Memory retention upon reset

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Memory retention upon reset

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kashif_sagheer
Contributor II

I have a couple of questions regarding the standby RAM and DTCM memory retention features during reset events:


Are external resets considered destructive resets?

Under which reset types do standby RAM and DTCM memory retain their data?

If external resets are considered functional then upon using external watchdog reseton my Bose custom board, the standby RAM does not retain data. and why are the external reset sources included in the FES function/external register?

#s32K3

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Senlent
NXP TechSupport
NXP TechSupport

Hi@kashif_sagheer

1.Are external resets considered destructive resets?

Yes, MC_RGM manages the external reset coming from RESET_B. The detection of a falling edge on RESET_B starts the reset sequence from the beginning of the destructive reset entry sequence.

 

2.Under which reset types do standby RAM and DTCM memory retain their data?

A functional reset indicates that an event has occurred after which it can be guaranteed that critical register and memory content is still intact.

 

3.If external resets are considered functional then upon using external watchdog reseton my Bose custom board, the standby RAM does not retain data. and why are the external reset sources included in the FES function/external register?

No, external reset is a destructive reset, refer to first reply.

A destructive reset indicates that an event has occurred after which critical register or memory content can no longer be guaranteed.

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