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2017
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Signal
Pin # Description
I/O
PU/PD
Comment
SPI_POWER
A91
Power source for carrier board SPI BIOS flash. SPI_POWER shall be used to power
SPI BIOS flash on the carrier only.
+ 3.3VSB
BIOS_DIS0#
A34
Selection strap to determine the BIOS boot device.
I 3.3VSB
PU 10K
3.3VSB
Carrier shall be left as no-connect.
BIOS_DIS1# B88
Selection strap to determine the BIOS boot device.
I 3.3VSB
PU 10K
3.3VSB
Carrier shall be left as no-connect
Table 29 Miscellaneous Signal Descriptions
Signal
Pin # Description
I/O
PU/PD
Comment
I2C_CK
B33
General purpose I²C port clock output/input
I/O 3.3V PU 2K2 3.3VSB
I2C_DAT
B34
General purpose I²C port data I/O line
I/O 3.3V PU 2K2 3.3VSB
SPKR
B32
Output for audio enunciator, the “speaker” in PC-AT systems
O 3.3V
SPEAKER is a boot strap signal (see
note below)
WDT
B27
Output indicating that a watchdog time-out event has occurred.
O 3.3V
PD 10K
FAN_PWMOUT B101
Fan speed control. Uses the Pulse Width Modulation (PWM) technique to control
the fan’s RPM.
O OD
3.3V
FAN_TACHIN
B102
Fan tachometer input.
I OD
PU 10K 3.3V
Requires a fan with a two pulse output.
TPM_PP
A96
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 9.2 “Boot Strap Signals”.
Table 30 General Purpose I/O Signal Descriptions
Signal
Pin # Description
I/O
PU/PD
Comment
GPO0
A93
General purpose output pins.
Shared with SD_CLK. Output from COM Express, input to SD
O 3.3V
GPO1
B54
General purpose output pins.
Shared with SD_CMD. Output from COM Express, input to SD
O 3.3V
GPO2
B57
General purpose output pins.
Shared with SD_WP. Output from COM Express, input to SD
O 3.3V
GPO3
B63
General purpose output pins.
Shared with SD_CD. Output from COM Express, input to SD
O 3.3V