Nominal distance reference voltage calibration

A method comprising:

• performing, using a calibration circuit, a plurality of horizontal calibrations at different reference voltage values to determine a calibrated reference voltage, wherein the reference voltage values are used to distinguish between logic values read from a memory by a memory controller, and wherein ones of the plurality of horizontal calibrations comprise determining a range of delay values applied to a data strobe signal at which valid data is read from the memory;
• determining, using the calibration circuit, scores corresponding to ones of the plurality of horizontal calibrations, wherein a score for a particular one of the plurality of horizontal calibrations is based on a corresponding range of delay values and a reference voltage margin;
• and
• selecting, using the calibration circuit, the calibrated reference voltage based on the scores corresponding to ones of the plurality of horizontal calibrations.

A system comprising:

• a memory subsystem including a memory coupled to a memory controller, wherein the memory controller includes a calibration circuit configured to perform reference voltage calibrations, wherein, in performing the reference voltage calibrations, the calibration circuit is configured to:
• perform a plurality of horizontal calibrations at different reference voltage values, and wherein ones of the horizontal calibrations comprise determining a range of delay values applied to a data strobe signal at which valid data is read from the memory;
• determine scores corresponding to ones of the plurality of horizontal calibrations, wherein a score for a particular one of the plurality of horizontal calibrations is based on a corresponding range of delay values and a reference voltage margin;
• and
• select a calibrated reference voltage based on the scores corresponding to ones of the plurality of horizontal calibrations.