Method and system for providing self-calibration for adaptively adjusting a power supply voltage in a digital processing system

A method for providing self-calibration for adaptively adjusting a power supply voltage in a digital processing system, comprising:

• setting a tap signal to a highest value;
• propagating a regulator clock signal through a delay line, the delay line comprising a plurality of delay cells;
• sampling a first pair of taps in the delay line, each tap corresponding to one of the delay cells;
• determining whether the first pair of taps corresponds to a first and second delay cell, the first and second delay cells identified based on the first delay cell receiving the regulator clock signal and the second delay cell failing to receive the regulator clock signal at a specified time;
• concluding the calibration when a determination is made that the first pair of taps corresponds to the first and second delay cells;
• and
• operating the system using the first and second delay cells to determine whether to adjust a power supply voltage for the system.

A system for providing self-calibration for adaptively adjusting a power supply voltage in a digital processing system, comprising:

• a power supply operable to generate a power supply voltage for the system;
• a slack time detector coupled to the power supply, the slack time detector operable to generate a plurality of detector outputs;
• a multiplexer coupled to the power supply and the slack time detector, the multiplexer operable to receive the detector outputs and to generate a power control signal based on the detector outputs;
• and
• a calibrator coupled to the power supply and the multiplexer, the calibrator operable to identify a subset of the detector outputs to be selected by the multiplexer as the power control signal, the power supply operable to generate the power supply voltage based on the power control signal.