Serial tunneling protocol (STP) flow control in SAS...

Details Serial tunneling protocol (STP) flow control in SAS... Serial tunneling protocol (STP) flow control in SAS...

2009-01-16

2010-06-29

Sorrell, Eron J (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output data buffering

C710S057000, C710S065000, C709S230000

Reexamination Certificate

active

07747794

ABSTRACT:
A method and apparatus are disclosed for implementing STP flow control in SAS expander devices. SAS expanders are commonly used within a SAS network topology to allow multiple disk drives to connect to multiple host devices. Connections to a SATA HDD are supported using SATA Tunnelling Protocol (STP), which allows SATA traffic to be carried over a SAS network topology. Flow control in a STP connection is applied through a set of special SATA primitives, both for forward and backward flow control. A method is described herein in which STP flow control is supported without the use of a SATA link layer state machine. This allows STP flow control to be terminated on a hop-by-hop basis without knowing the data channel direction or maintaining a SATA link state machine, and while minimizing gate count.

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