Software based native command queuing

Details Software based native command queuing Software based native command queuing

2005-10-12

2009-11-17

Patel, Niketa I (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S005000, C710S048000, C709S212000, C711S112000

Reexamination Certificate

active

07620747

ABSTRACT:
Systems and methods for performing native command queuing according to the protocol specified by Serial ATA II for transferring data between a disk and system memory are described. Native command queuing context for queued commands is maintained by a host controller device driver and is provided to the host controller as needed to process the queued commands. The host controller is simplified since it only stores the context of the one command being processed. The host controller generates a backoff interrupt when a command cannot be queued. The host controller generates a DMA transfer context request interrupt to request programming of the registers that store the context for the one command being processed.

REFERENCES:
patent: 5428779 (1995-06-01), Allegrucci et al.
patent: 5761454 (1998-06-01), Adusumilli et al.
patent: 2004/0158669 (2004-08-01), Weng et al.
Huffman et al, “Serial ATA Native Command Queuing”, Joint Whitepater By : Intel Corporation and Seagate Technology, Jul. 2003.

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