Virtualization Technology (Intel ® Vt); Watchdog Timer (Wdt) - Dual Stage; Wdt Signal; Table 20: Dual Stage Watchdog Timer- Time-Out Events - Kontron COMe-cDV7 User Manual

9.15. Virtualization Technology (Intel ® VT)
Intel® Virtualization Technology (Intel® VT) is a portfolio of technologies that enables one hardware platform to
function as multiple virtual platforms. Virtual technology reduces overhead, improves manageability by limiting
downtime, improves productivity by partitioning separate computer activities and improves security in virtual
environments.
The supported Intel® VT:
 Intel® Virtualization Technology (VT-x) – enables multiple "virtual" platforms.
 Intel® Virtualization Technology for Directed I/O (VT-d) - enables I/O-device virtualization
 Intel® VT-x with Extended Page Tables (EPT)- improves memory intensive virtualized applications with hardware
optimization of page table management, (also known as Second Level Address Translation (SLAT)
9.16. Watchdog Timer (WDT) – Dual Stage
A WatchDog Timer (WDT) or computer operating properly (COP) timer is a computer hardware or software timer. If
there is a fault condition in the main program, the watchdog triggers a system reset or other corrective actions. The
intention is to bring the system back from the non-responsive state to normal operation.
Possible fault conditions are a hang, or neglecting to service the watchdog regularly. Such as writing a "service pulse" to
it, also referred to as "kicking the dog", "petting the dog", "feeding the watchdog" or "triggering the watchdog".
The dual stage watchdog timer works with two stages that can be programmed independently and used stage by stage.

Table 20: Dual Stage Watchdog Timer- Time-out Events

0000b No action
0001b Reset
0010b NMI
0011b SMI
0100b SCI
0101b Delay -> No
action*
1000b WDT Only

9.16.1. WDT Signal

Watchdog time-out event (pin B27) on the COM Express® connector supports a signal that can be asserted when a
watchdog timer has not been triggered within a set time. The WDT signal is configurable to either of the two stages.
After reset, the signal is automatically deasserted. If deassertion is necessary during runtime, contact Kontron Support
for further help.
www.kontron.com
The stage is off and will be skipped.
A reset restarts the module and starts a new POST and operating system.
A non-maskable interrupt (NMI) is a computer processor interrupt that cannot be
ignored by standard interrupt masking techniques in the system. NMI is used typically
to signal attention for non-recoverable hardware errors.
A system management interrupt (SMI) makes the processor entering the system
management mode (SMM). As such, specific BIOS code handles the interrupt. The
current BIOS handler for the watchdog SMI currently does nothing. For special
requirements, contact Kontron Support.
A system control interrupt (SCI) is a OS visible interrupt to be handled by the OS using
AML code.
Might be necessary when an operating system must be started and the time for the
first trigger pulse must be extended. Only available in the first stage.
This triggers the WDT pin on the carrier board connector (COM Express® pin B27) only
COMe-cDV7 - User Guide, Rev 1.0
// 46