NAND flash read and write

Charan,

You can always write data to a NAND page without erasing the block. But it makes sense only when the page is already erased. Otherwise it will corrupt the current data already there on the page. 

Hi Renjith Thomas, 

                                I agree with your answer, i have one more doubt first i'll erase the block then i'll write a page into the NAND, whether is it possible to update that page without erasing the block. If possible, please let me know.

Thanks & Regards,

Guru Charan

Charan,

Its not possible to write the page without corrupting the current data. If the data is 0xFF then it mostly will not corrupt the data. The logic of NAND is very easy to understand. When you erase all bits are made 1 and when you write some valid data, wherever zeros are there, it will flip the particular bit. Since its not able to reverse 0 to 1 without erasing it, if you are writing data other than 0xFF mostly it will end up corrupting the present data.