Electronic device performing training on memory device by rank unit and training method thereof

A training method of an electronic device comprising a system-on-chip and a memory device, the method comprising:

• disabling a rank interleaving mode of the memory device;
• loading a training code to a first rank of the memory device;
• performing a first training operation on a second rank of the memory device by executing the training code loaded to the first rank;
• loading the training code to the second rank;
• performing a second training operation on the first rank by executing the training code loaded to the second rank:
• and
• storing results of performing the first and second training operations on the first and second ranks in a storage device,
• wherein the results of performing the first and second training operations comprise a first reference voltage for sampling output data of the first rank, and a second reference voltage for sampling output data of the second rank.

An electronic device, comprising:

• a memory device comprising a plurality of ranks, wherein the memory device is accessed based on a rank interleaving mode;
• and
• a system-on-chip that performs a training operation on the memory device, wherein the system-on-chip comprises:
• a plurality of reference voltage generators that generates a plurality of reference voltages for sampling output data of the plurality of ranks independently of each other.