Storage Module and Method for Determining Whether to Back-Up a Previously-Written Lower Page of Data Before Writing an Upper Page of Data

摘要

A storage module and method are disclosed for determining whether to back-up a previously-written lower page of data before writing an upper page of data. In one embodiment, a storage module receives a command to write an upper page of data to memory cells that have already been programmed with a lower page of data. The storage module determines whether a command to protect the lower page of data was previously received. The storage module backs-up the lower page of data in another area of the memory before writing the upper page of data to the memory cells only if it is determined that the command to protect the lower page of data was previously received. The storage module then writes the upper page of data to the memory cells.

主权项

1. A method for determining whether to back-up a previously-written lower page of data before writing an upper page of data, the method comprising:
performing the following in a storage module having a memory with a plurality of memory cells:
receiving a command to write an upper page of data to memory cells that have already been written with a lower page of data;determining whether a command to protect the lower page of data was previously received;backing-up the lower page of data in another area of the memory before writing the upper page of data only if it is determined that a command to protect the lower page of data was previously received; andwriting the upper page of data to the memory cells.