Semiconductor device and a method for controlling accessing data

A semiconductor device comprising:

• a compression/expansion module for compressing or expanding data;
• a memory for storing the compressed data generated by the compression/expansion module;
• and
• a memory controller for controlling storage of data in the memory,
• wherein the compression/expansion module includes a compression information management unit for controlling writing or reading of the compressed data in the memory in units of a predetermined data size based on data for managing access to the memory,
• wherein the memory controller includes:
• a lossless compression unit for compressing data and outputting the compressed data and compression information;
• a lossless expansion processing unit for expanding the compressed data and outputting data before compression;
• and
• a management module for exclusively controlling access to the memory by the compression/expansion module in a defined data size unit, and
• wherein the compression information management unit permits writing to an area in the defined data size unit when the management module indicates that the area accessed by a write access is not exclusively owned by another compression/expansion module when the write access to the memory is performed, and permits reading to the area in the defined data size unit when the management module indicates that the area accessed by a read access is not exclusively owned by another compression/expansion module when the read access to the memory is performed.