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23.09.2023 - tech support stopped
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Сергей



Joined: 26 Aug 2005
Posts: 20280

Flash-Extractor developer

PostPosted: Wed Jul 12, 2023 16:14    Post subject: About Micron v2 RR
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Many times i get situation when i found RR, check with Test Read all is fine, many green sectors

Then reread with NR
And get red ECC map

This happen when second byte of RR = 3
Full RR = xx 03

If you meet this situation look on find RR log, and select RR where second byte is not 3
Try 0, 1 and 2

If somebody make tests with their chips, please tell me about results
May be better remove tests for "3" from library
Bolo



Joined: 05 Dec 2017
Posts: 727
Location: 506F6C616E64

PostPosted: Wed Jul 12, 2023 16:45    Post subject:
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it's becouse Second value register of micron have only 4 values - 00b, 01b, 10b, 11b

Attached settings

I think better keep it for future research
Micron_v2_explanation.PNG
Сергей



Joined: 26 Aug 2005
Posts: 20280

Flash-Extractor developer

PostPosted: Wed Jul 12, 2023 20:27    Post subject:
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I thnk Persistence must be always Off

Beause it change RR values in chip memory

And if you find good values in middle of ECC map
Then when you read chip from begin, chip will change values in its memory

Thats why i ask make tests
jeremyb



Joined: 09 Dec 2008
Posts: 1949
Location: RecoverMyFlashDrive.com Bridgeport, CT, USA

PostPosted: Thu Jul 13, 2023 4:38    Post subject:
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I've noticed when crossing the pSLC boundary with v2 into TLC/QLC land the dump will go red. If you skip over pSLC land the dump will be green, with persistence enabled highly recommended for TLC/QLC quality. You can usually spot the pSLC boundary by the extra blocks in the ONFI data.. eg: Total Blocks = 0x880, 0x80 = pSLC land, 0x800 = TLC/QLC land.

I don't think v2 is meant for pSLC land, persistence from pSLC to QLC is like scrambling your brain.. ie: block 1.2.3.4... 80.81.82, it should start at 80
eg: Help.. Help... my pSLC persistence doesn't fit my QLC persistence..

I think this is what you're seeing... Thx for taking the time to ask.. I thought I was the only one who pondered such questions.. Smile
Сергей



Joined: 26 Aug 2005
Posts: 20280

Flash-Extractor developer

PostPosted: Thu Jul 13, 2023 12:53    Post subject:
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jeremyb wrote:
I've noticed when crossing the pSLC boundary with v2 into TLC/QLC land the dump will go red


This is what i want to say, but do not found good english words

Also possible that it happen on places wiith FF or Zeros
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