Communication interface circuit supporting communication link change and method of operating same

A communication interface circuit comprising:

• a physical layer circuit configured to generate a plurality of differential signals based on driving voltages of each of a plurality of three-phase wire links of a data lane and output a symbol based on the plurality of differential signals;
• and
• a protocol layer circuit configured to de-map the symbol and output data,
• wherein the physical layer circuit includes a decoder that is configured to calculate the symbol based on a reception differential signal based on the plurality of differential signals, a preceding differential signal based on the plurality of differential signals in a previous unit interval, and a control code, and
• wherein the control code is configured to instruct a decoding change based on a coupling relationship of the plurality of three-phase wire links.

A method of operating a communication interface circuit, the method comprising:

• generating packet data based on input data;
• encoding the packet data to output a transmission state;
• and
• driving a data lane based on the transmission state, the data lane including a plurality of three-phase wire links,
• wherein the encoding of the packet data includes calculating the transmission state based on a preceding state output in a previous unit interval, a symbol mapped to the packet data, and a control code, and
• the control code instructs an encoding change based on a coupling relationship of the plurality of three-phase wire links.