Chapter 3
Hardware
34
Reference Manual
ReadyBoard 910
Watchdog Timer
The Watchdog Timer (WDT) restarts the system if a mishap occurs. Possible problems include failure to
boot properly, the application software’s loss of control, unexpected conditions on the bus, or other
hardware or software malfunctions.
The WDT (Watchdog Timer) can be used both during the boot process and during normal system operation.
•
During the Boot process – If the operating system fails to boot in the time interval set in the BIOS, the
system will reset.
Enable the WDT in the Boot Settings of BIOS Setup. Set the WDT for a time-out interval in seconds,
between 1 and 255, in one second increments. Ensure you allow enough time for the operating system
(OS) to boot. The OS or application must tickle the WDT before the timer expires.
•
During System Operation – An application can set up the WDT hardware through a BIOS call, or by
accessing the hardware directly. Some ADLINK Board Support Packages provide an API interface to
the WDT. The application must tickle the WDT before the timer expires or the system will be reset. The
BIOS implements interrupt 15 function 0C3h to manipulate the WDT.
Power Interfaces
The ReadyBoard 910 uses various voltages onboard and externally re12 volts through the external
Power In (CN3) interface, which uses an 8-pin header with 0.165" (4.2 mm) pitch. The +12V is provided for
the CPU Fan, System Fan, LVDS power, PCI-104 bus, and PCIe Mini Card power. All other onboard
voltage requirements, including the CPU core voltages are met with +5 volts DC +/- 5%, derived from the
externally su12 volts.
Power In
lists the pin signals for Power In header (CN3), which provides 8 pins in two rows with
consecutive (1,6) pin sequence and 0.165" (4.2mm) pitch.
Note:
The shaded table cells denote power or ground.
Table 3-17. Power In Pin Signal Descriptions (CN3)
Pin #
Signal
Description
1
GND
Ground
2
GND
Ground
3
GND
Ground
4
GND
Ground
5
+12V
This +12 voltage is primarily for the PCI-104 bus, PCIe Mini Card, CPU fan,
System fan, and LVDS power (may also be backlight power).
6
+12V
This +12 voltage is primarily for the PCI-104 bus, PCIe Mini Card, CPU fan,
System fan, and LVDS power (may also be backlight power).
7
+12V
This +12 voltage is primarily for the PCI-104 bus, PCIe Mini Card, CPU fan,
System fan, and LVDS power (may also be backlight power).
8
+12V
This +12 voltage is primarily for the PCI-104 bus, PCIe Mini Card, CPU fan,
System fan, and LVDS power (may also be backlight power).
