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QTOPm14
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Table 29
Miscellaneous Signal Descriptions
Signal
Pin #
Description
I/O
PU/PD
Comment
WDTRIG#
70
Watchdog trigger signal. This signal restarts the watchdog timer of the Qseven
®
module on the falling edge of a low active pulse.
I 3.3V
PU 10k 3.3V
WDOUT
72
Watchdog event indicator. High active output used for signaling a missing
watchdog trigger. Will be deasserted by software, system reset or a system power
down.
O 3.3V
I2C_CLK
66
Clock line of I²C bus.
I/O 3.3V OD PU 4k99 3.3V
I2C_DAT
68
Data line of I²C bus.
I/O 3.3V OD PU 4k99 3.3V
SMB_CLK
60
Clock line of System Management Bus.
I/O 3.3VSB
OD
PU 10k
3.3VSB
SMB_DAT
62
Data line of System Management Bus.
I/O 3.3VSB
OD
PU 10k
3.3VSB
SMB_ALERT#
64
System Management Bus Alert input. This signal may be driven low by SMB devices
to signal an event on the SM Bus.
I/O 3.3VSB
OD
PU 10k 3.3V
SPKR
/GP_PWM_OUT2
194
Primary functionality is output for audio enunciator, the “speaker” in PC AT systems.
When not in use for this primary purpose it can be used as General Purpose PWM
Output.
O 3.3V
BIOS_DISABLE#
/BOOT_ALT#
41
Module BIOS disable input signal. Pull low to disable module’s on-board BIOS.
Allows off-module BIOS implementations. This signal can also be used to disable
standard boot firmware flash device and enable an alternative boot firmware source,
for example a bootloader.
I 3.3V
PU 10k 3.3V
