Non-volatile semiconductor memory device with writing sequence enabling early-stage judgement of writing

摘要

In the data writing sequence, judgement of writing is divided into two stages of judgement 1 and judgement 2. In the judgement 1, it is determined whether the data writing has been completed for at least one of a plurality of memory cells, and in the judgement 2, it is determined whether the data writing has been completed for all the memory cells. Changing the writing conditions for the judgements 1 and 2 enables judgement of the data writing in an early stage.