Compression device, compression and decompression device, and memory system

A memory system comprising:

• a non-volatile memory;
• and
• a memory controller including a compression device, the compression device including:
• an analyzer circuit configured to analyze first data that is input thereto, determine an estimated power consumption in compressing and/or decompressing with respect to each of a sequence of the first data, and generate one or more parameter values regarding data compression and/or decompression, the one or more parameter values including a first parameter value, which is a cumulative value of the estimated power consumption in compressing and/or decompressing with respect to the sequence of the first data;
• a control circuit configured to generate at least one compression mode information indicating whether or not compression is to be performed, based on the one or more parameter values;
• a compressor circuit configured to compress the first data into second data according to the compression mode information;
• and
• a selector circuit configured to output write data including the first data if not compressed or the second data if the first data is compressed, together with the compression mode information,
• wherein the memory controller stores the write data.