Table 21
SPI BIOS Flash Interface Signal Descriptions
Signal
Pin # Description
SPI_CS#
B97
Chip select for Carrier Board SPI BIOS Flash.
SPI_MISO
A92
Data in to module from carrier board SPI BIOS flash.
SPI_MOSI
A95
Data out from module to carrier board SPI BIOS flash.
SPI_CLK
A94
Clock from module to carrier board SPI BIOS flash.
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.
BIOS_DIS0#
A34
Selection strap to determine the BIOS boot device.
BIOS_DIS1#
B88
Selection strap to determine the BIOS boot device.
Table 22
Miscellaneous Signal Descriptions
Signal
Pin # Description
I2C_CK
B33
General purpose I²C port clock output/input
I2C_DAT
B34
General purpose I²C port data I/O line
SPKR
B32
Output for audio enunciator, the "speaker" in PC-AT systems
WDT
B27
Output indicating that a watchdog time-out event has occurred.
FAN_PWMOUT
B101
Fan speed control. Uses the Pulse Width Modulation (PWM) technique to
control the fan's RPM.
FAN_TACHIN
B102
Fan tachometer input.
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.
Note
The congatec COM Express Type 6 and Type 10 modules use a Push-Pull output for the fan_pwm signal instead of the open drain output
specified in the COM Express specification. Although this does not comply with the COM Express specification 2.0, the benefits are obvious.
The Push-Pull output optimizes the power consumed by the fan_pwm signal without functional change.
Copyright © 2016 congatec AG
I/O
PU/PD
O 3.3VSB PU 10K
3.3VSB
I 3.3VSB
PD 100K
O 3.3VSB
O 3.3VSB
P 3.3VSB
I 3.3VSB
PU 10K
3.3VSB
I 3.3VSB
PU 10K
3.3VSB
I/O
PU/PD
I/OD 3.3V PU 2.2K 3.3VSB
I/OD 3.3V PU 2.2K 3.3VSB
O 3.3V
O 3.3V
O OD
PU 47K 3.3V
3.3V
I OD
PU 47K 3.3V
I 3.3V
PD 10K
TR33m10
Comment
Carrier shall pull to GND or left as
no-connect.
Carrier shall pull to GND or left as
no-connect
Comment
Signal is driven to logic 1 only.
External PD is required.
Requires a fan with two-pulse
output.
Trusted Platform Module chip is
optional (assembly option).
50/105
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