Apparatus and method for training device-to-device physical interface

A method of training a physical interface between a first device and a second device, the method comprising:

• performing a first training of the physical interface by communicating with the second device by using a first candidate group of lanes from among a plurality of lanes;
• performing a second training of the physical interface by communicating with the second device by using a second candidate group of lanes from among the plurality of lanes, the second candidate group being different from the first candidate group;
• determining a lane group based on a result of the first training and a result of the second training;
• and
• setting the second device so that the determined lane group is used for the physical interface,
• wherein the physical interface includes a high bandwidth memory (HBM) interface, and the second device includes a plurality of memory dies that are stacked.

A first device configured to communicate with a second device based on a physical interface, the first device comprising:

• a routing circuit configured to select some of a plurality of lanes based on a control signal, for the physical interface;
• and
• processing circuitry configured to,
• generate the control signal for training the physical interface by using each of different candidate groups of lanes from among the plurality of lanes, and
• determine a lane group to be used for the physical interface based on a result of the training
• wherein the physical interface includes a high bandwidth memory (HBM) interface, and the second device includes a plurality of memory dies that are stacked.

A system comprising:

• a plurality of interconnections;
• and
• a first device and a second device configured to communicate with each other via at least some of the plurality of interconnections based on a physical interface,
• wherein the first device and the second device are further configured to train the physical interface by using each of a plurality of different candidate groups, each candidate group including interconnections from among the plurality of interconnections,
• wherein first device is configured to determine an interconnection group to be used for the physical interface based on training results,
• wherein the physical interface includes a high bandwidth memory (HBM) interface,
• wherein the second device includes a plurality of memory dies that are stacked, and
• wherein the plurality of interconnections include at least one through silicon via penetrating at least one of the plurality of memory dies.