Toshiba C3PU35 User Manual

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5.2 Hardware Processing RAS Functions6F8C1118 3755.2 Hardware Processing RAS Functions5.2.1 WDT Circuit and Hardware ResetThe WDT circuit issues an NMI to the main unit when the WDT counter is not reset within acertain interval (WDT monitoring interval). The WDT monitoring interval can be set up to500ms x 255 (approximately 2 minutes) in 500ms units.If an NMI is not accepted within 500ms after a WDT timeout NMI is issued, the system isreset by the hardware reset function.Force reset because NMI (WDT) reset is not performed by CPUWDT resetNMIrequestForce resetoutput500ms*N500ms*N 500ms(recover because resetwithin 500ms)NMI issuedImportant• Do not enable the suspend function when using the WDT function. This may cause amal-function.The suspend function is a power saving method and cannot be used together withthe WDT function.5.2.2 RAS MemoryRAS memory is a 64K-byte battery backed non-volatile memory and is used to store NMIevents and RAS information. It is also used by the RAS support software to save shutdowninformation.RAS memory is designed to be accessed using the I/O space and does not use anymemory space.RAS memory is backed up by the backup battery (Lithium battery) installed inside the mainunit.5.2.3 Interrupt SignalsInterrupts detected by RAS board and sent to CPU are classified into NMI events and MIevents.• Examples of NMI events are: WDT timeout, events requiring immediate action such aspower failure, system shutdown, and remote input for power control.• An example of MI event is fan stop.