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Patrick M Gannon, Michael Ignatowski, Matthew A Krygowski, Lishing Liu, Donald W Price, William K Rodiger, Gregory Salyer, Yee Ming Ting, Michael P Witt: Coherence control by data invalidation in selected processor caches without broadcasting to processor caches not having the data. International Business Machines Corporation, Bernard M Goldman, November 23, 1993: US05265232 (79 worldwide citation)

A coherence directory and its methods of operation are disclosed for private processor caches in a multiple processor system to control data coherence in the system. It provides cross-invalidate (XI) controls for the assignment of exclusive and public ownership to data units in the processor caches, ...


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Matthew A Krygowski, Benedicto U Messina, William D Silkman: System for independent cache-to-cache transfer. International Business Machines Corporation, Bernard M Goldman, March 5, 1985: US04503497 (59 worldwide citation)

The disclosure provides a plurality of embodiments for controlling the bus paths for a line of data from any cache in a multiprocessing system (MP) to any requesting cache or I/O channel processor in the MP. The data transfers can occur in parallel among plural CPU caches, channel processors and mai ...


3
Thomas M Brey, Matthew A Krygowski, Bruce L McGilvray, Trinh H Nguyen, William W Shen, Arthur J Sutton: Excessive error correction control. International Business Machines Corporation, Bernard M Goldman, December 28, 1993: US05274646 (46 worldwide citation)

A method of automatically invoking a recoverable and fault tolerant implementation of the complemented/recomplemented (C/R) error correction method without the assistance of a service processor when an excessive error is detected in main storage (MS) by ECC logic circuits. An excessive error is not ...


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George L Chiesa, Matthew A Krygowski, Benedicto U Messina, Theodore A Papanastasiou: Direct parallel path for storage accesses unloading common system path. International Business Machines Corporation, Bernard M Goldman, March 31, 1987: US04654778 (32 worldwide citation)

A fast path (comprising control and data busses) directly connects between a storage element in a storage hierarchy and a requestor. The fast path (FP) is in parallel with the bus path normally provided through the storage hierarchy between the requestor and the storage element controller. The fast ...


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Matthew A Krygowski: Channel storage adapter. International Business Machines Corporation, Robert Lieber, August 29, 1978: US04110830 (24 worldwide citation)

This adapter operates in time division multiplex mode between an input/output channel processing subsystem and a storage access subsystem of a data processing system. The adapter is capable of sustaining multiple processes of information transfer concurrently relative to both subsystems. It is also ...


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Robert S Capowski, Matthew A Krygowski, Terrence K Zimmerman: Request forwarding system. International Business Machines Corporation, Robert Lieber, November 21, 1978: US04126897 (16 worldwide citation)

Storage access requests are forwarded from plural input/output channels to shared main storage. An address word in each request designates the identity of the source channel (CHID) and "destination" address (of a doubleword space in storage relative to which one, two or four "data" words shall be tr ...


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Matthew A Krygowski, Arthur J Sutton: Memory and system for recovery/restoration of data using a memory controller. International Business Machines Corporation, Bernard M Goldman, Lily Neff, May 20, 1997: US05632013 (14 worldwide citation)

A method and device for correcting hardware errors without loss of resources while maintaining continuous operation of the computer system. Same method and device can be used for repair or addition of hardware parts to this system. The method and device can operate in a fault tolerant system which a ...


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Frank P Cartman, Brian W Curran, Matthew A Krygowski, Tin Chee Lo, Sandy N Luu, Sanjay B Patel, William W Shen: Memory access system including a memory controller with memory redrive circuitry. International Business Machines Corporation, Lynn L Augspurger, Whitham Curtis Whitham & McGinn, December 26, 1995: US05479640 (5 worldwide citation)

A memory access system for improving memory access when addressing dynamic random access modules (DRAMs). The memory access system includes a main memory and a memory controller. To improve memory access, both the memory controller and the main memory hardware remember the row address of the last ac ...


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Matthew A Krygowski, Arthur J Sutton: Device and method for fault tolerant dual fetch and store. International Business Machines Corporation, Lily Neff, May 13, 1997: US05630045 (5 worldwide citation)

Fault tolerant systems allow continuous service during the occurrence of a hardware failure. To provide such service, usually dual copies of data are stored in case of a hardware failure affecting the original copy. This dual copying causes the system an overall performance degradation. The present ...


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