Memory systems including memory controllers and memory modules and methods of processing data in the memory systems

A method performed by a memory system for processing data, the method comprising:

• receiving, by a media error correction code (ECC) decoder of the memory system, encoded read data read from stored memory data stored in a memory medium of the memory system;
• decoding, by the media ECC decoder, the encoded read data when the encoded read data is not poison data and a number of erroneous bits for the encoded read data is less than or equal to a threshold value;
• and
• skipping decoding, by the media ECC decoder, the encoded read data when the encoded read data is poison data and the number of erroneous bits for the encoded read data is less than or equal to the threshold value.

A memory system comprising:

• a memory controller coupled between a host and a memory module, wherein the memory controller is configured to control an operation of the memory module;
• and
• the memory module including a memory medium and a module controller, wherein the module controller comprises:
• a media error correction code (ECC) encoder configured to generate media ECC encoded data including write poison data comprised of a plurality of poison bits from first channel ECC encoded data generated by the memory controller and configured to transmit the media ECC encoded data to the memory medium;
• a poison decoder configured to analyze read poison data included in read data outputted from the memory medium and configured to discriminate whether the read poison data is identical to the write poison data to generate a control signal;
• and
• a media ECC decoder configured to perform or skip a media ECC decoding operation of the read data according to the control signal outputted from the poison decoder.