COMe-cEL6 - User Guide, Rev.1.3
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COMe Signal
Pin
Description
Reset Button
(SYS_RESET#)
B49
When the “SYS_RESET# “ pin is detected active (falling edge triggered), it allows
the processor to perform a “graceful” reset, by waiting up to 25 ms for the SMBus
to enter the idle state before forcing a reset, even though activity is still occurring.
Once reset is asserted, it remains asserted for 5 ms to 6 ms regardless of
whether the SYS_RESET# input remains asserted or not.
Carrier Board
Reset(CB_Reset#)
B50
When the “CB_Reset” from module to carrier is active low, the module outputs a
request to the carrier board to reset.
SM-Bus Alert
(SMB_ALERT#)
B15
When an external battery manager is present and SMB_ALERT # connected, the
module always powers on even if the BIOS switch “After Power Fail” is set to “Stay
Off”.
Battery low
(BATLOW#)
A27
BATLOW# Indicates that the external battery is low and provides a battery-low
signal to the module for orderly transitioning to power saving or power cut-off
ACPI modes.
Wake Up Signal
WAKE[0:1]
B66/
B67
Indicates PCIe wake up signal “Wake 0” or general purpose wake up signal
“Wake 1”
Suspend Control
(SUS_STAT# )
B18
SUS_STAT# indicates an imminent suspend operation. Used to notify LPC devices.
After a complete power loss (including battery voltage), there is an additional cold reset.
This additional reset will not happen on any subsequent warm or cold reboots.
2.4.3.
Power Supply Modes
The COMe-cEL6 supports single power supply mode and ATX power supply mode. To change the power supply mode
set the ATX and single power supply controls as described in the following sections.
2.4.3.1.
ATX Power Supply Mode
To start the module in ATX mode, connect VCC and 5V Standby from a ATX PSU. As soon as the standby rail ramped up
the PCH enters S5 state and starts the transition to S0. SUS_S3# (usually connected to PSU PS_ON#) turns on the
main power rail (VCC). As soon as the PSU indicates that the power supply is stable (PWR_OK high) the PCH continues
transition to S0. The input voltage must always be higher than 5V standby (VCC>5VSB) for modules supporting a wide
input voltage range down to 8.5V.
The input voltage must always be higher than 5 V standby (VCC>5VSB) for modules
supporting a wide input voltage range down to 8.5 V.
Table 8: ATX Mode Settings
State
PWRBTN#
PWR_OK
V5_Standby
PS_ON#
VCC
G3
x
[1]
x
[1]
0V
x
[1]
0V
S5
high
low
5V
high
0V
S5
→
S0
PWRBTN Event
low
→
high
5V
high
→
0V
→
VCC
S0
high
high
5V
low
VCC
[1]
Defines that there is no difference if connected or open.
