Circuit control system and method for dynamically adjusting voltage and frequency

A circuit control method for dynamically adjusting voltage and frequency, comprising following steps:

• step A, scanning for status of working behavior of a target circuit under the current condition, and according to a result of said scanning for status or directly according to a preset result, selecting a voltage-frequency corresponding relation curve for said target circuit under the current condition from a lookup table containing voltage-frequency corresponding relation curves of the target circuit under one or more working conditions, wherein, said scanning for status comprises:
• according to variation characteristics of factors including input frequency, input voltage and delay path of a speed detecting circuit, judging to acquire a result whether the speed detecting circuit is able to work normally or not able to work normally, by means of adjusting said factors from stage to stage;
• step B, under the current condition, when said target circuit executes a working task, acquiring a target frequency value required to execute said working task, and according to said target frequency value and said voltage-frequency corresponding relation curve selected for said target circuit, computing a target voltage value required to execute said working task;
• and
• step C, according to a relative difference between a frequency value of said target circuit under the current condition and the target frequency value, and according to a relative difference between a voltage value of the target circuit under the current condition and the target voltage value, combinedly adjusting the working voltage and the working frequency of said target circuit in a preset sequence smoothly.