Patent ID: 7454643

Claim:
A control system for controlling a power supply having an operating function, the power supply to supply an output current to an integrated circuit having at least one circuit block, the at least one circuit block controlled in response to an enable signal, the control system comprising: a receiver to receive the enable signal; a controller to determine a loading status of the at least one circuit block as a function of the enable signal and to control the output current of the power supply as a function of the loading status of the at least one circuit block such that the power supply pre-emptively changes the output current, wherein the at least one circuit block receives and is controlled in response to the enable signal, wherein a clock signal is communicated to the at least one circuit block in response to the enable signal; and a read head external to the at least one circuit block, wherein the at least one circuit block is a read channel; the enable signal is a read gate signal; the clock signal is a read clock; and the read channel controls the read head as a function of the read gate signal and the read clock.