LayerscapeのトピックRe: can nand controller ECC has the ability to correct bit-flip in OOB area?

can nand controller ECC has the ability to correct bit-flip in OOB area?

luckyluo — Thu, 24 Jan 2019 08:22:41 GMT

Dear NXP,

I am using LS1088A in my product, I am sure that the nand controller ECC can fix the bit-flip in data area, but can nand controller ECC has the ability to correct bit-flip in OOB area? e.g if there is one bit-flip in OOB ecc position, this means the ecc content in OOB is wrong in one bit, so what will ECC do? can it detect this bit-flip and fix it?

Thanks a lot

Lucky Luo

Re: can nand controller ECC has the ability to correct bit-flip in OOB area?

yipingwang — Fri, 01 Feb 2019 08:31:03 GMT

Hello Lucky Luo ,

The IFC computes the ECC only for the main region data (as the ECC is not computed for the spare region).

The decoder detects and corrects 4/8 bits of error on the main region data and the corresponding ECC bytes stored.

Have a great day,
TIC

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Re: can nand controller ECC has the ability to correct bit-flip in OOB area?

luckyluo — Mon, 11 Feb 2019 03:18:43 GMT

So both main region data and the corresponding ECC bytes stored in OOB are ecc-protected, that's good for me.

thank you so much for your explanation.