Kontron SMARC-sA3874i - Manual (Page 67)

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User’s Guide
5 ULP-COM sA3874i Special Features
5.1 Watchdog Timer
The ULP-COM sA3874i module implements a Watchdog Timer (WDT) based on the TI Cortex A8 implementation
with a 32b counter. The WDT is made available through the standard Linux Watchdog API.
A description of the API is available following the link below:
http://www.kernel.org/doc/Documentation/watchdog/watchdog-api.txt
5.2 PMU GPIO
The PMU on the ULP-COM sA3874i contains a few GPIOs. These GPIOs are used for power management
functionality but can also be used for general purpose I/O. These GPIOs are different from ULP-COM sA3874i
module hardware specification GPIOs.
The table below shows the PMU GPIO usage information details:
TI PMU TPS659110C
ULP-COM sA3874i Edge
finger
Net name Notes
Pin # Pin Name
Pin
#
Pin Name
F1 SLEEP S149 SLEEP# SLEEP#/PMU_SLEEP
Sleep indication from carrier
board
L3 INT1 PMU_INT1 PMU Interrupt signal
N1 PWRHOLD Not used
N2 PWRDN THERM High Temp warning signal
L6 HDRST P127 RESET_IN#
RESET_IN#/
SYS_RESET_IN#
Reset input to the PMU
through level translator
E4 PWRON P128 POWER_BTN# POWER_BTN
Power button input from
carrier board
H4 NRESPWRON PMU_NRESPWRON PMU reset out signal
C7 NRESPWRON2 Not used
L5 GPIO0 EN_V_1V5_DDR3
V_1V5_DDR3 Power regulator
enable signal