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TPS3430: Internal timer start timing

Part Number: TPS3430

Dear Team,

TPS3430 datasheet has Figure 2. TPS3430 Window Watchdog Timing. When Late Fault situation occurs and /WDO is asserted (Logic Low), if next WDI pulse is inputted during this tRST (/WDO=Low) period, although WDI pulse is ignored during tRST, by which timing does internal timer of TPS3430 start to count tWDL & tWDU, WDI pulse falling edge, or /WDO rising edge?

Thank you.

Best Regards,

Koshi Ninomiya