Abstract: Described is an apparatus which comprises: a switching device to receive first and second inputs, and to generate first and second outputs; and a time-to-digital converter (TDC) core to receive the first and second outputs, and to generate a third output, wherein the switching device is operable to couple the first input to the first output or to couple the first input to the second output according to a control input.

Abstract: A pseudorandom signal is received and used to train a link. Inversions of the pseudorandom signal are included and detected to identify a transition from link training data to a characterization data. The characterization data can be used to test or otherwise assess the link.

Abstract: Described is an apparatus which comprises: a switching device to receive first and second inputs, and to generate first and second outputs; and a time-to-digital converter (TDC) core to receive the first and second outputs, and to generate a third output, wherein the switching device is operable to couple the first input to the first output or to couple the first input to the second output according to a control input.

Abstract: A method according to one embodiment may include generating, by an integrated circuit including calibration controller circuitry including a comparator, at least one reference voltage. The method of this embodiment may also include calibrating, by the calibration controller circuitry, at least one reference current signal by comparing, by the comparator, a signal proportional to the reference current signal and at least one reference voltage. The method of this embodiment may further include calibrating, by the calibration controller circuitry, at least one resistance value control signal, by comparing, by the comparator, a signal proportional to at least one resistance value control signal and at least one reference voltage.