Lsi Logic Corporation

Lsi Corporation

Wiliam Petty

Jeffrey J Gauvin

Stephen B Johnson

Christopher McCarty

A method for back-off retry with priority routing in a single, cohesive SAS expander includes routing a data transfer between an input of a single, cohesive SAS expander and an output of the single, cohesive SAS expander, wherein the single, cohesive expander includes a first SAS expander, and at least one additional SAS expander via at least one inter-expander link (IEL). The routing of data may further include routing a first OPEN request on a direct path through the first SAS expander to a port of a device and routing a second OPEN request on an alternate path from the first SAS expander and through a second SAS expander to the port of the device. The method further includes determining link availability between the second SAS expander and the port of the device, and, upon determination of a failed link or a busy link, re-routing the data transfer from the second SAS expander to the first SAS expander or a third SAS expander, or retrying the data transfer through the second SAS expander.

Back-off retry with priority routing

A bus interface and a receiver in the bus interface receive signals from a computer bus, such as a SCSI (Small Computer System Interface) bus, and deskew and synchronize the signals into valid data and control signals. The signals are aligned and then a portion of the signals is offset to ensure that the other signals have sufficient time to stabilize before being latched. The alignment is performed by adding and subtracting delay units to and from the signals. The offset is determined by a self-calibration logic that uses the same type of delay units.

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Colorado Springs, CO, United States of America

Wiliam Petty