International Business Machines Corporation

Western Digital Technologies, Inc.

Lynn Charles Berning

David Robison Hall

Richard Greenberg

Richard Henry Mandel, Iii

Clark A Anderson

Anthony Edwin Welter

Eric L Severtson

Louise Ann Marier

Daniel R Ostrander

Henry H Tsou

Carlos H Morales

Robert Joseph Harvey

Curtis Adam Harper

Aleksandr Dean Schwerdt

Thanh Duc Nguyen

Hung M Vu

David Alexander Jachmann

An apparatus for electrically coupling an electrical interface of a unit under test with a debugging component includes a bracket assembly having a socket configured to electrically couple with the electrical interface, a baseplate assembly configured to secure the unit under test on a plate, a crane assembly coupled to the bracket assembly, and a cable assembly. The crane assembly is configured to enable movement of the socket relative to the electrical interface in each of a horizontal direction, a vertical direction, and an angular direction; and secure the socket in place relative to the electrical interface while applying a force by the socket against the electrical interface. The cable assembly is associated in part with the bracket assembly and is configured to electrically couple with the socket at a first end and with the debugging component at a second end.

Apparatus and method for electrically coupling a unit under test with a debugging component

A system and method are provided for hard disk drive command queue ordering with locational uncertainty of commands. For each command in the hard disk drive command queue, an expected access time is calculated utilizing a probability distribution for a currently executing command and a probability distribution for a candidate command. A command in the hard disk drive command queue having a minimum calculated expected access time is identified. Then the identified command having a minimum calculated expected access time is executed. The probability distribution for a currently executing command represents an ending location distribution for the currently executing command. The probability distribution for a candidate command represents a starting location distribution for the candidate command. For an estimated seek time of less than a time for one full revolution, a probability of a miss multiplied by a time of one extra revolution and multiplied by a candidate arrival probability is calculated and the result is added to an estimated seek time to provide the expected access time. For an estimated seek time of greater than a time for one full revolution, a probability of a make multiplied by a time of one extra revolution and multiplied by a candidate arrival probability is calculated and the result is subtracted from an estimated seek time to provide the expected access time.

System and method for scheduling of random commands to minimize impact of locational uncertainty

An electrical signal is communicated between a first device and a second device during a plurality of active clock periods, where the electrical signal is in one of multiple possible states during each of the active clock periods. Timing circuitry within one of the first and second devices detects a predetermined sequence of states in the electrical signal, and in response to detecting the predetermined sequence, adjusts the timing of a subsequent state of the electrical signal with respect to an associated active clock period. Adjustment of signal timing in this manner is useful in reducing signal error due to the line charging effect.

Method and system for selectively varying signal delay in response to detection of a quiescent signal

A method and apparatus are provided for implementing automatic cache variable update. A cache variable update hardware maintains a plurality of variables indicative of a data segment in the cache. The plurality of variables include a segment state variable, a segment starting address variable, a segment length variable and a segment offset variable. The cache variable update hardware monitors the cache to identify a selection of a segment for a data transfer to and from the cache and to identify data transfers. The plurality of variables are initialized responsive to an identified cache search. The segment length variable is incremented responsive to a data block written to the cache. The segment state variable is modified responsive to a data transfer complete.

Method and apparatus for implementing automatic cache variable update

If consecutive read or write requests imposed on a DASD are of the same type and bear a defined sequential logical address relationship (pure sequential, near sequential), then a circular buffered data path using a pair of a synchronously managed read/write ports respectively coupling either a cyclic, concentric, multitracked storage medium or a cyclic, spiral-tracked storage medium and a device interface can continue data streaming unabated. Otherwise, the path would ordinarily have to be disabled and reconnected using a control microprocessor in respect of any random sequence of requests.

Disk drive initiated data transfers responsive to sequential or near

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Rochester, MN, United States of America

Lynn Charles Berning