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Flash-cells can be used as downcounters - ?

Hi,

I came across something as below while i was looking for downcounters. And this is really interesting !!

" Downwriting is possible in Flash Memory . Flash-Cells are proberly usable as downcounters. Start with bytewise "FF" and ure able to reprogram this flash-cell with every value that means not to bring a flash-data-BIT from "0" to "1". "

How is it possible to make the Flash memory to act like downcounters ?

I am using S29GL512N MirrorBit=E2=84=A2 Flash. (Spansion Flash).

Share your views/ideas .

Thx in advans, Karthik Balaguru

Reply to
karthikbg
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You can sort of count down FF, 7F, 3F, 1F, 0F, 07, 03, 01, 00

Those particular Spansion Flashes can be reprogrammed on a word (not byte) basis. Some other Spansion series have significant limitations on the number of times you can reprogram bytes or words and indeed which combinations of bytes/words can be reprogrammed "Programming to the same word address multiple times without intervening erases (incremental bit programming) requires a modified programming method. For such application requirements, please contact your local Spansion representative."

You must not even try to write a 0 bit back to a 1 bit, always rewrite the 0 to 0, otherwise you will get errors due to the illegal operation. These errors may cut the operation short before the programming of the desired 0 is fully complete.

Remember Flash is an analog device.

Cheers, Alf

Reply to
Alf Katz

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