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Dynamic Corrective Procedure for Logic Faults within the Domain of a Control Store

IP.com Disclosure Number: IPCOM000080379D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Henion, RR: AUTHOR [+3]

Abstract

Without the technique to be described, problems discovered during systems design test must await the design, manufacture and installation of new parts before the problem is corrected. This creates serious consequences in system test. There is the possibility of logic faults which preclude continued progress in system debug until the problem is corrected. A mechanism is described which will allow dynamic application of a temporary corrective process, which will alleviate logic and hardware faults.

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Dynamic Corrective Procedure for Logic Faults within the Domain of a Control Store

Without the technique to be described, problems discovered during systems design test must await the design, manufacture and installation of new parts before the problem is corrected. This creates serious consequences in system test. There is the possibility of logic faults which preclude continued progress in system debug until the problem is corrected. A mechanism is described which will allow dynamic application of a temporary corrective process, which will alleviate logic and hardware faults.

The figure presents a simplified drawing of a processor 1 and service system
2. The processor is microprogram controlled from a control store 3 and decoder
4. All storage devices (triggers) in the Data Flow 5 are implemented and interconnected in a manner such as to form shift register loops. This technique allows for Scan In/Scan Out. The Logic Interface Unit 6 (LIU) provides for communication of such functions as Scan In, Scan Out, Clock Stop, Clock Start, etc.

The service system 2 consists of an intelligent, programmable processor 7 and storage 8 with the appropriate program modules which support the functions it performs.

A given trigger in the data flow will store a value which is determined by a logic function generated by one or more input signals. A logic fault exists when the resultant state of the trigger is incorrect or unwanted for a given state of the input signals.

The philos...