Memory system

A method for writing data in a memory device including a first memory unit and a second memory unit, the method comprising:

• calculating first redundant data based on first write data;
• writing the first write data and the first redundant data in the first memory unit through a plurality of writing steps, in each of which a part of the first write data or a part of the first redundant data is written;
• starting calculation of second redundant data based on second write data after all of the writing steps for writing the first write data and the first redundant data have been carried out;
• and
• writing the second write data and the second redundant data in the second memory unit through a plurality of writing steps, in each of which a part of the second write data or a part of the second redundant data is written,
• wherein at least one of the writing steps for writing the second write data and the second redundant data is carried out before all of the writing steps for writing the first write data and the first redundant data have been carried out.

A memory device comprising:

• a memory unit including a plurality of memory blocks, each of which includes a first line group and a second line group, data being written in memory cells connected to each line of the first and second line groups,
• a code encoding unit configured to calculate first redundant data based on first write data and second redundant data based on second write data;
• and
• a control unit configured to cause the first write data and the first redundant data to be written in the memory cells along each line of the first line groups with respect to each of the memory blocks in parallel and the second write data and the second redundant data to be written in the memory cells along each line of the second line groups with respect to each of the memory blocks in parallel,
• wherein the first and second write data and the first and second redundant data are written through a plurality of writing steps with respect to each line of the first and second line groups, in each of which a part of data is written, at least one of the writing steps for writing the second write data and the second redundant data being carried out before all of the writing steps for writing the first write data and the first redundant data have been carried out, and
• wherein the control unit is configured to control the code encoding unit to start calculation of the second redundant data after all of the writing steps for writing the first write data and the first redundant data have been carried out.