STM32H753 FLASH ECC Question. Always enabled?

[Jamie Bayley]

Hey there everyone.

I'm currently writing a bootloader for an STM32 device. The ECC functions on the flash controller are important to us, but the datasheet doesn't show whether it has to be enabled or not. And I cannot find any registers with an enable bit for the ECC on the FLASH. My assumption is that this ECC is always on?

Which is in contrast to the ECC on the RAM which has to be enabled in software.

Could anybody with any deeper knowledge clarify for me please? Cheers 🙂

[TDK]

The reference manual will provide more complete information on the technical details of the chip. I’m pretty sure it is permanently enabled.

[SofLit]

Dear @Jamie Bayley​ ,

Yes internal Flash ECC is always enabled. No way to disable it.

RAM ECC is enabled by SW.

Also there is the AN5342 " Error correction code (ECC) management for internal memories protection on STM32H7 Series" if you are interested by ECC subject.

SofLit

[Tesla DeLorean]

Strikes me as an integral part of the array, both to ensure viability, and provide high die yield.

Pretty sure ST doesn't have spare line remapping, so each line had better work, especially on an array that's 16mbit

[Jamie Bayley]

Thanks SofLit. That's really helped.

I'll have a look closer at the document you provided, as ECC is very important for our use case.

[SofLit]

Thank you for the feedback.

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SofLit