detect and manage power cut on MLC NAND

[Qi Wang 王起 (qiwang)]

Hi Boris, Richard

On Fri, 20 Mar 2015 05:08 PM +0000 Richard Weinberger wrote:
>
>Am 20.03.2015 um 09:58 schrieb Boris Brezillon:
>> Hi Qi,
>>
>> On Fri, 20 Mar 2015 07:44:58 +0000
>> Qi Wang 王起 (qiwang) <qiwang at micron.com> wrote:
>>
>>>>
>>>> I seem to remember a requirement to write pages to a block in a
>>>> monotonic fashion (low to high). Is that still the case? It
>>>> seems that the low page backup could violate that rule otherwise.
>>>
>>> Yes, pages need to be programmed from low to high. But it is possible
>>> to skip some pages. Take a example,
>>>
>>> below page program ordering is ok.
>>> Page 0, page 1, page 2, page 4, page 6, page 10, page 15, etc..
>>> Just make sure don't turn back to program the low page is ok.
>>
>> I asked a question regarding the programming sequence in answer to Iwo,
>> but I'm not sure you were in Cc, so I'm asking it again.
>>
>> Say page 1 is paired with page 4, can we program pages in this order:
>> 1, 4, 2, 5, 3, 6, ..., so that both paired pages are programmed
>> together (the Jumbo page approach Iwo described in his mail).
>
>That's a good question. I was always told that you're not allowed
>to program pages in a non-linear manner.
>

Yes, you are right. This method isn't allowed. User can only program page
within a block from low address to high address.

--
Qi Wang
Thanks