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Machine for Automatic Failure Indication

IP.com Disclosure Number: IPCOM000093575D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Bouricius, WG: AUTHOR [+4]

Abstract

The operation and organization of an automatic failure indication machine is indicated in the drawing. The machine contains a memory CD to store the circuit description of the various functional components of the machine being monitored. The circuits are described by a list L of logic blocks, the i-th entry giving the logic function performed by each block and a predecessor list F giving, for each block, the ensemble of all blocks which feed it. A Test T is stored in a special memory Test M. The test consists of an ensemble of binary values to be applied to the primary inputs of the machine, one value for each primary input. Then Test T together with the Circuit Description is injected into the D Chain Termination Box.

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Machine for Automatic Failure Indication

The operation and organization of an automatic failure indication machine is indicated in the drawing. The machine contains a memory CD to store the circuit description of the various functional components of the machine being monitored. The circuits are described by a list L of logic blocks, the i-th entry giving the logic function performed by each block and a predecessor list F giving, for each block, the ensemble of all blocks which feed it. A Test T is stored in a special memory Test M. The test consists of an ensemble of binary values to be applied to the primary inputs of the machine, one value for each primary input. Then Test T together with the Circuit Description is injected into the D Chain Termination Box.

The letter, starting with the primary outputs and working backward, ascertains whether the D Chain of the failure connected with the block under consideration would reach a primary output.

It is shown in the IBM Journal of Research and Development, July 1966, pages 278-291 that the failure under consideration is detected by the test if and only if the D Chain of the failure and test does reach a primary output. The status of the failure with respect to the test under consideration is stored in the Recorder of Status. The latter, in turn, steps a counter to progress to the next block to be tested. When all blocks are tested, including finally the primary inputs, the testing machine stops.

The tests and the ci...