Compaq Computer Corporation, Inc.

Eric E Rose

Siamak Tavallaei

Paul R Culley

Alan L Goodrum

Joseph P Miller

Jeffrey S Autor

Elizabeth A Richard

Barry P Basile

A device causing a faulty condition in a computer system having devices is isolated by detecting for a faulty condition associated with the devices and identifying the device causing the faulty condition. The devices are coupled to a bus. The faulty condition includes a bus hang condition. The devices are turned off when a bus hang condition is detected. The devices are then turned back on to test the devices. Each device is tested by writing and reading its configuration space. Information on the bus associated with the faulty condition is stored. The stored information is retrieved after the faulty condition has occurred, with the stored information including address, data, and bus control information.

Method and apparatus for identifying faulty devices in a computer system

A computer system employing a bus protocol violation monitor system and method. The monitor system includes a bus wait timer logic circuit which comprises a state machine that receives a portion of the bus interface control signals, a programmable timer module and a plurality of data selectors that are actuatable responsive to a control input. In addition to storing the violation information in a register, the system provides for interrupts with graded levels of priorities.

Bus protocol violation monitor systems and methods

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Houston, TX, United States of America

Eric E Rose