ADLINK Technology CoreModule 730, Справочное руководство

Страница: 29 / 36

Chapter 3 Hardware
CoreModule 730 Reference Manual 25
Ethernet External LED
This header provides signals for an external LED that indicates Ethernet links and activity using a single row
of 4 pins with 0.049" (1.25mm) pitch.
Note: The shaded area denotes power or ground.
Watchdog Timer
The watchdog timer (WDT) restarts the system if an error or mishap occurs, allowing the system to recover
from the mishap, even though the error condition may still exist. Possible problems include failure to boot
properly, loss of control by the application software, failure of an interface device, 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 OS fails to boot in the time interval set in the BIOS, the system will
reset.
Enable the
Watchdog Timer (sec) field in the BIOS and Hardware Settings screen 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 (reset) the
WDT before the timer expires. This can be done by accessing the hardware directly or through a BIOS
call.
•
During System Operation – An application can set up the WDT hardware through a BIOS call, or by
accessing the hardware directly. ADLINK Board Support Packages provide APIs to the WDT. The
application must tickle (reset) the WDT before the timer expires or the system will be reset.
•
Watchdog Code examples – ADLINK has provided source code examples on the CoreModule 730
Support Software QuickDrive illustrating how to control the WDT. The code examples can be easily
copied to your development environment to compile and test the examples, or make any desired
changes before compiling. Refer to the WDT Readme file in the Sample Code directory on the
CoreModule 730 Support Software QuickDrive.
Power Interface
The CoreModule 730 requires one +5 volt DC power source and uses a 10-pin header with odd/even (1, 2)
pin sequence and 0.10" (2.54mm) pitch. If the +5VDC power drops below ~4.65V, a low voltage reset is
triggered, resetting the system.
The power input header (J23) supplies the following voltages and ground directly to the module:
•
5.0VDC +/- 5%
Table 3-13. Ethernet External LED Pin Signals (J26)
Pin # Signal Description
1 V3.3_CONN +3 volts – Pr3 volts to external LED (Pins 1-2 for Green
LED)
2 ETH_ACT_LED Ethernet Activity
3 ETH_LINK100_LED Fast Ethernet Link with +3 volts power (Pins 3-4 for Bi-Color
LED)
4 ETH_LINK1000_LED Gigabit Ethernet Link
Table 3-14. Power Interface Pin/Signals (J23)
Pin Signal Descriptions
1 GND Ground
2 +5V +5 Volts
3 Key/GND Key Pin on connector/Grounded on board