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Advanced LAN Bypass User Manual
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11 Advanced LAN Bypass User ManualChapter 2 OVERVIEW Arm and enable (non-volatile setting)Toggle pin mode will be automatically enabled and the WDT will be armed bydefault (i.e., upon FW start-up)2.5.3 Global Watchdog Trigger MechanismAdvanced LAN Bypass supports global synchronization between multiple bypasssegments through a hardware signal. In this mode, a master segment may activatethe trigger signal and the other LAN Bypass MCUs will receive the signal as slaves.Reception of the trigger signal will cause the external trigger event if the segment isconfigured as a slave. In this case, the master as well as the slave LAN BypassMCUs will perform the defined action for the external trigger event.Either one single or multiple masters can assert the global WDT trigger signal.Any LAN Bypass MCU can be configured to be a master or slave or to ignore theglobal WDT trigger signal via dedicated Advanced LAN Bypass SW API commands.Certain Advantech hardware platforms also support other masters such as the Base-board Management Controller (BMC) or the x86 chipset (PCH). Please refer to therelated hardware platform documentation for details.Two modes are supported for triggering the event: edge trigger and level trigger.In edge trigger mode, a falling edge of the hardware signal will trigger an externaltrigger event. The bypass segment will be switched to the corresponding state asdefined by the external trigger event action and remain in this state until anotherevent occurs or until a manual action is received via an API.In level trigger mode, a low-level hardware signal will trigger an external triggerevent. The bypass segment will be switched to the corresponding state as defined bythe external trigger event action, and it will remain in this state as long as the hard-ware signal stays asserted. Other events will be ignored as long as the global WDTtrigger signal remains at a low level. When the hardware signal de-asserts (goeshigh), the bypass segment will return to the previous state that was active beforeassertion of the signal.Global WDT trigger mode summary: DisabledGlobal WDT trigger is not enabled Enable, slave mode, edge triggerGlobal WDT trigger is enabled in slave mode and uses edge trigger Enable, slave mode, level triggerGlobal WDT trigger is enabled in slave mode and uses level trigger Enable, master mode, edge triggerGlobal WDT trigger is enabled in master mode and uses edge trigger Enable, Master mode, Level triggerGlobal WDT trigger is enabled in master mode and uses level triggerNote: all settings for the global WDT trigger are non-volatile and will be preservedacross power cycles or in the event of power failure.Examples: Segment 1 is configured as a master and Segments 2 and 3 are configured asslaves.– When the Segment 1 WDT expires, it will trigger an external trigger event onSegments 2 and 3.– Segment 1 will perform the action defined for the WDT timeout event, whileSegments 2 and 3 will perform the action defined for the external triggerevent. |
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