Smooth RTT transition

A method, comprising:

• receiving a plurality of control signals;
• converting the plurality of control signals to respective unary codes;
• selecting a control signal from the plurality of control signals and outputting a unary code of the control signal by using a plurality of selection devices, wherein the control signal corresponds to a termination resistance value;
• and
• adjusting one or more driver circuits based on the unary code to generate the termination resistance value, wherein the one or more driver circuits are connected to an I/O pin of an apparatus.

A termination resistance control circuit, comprising:

• a decoder configured to receive a plurality of control signals and convert the plurality of control signals to respective unary codes;
• a plurality of selection devices configured to select a particular control signal of the plurality of control signals based on a selection signal and output a unary code of the particular control signal, wherein the particular control signal corresponds to a particular termination resistance value;
• and
• an output driver of which a termination resistance is adjustable, wherein the output driver is configured to provide the particular termination resistance value based on the unary code.