[SOLVED] Writing to NAND Flash works correctly only after Erase. Is it a reality?

[brainiac_rus]

Hello!

I use in project FPGA and NAND Flash MT29F04G01
I developed spi core for this chip and try to read/write data from/to this Flash.
There is a cache register, in which data writing first, and then transmiting in NAND memory array.
In reading data transmiting from NAND memory array to cache register firstly.

I tryed to write and to read data from and to cache register. It works well.
Then i tryed to write data to nand memory array, but it works only after erase.
Is it standart behaviour of flash memory or there are some errors in my design?

 

[barry]

That's normal. An erased flash has all bits set to logic one; you program it by setting some bits to zero, but you can't change a zero back to a one.

 

[FvM]

Flash can be usually erased in pages. Refer to the datasheet.

 

[brainiac_rus]

Thank you!

There is nothing about it in datasheet

 

[FvM]

I don't know a flash type MT29F04G01 and can't find a datasheet for it.