Electrical computers and digital processing systems: support – Computer power control – Power conservation
Reexamination Certificate
2006-03-07
2006-03-07
Browne, Lynne H. (Department: 2116)
Electrical computers and digital processing systems: support
Computer power control
Power conservation
C713S300000, C713S322000, C713S324000, C710S022000
Reexamination Certificate
active
07010711
ABSTRACT:
The present invention is directed to a method and apparatus of automatic power management control for Serial ATA interface. In an exemplary aspect of the present invention, an idle or active condition of a Serial ATA interface including a NCQ Serial ATA device is automatically detected. In this step, it is determined, preferably based on a value of the FPDMA (First Party Direct Memory Access) bit in a Task File Ram of the Serial ATA interface, whether the NCQ Serial ATA device is in a FPDMA Data Phase. When the NCQ Serial ATA device is in a FPDMA Data Phase, the Serial ATA interface is active (i.e., not idle). When Serial ATA is in an idle condition, idle time of Serial ATA interface is measured using a power down counter whose frequency is determined by a programmable register based on an input clock. When a power down counter value is equal to a first value, a request for a Partial power state is asserted, and Serial ATA interface is put into a Partial power state. When a power down counter value is equal to a second value, a request for a Slumber power state is asserted, and Serial ATA interface is put into a Slumber power state.
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patent: 2004/0148533 (2004-07-01), Nicholas
Ayyavu Vetrivel
Bashford Patrick R.
Day Brian A.
Viswanathan Ganesan
Browne Lynne H.
LSI Logic Corporation
Suiter-West-Swantz PC LLO
Trujillo James K.
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