Device for performing communication and computing system including the same

A device for performing communication between components in a computing system, comprising:

• an upstream port structured to receive data from or transmit data to one or more external devices located on an upstream path through a link including a plurality of lanes structured to include differential signaling pairs for receiving and transmitting data;
• a margining lane control register configured to store information associated with a margin command for requesting a lane margining operation to acquire margin status information to indicate a margin of each of the plurality of lanes;
• a margining lane status register configured to store the margin status information;
• a lane margining controller coupled to the upstream port and configured to record the information associated with the margin command in the margining lane control register, control the upstream port to transmit the margin command recorded in the margining lane control register to the one or more external devices, control the upstream port to receive the margin status information from the external devices, and record the margin status information received through the upstream port in the margining lane status register;
• and
• a port setting controller configured to receive the margin status information from the margining lane status register and coupled to be in communication with the upstream port to determine a setting of the upstream port based on the margin status information.