ADAPTIVE VOLTAGE SCALING CLOCK GENERATOR FOR USE IN A DIGITAL PROCESSING COMPONENT AND METHOD OF OPERATING THE SAME

摘要

There is disclosed clock control circuitry (705,710, 715) for selectively applying a clock signal to a digital processing component (100) wherein the clock signal is capable of being changed to a plurality of operating frequencies. The clock control circuitry (705,710, 715) is operable to (i) receive a command to change a first operating frequency to a second operating frequency,(ii) in response to the command, disable the applied clock signal,(iii) generate a test clock signal having the second operating frequency,(iv) apply the test clock signal to a power supply adjustment circuit (125), and (v) sense a status signal from the power supply adjustment circuit (125). The status signal indicates that a power supply level of the digital processing component (100) has been adjusted to an optimum value suitable for the second operating frequency.