International Business Machines Corporation

Donald J Hanrahan

David James Shippy

Alfred T Rundle

Timothy V Bolan

Brice J Feal

George A Fax

Josephine A Boston

Bruce J Morehead

Bernhard Laubli

David A Ring

A plurality of processors are connected to the interprocessor communications facility in the multiprocessing system of the invention. The interprocessor communications facility has arbitration circuitry, mailbox circuitry, and processor interrupt circuitry. The interprocessor communications facility of the invention is centralized and does not require the use of main storage. This enables processors to communicate with each other in a fast and efficient manner. The arbitration circuitry prevents simultaneous access of the interprocessor communications facility by more than one processor, and decodes the commands sent from the processors and routes them to the processor interrupt circuitry or to the mailbox circuitry, depending on the command. The mailbox circuitry of the invention receives messages from sending processors and provides them to the intended receiving processors in a safe and secure manner. The processor interrupt circuitry facilitates the interprocessor communications process by handling interprocessor interrupts.

Multiprocessing system with interprocessor communications facility

An apparatus for suspending processor operation in response to an error indication wherein the processor is cycled to a known state prior to the stopping of the system clock to enable the system to be interrogated in order to determine the cause of the error indication.

Programmable quiesce apparatus for retry, recovery and debug

In a data bus system which links a plurality of users, user access to the bus is provided by an arbiter which responds to a plurality of user requests for bus access by employing an adjustable priority scheme for granting access. When a user has access to the bus, the arbiter updates user priority by assigning the lowest priority to the current user and upwardly adjusting the priorities of all currently-requesting users.

Least recently used arbiter with programmable high priority mode and

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Endwell, NY, United States of America

Donald J Hanrahan