Three phase clock recovery delay calibration

An apparatus comprising:

• means for detecting a series of transitions in signaling state of three or more wires of a multi-wire communications interface, wherein each transition in the series of transitions corresponds to a boundary between consecutive symbols in a preamble transmitted on the multi-wire communications interface;
• means for deriving a receive clock from the series of transitions;
• means for determining a transition region based on the series of transitions;
• means for calibrating a delay period corresponding to a duration of the transition region;
• and
• means for receiving data symbols from the multi-wire communications interface after termination of the preamble, wherein the data symbols are received using a version of the receive clock that is modified based on the delay period.

An apparatus, comprising:

• a processing circuit configured to:
• detect a series of transitions in signaling state of three or more wires of a multi-wire communications interface, wherein each transition in the series of transitions corresponds to a boundary between consecutive symbols in a preamble transmitted on the multi-wire communications interface;
• derive a receive clock from the series of transitions;
• determine a transition region based on the series of transitions;
• calibrate a delay period corresponding to a duration of the transition region;
• and
• receive data symbols from the multi-wire communications interface after termination of the preamble, wherein the data symbols are received using a version of the receive clock that is modified based on the delay period.

A processor-readable storage medium having one or more instructions which, when executed by at least one processing circuit, cause the at least one processing circuit to:

• detect a series of transitions in signaling state of three or more wires of a multi-wire communications interface, wherein each transition in the series of transitions corresponds to a boundary between consecutive symbols in a preamble transmitted on the multi-wire communications interface;
• derive a receive clock from the series of transitions;
• determine a transition region based on the series of transitions;
• calibrate a delay period corresponding to a duration of the transition region;
• and
• receive data symbols from the multi-wire communications interface after termination of the preamble, wherein the data symbols are received using a version of the receive clock that is modified based on the delay period.