Artesyn MITX-CORE-820 Installation and Use (July 2014) - Manual (Page 71)

Functional Description
MITX-CORE-820 Installation and Use (6806800M10H) 71
This function is optional as per user’s request.
4.16 Watchdog Timer
The MITX-CORE-820 implements a two-stage watchdog timer (WDT), such as the one
integrated with PCH, with a programmable timeout (one second to ten minutes minimum)
and the ability for software to enable and disable. The BIOS disables the device at boot, and the
software will re-enable when watchdog application loads. Stage-1 timeout event causes an
interrupt and Stage-2 timeout event causes a reset. WDT is disabled before entering S3 state,
and re-enabled upon exiting S3.
4.17 RTC Circuit
There is an on-board battery holder for a BR2032 or an equivalent battery. This battery holder
allows for quick and easy replacement of a 3 V button cell lithium battery which provides back-
up power to the on-board RTC.
4.17.1 Boot Block
The SPI flash supports the boot block section which contains the code to boot to a minimum
DOS. Once the board boots to a minimum DOS, the software program to reflash, the SPI flash
can be run from the DOS command prompt. The boot block will be completely protected.
Table 4-20 S/PDIF Out Header (P30)
Pin Signal
1 +V5S
2 SPDIF_OUT_HDMI
3 GND
Table 4-21 Clear CMOS Header (P4)
Pin Signal Pin Signal
1 NC 2 RTC_RST#
3 GND