IEI Integration AFL-W10A-N270 v1.00 User Manual
Page 108
AFL-W10A-N270 User Manual
Page 108
NOTE:
The following discussion applies to DOS environment. IEI support is
contacted or the IEI website visited for specific drivers for more
sophisticated operating systems, e.g., Windows and Linux.
The Watchdog Timer is provided to ensure that standalone systems can always recover
from catastrophic conditions that cause the CPU to crash. This condition may have
occurred by external EMIs or a software bug. When the CPU stops working correctly,
Watchdog Timer either performs a hardware reset (cold boot) or a Non-Maskable Interrupt
(NMI) to bring the system back to a known state.
A BIOS function call (INT 15H) is used to control the Watchdog Timer.
INT 15H:
AH – 6FH Sub-function:
AL – 2:
Sets the Watchdog Timer’s period.
BL:
Time-out value (Its unit-second is dependent on the item “Watchdog
Timer unit select” in CMOS setup).
Table D-1: AH-6FH Sub-function
Call sub-function 2 to set the time-out period of Watchdog Timer first. If the time-out value
is not zero, the Watchdog Timer starts counting down. When the timer value reaches zero,
the system resets. To ensure that this reset condition does not occur, calling sub-function
2 must periodically refresh the Watchdog Timer. However, the watchdog timer is disabled
if the time-out value is set to zero.
A tolerance of at least 10% must be maintained to avoid unknown routines within the
operating system (DOS), such as disk I/O that can be very time-consuming.
- UPC-V312-D525 v1.02
- UPC-V312-D525 v1.10
- UPC-12A_GM45 v1.00
- UPC-12A_GM45 v2.00
- UPC-12A_GM45 v2.10
- UPC-V315-NM70
- UPC-V315-Screw Driver
- UPC-V315-QM77
- S12ASR v1.12
- S12ASR v3.00
- PPC-5xxx-9455 v1.00
- PPC-5xxx-9455 v1.10
- PPC-WIDS-51xxA-G41
- PPC-51xxA-H61
- PPC-5152-D525 v1.02
- PPC-5152-D525 v2.10
- PPC-37xxA-N26 v1.00
- PPC-37xxA-N26 v1.10
- PPC-37xx-N270 v1.01
- PPC-37xx-N270 v2.00
- PPC-37xx-N270 v2.11
- PPC-37xx-N270 v2.20
- ACT-457A
- AFL-4 series-N270 v1.05
- AFL-4 series-N270 v2.10
- AFL-4 series-N270 v2.11
- AFL-4 series-N270 v2.20
- AFL-W19A_W19B_17D_W15A-GM45 v2.10
- AFL-W19A_W19B_17D_W15A-GM45 v1.06
- AFL-W19A_W19B_17D_W15A-GM45 v2.20
- AFL-W15A_17D-GM45 v3.00
- AFL-15i-HM55 v1.01
- AFL-19i-HM55 v2.00
- AFL-15i-HM55 v1.20
- AFL-W19A_W19B_17D_W15A-N270 v1.06
- AFL-W19A_W19B_17D_W15A-N270 v2.20
- AFL-W19A_17D_W15A-N270 v3.00
- AFL-15A_15AE-N270_UMN_v1.01.pdf
- AFL-15A-N270 v1.03
- AFL-15A-N270 v2.10
- AFL-15A-N270 v2.20
- AFL-xxA-N26
- AFL-xxA-N270-Series v1.03
- AFL-xxA-N270-Series v2.00
- AFL-xxA-N270-Series v2.11
- AFL-xxA-N270-Series v2.20
- AFL-xxA-N270-Series v2.30
- AFL-W10A-N270 v2.13
- AFL-W10A-N270 v3.10
- AFL-W10A-N270 v3.20
- AFL-08AH-N270
- AFL-07A 08AH 10A 12A-LX Series
- AFL-LX-Series v2.01
- AFL-LX-Series v2.10
- AFL-F08A v2.10
- AFL-F08A v1.01
- AFL-F08A v2.21
- AFL-F08A v2.40
- AFL-08B-N270 v1.00
- AFL-08B-N270 v2.10
- AFL-08B-N270 v2.20
- AFL-08B-N270 v2.30
- AFL-057A-LX v1.02
- AFL-057A-LX v2.10
- AFL2-W21-H61
- AFL2-W19A-H61 v1.11
- AFL2-W19A-H61 v1.21
- AFL2-17A-H61 v1.02
- AFL2-17A-H61 v1.11
- AFL2-17A-H61 v1.23
- AFL2-W15B-H61
- AFL2-15A-H61
- AFL2-12A-HM65 v1.00
- AFL2-12A-HM65 v1.12
- AFL2-12A-D525
- AFL2-W15A-N270 v2.00
- AFL2-W15A-N270_W15A-L325 v1.01
- AFL2-W10A-N28
- AFL2-10A-N28
- AFL2-08A-N26
- AFL2-W07A-N26
- POC-17i_19i-Series_IEI
- IBS-19A
- Robot-TP-65M
- RPC-6022G
- RPC-6106_6108
- RPC-6010G
- EC-1040G
- LKM_Series
- IOVU-572M
- IOVU-752S
- IOVU-751R