enable the non-standby power on a typical ATX supply.
SUS_S4#
A18
O CMOS
3.3V Suspend/3.3V
Indicates system is in Suspend to Disk state. Active low output.
SUS_S5#
A24
O CMOS
3.3V Suspend/3.3V
Indicates system is in Soft Off state.
WAKE0#
B66
I CMOS
3.3V Suspend/3.3V
PU 10K to 3.3VSB
PCI Express wake up signal.
WAKE1#
B67
I CMOS
3.3V Suspend/3.3V
PU 40-50K to 3.3VSB
General purpose wake up signal. May be used to implement wake-up
on PS2 keyboard or mouse activity.
BATLOW#
A27
I CMOS
3.3V Suspend/ 3.3V
PU 10K to 3.3VSB
Indicates that external battery is low.
This port provides a battery-low signal to the Module for orderly
transitioning to power saving or power cut-off ACPI modes.
LID#
A103
I OD CMOS
3.3V Suspend/12V
LID switch. Low active signal used by the ACPI operating system for a LID switch.
SLEEP#
B103
I OD CMOS
3.3V Suspend/12V
PU 10K to 3.3VSB
Sleep button. Low active signal used by the ACPI operating system to bring the
system to sleep state or to wake it up again.
THRM#
B35
I CMOS
3.3V / 3.3V
PU 10K to 3.3V
Input from off-Module temp sensor indicating an over-temp situation.
THRMTRIP#
A35
O CMOS
3.3V / 3.3V
PU 10K to 3.3V
NA
Active low output indicating that the CPU has entered thermal shutdown.
SMB_CK
B13
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K to 3.3VSB
System Management Bus bidirectional clock line.
SMB_DAT
B14
I/O OD CMOS 3.3V Suspend/3.3V
PU 2.2K to 3.3VSB
System Management Bus bidirectional data line.
SMB_ALERT#
B15
I CMOS
3.3V Suspend/3.3V
System Management Bus Alert – active low input can be used to
generate an SMI# (System Management Interrupt) or to wake the system.
Power and System Management Signals Descriptions
Miscellaneous Signal Descriptions