topic Re: FS85xx: Behaviour when trying to close INIT_FS with a wrong WD in Power Management

FS85xx: Behaviour when trying to close INIT_FS with a wrong WD

AndreasStolze — Fri, 05 Apr 2024 10:14:02 GMT

Hi all,

quick question: What happens, if the challenger WD is used, and a bad WD is sent during trying to close the FS_INIT?

There's the WD_ERR_LIMIT, but is it also applied here?

Currently we're seeing a direct assertion of the RSTB pin but want this to be confirmed.

Also regarding debug mode:

Would be behaviour here be identical? Also a instant reset when the wrong WD is sent?

Thank you
Andreas

Re: FS85xx: Behaviour when trying to close INIT_FS with a wrong WD

TomasVaverka — Fri, 05 Apr 2024 13:02:57 GMT

Hi Andreas,

Yes, if there is no WD refresh or a bad WD refresh is sent during the INIT_FS phase, RSTB pulse is generated, the fault error counter is incremented by 1 and a new initialization phase is automatically started when RSTB is released.

No, in Debug mode, the INIT_FS window is infinite and the WD window is fully opened meaning WD errors are not taken into account.

BR, Tomas

Re: FS85xx: Behaviour when trying to close INIT_FS with a wrong WD

AndreasStolze — Fri, 05 Apr 2024 13:06:39 GMT

Thanks! Quick question, quick answer!