Method for operating a processor at first and second rates...

Details Method for operating a processor at first and second rates... Method for operating a processor at first and second rates...

2006-08-08

2006-08-08

Cao, Chun (Department: 2115)

Electrical computers and digital processing systems: support

Computer power control

C713S320000, C713S322000

Reexamination Certificate

active

07089432

ABSTRACT:
Clock speed of the processor in a hard disk drive is controlled during run time to optimize the trade-off between minimizing power consumption and maximizing performance. Processor clock speed is increased during processing of code more performance critical to the disk drive system, while processor clock speed is reduced when less performance critical code is processed. An example of more critical code where processor clock speed is increased is the code executed by the processor from the start of a servo interrupt until output of resulting servo current command is provided from the processor to the actuator controller. To enable changing processor clock speed, an ASIC containing the disk drive processor is selected which provides the ability to switch clock rates of the processor during processor run time.

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