Table 21 Spi Bios Flash Interface Signal Descriptions; Table 22 Miscellaneous Signal Descriptions - Congatec COM Express conga-TR3 User Manual

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