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Error Correction by Reconfiguring

IP.com Disclosure Number: IPCOM000091555D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Heasley, JE: AUTHOR [+2]

Abstract

Redundancy is utilized to maintain data handling logic circuits in continuous operation and to provide for reverting to the same configuration when power is applied. Multiple Logic Units, such as unit X, include two almost identical half-units X Logic and X Replacement Logic which are enabled by opposite phases of a switching signal. The switching signal is provided by a corresponding X bit position of Control Register C.

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Error Correction by Reconfiguring

Redundancy is utilized to maintain data handling logic circuits in continuous operation and to provide for reverting to the same configuration when power is applied. Multiple Logic Units, such as unit X, include two almost identical half- units X Logic and X Replacement Logic which are enabled by opposite phases of a switching signal. The switching signal is provided by a corresponding X bit position of Control Register C.

Back-up control register CB, within core storage unit S, reflects the condition of register C at all times. Initially, registers C and CB are set to predetermined states coinciding with enablement of the X Logic portion of each Logic Unit. Upon determination that an error exists which is localized in X, such determination being made by detection and diagnostic logic D, the corresponding X bit condition in C is reversed, disabling the X Logic and enabling the X Replacement Logic. At such times an X fault indicator trigger is conditioned to signal, e.g., via a control panel indicator light, the partial disability of the X Logic Unit. The new condition of C is written into CB in response to a Unit Error signal furnished by circuit UE.

When, at a convenient later time, a half-logic circuit is repaired or replaced by maintenance personnel, the condition of the corresponding X bit in C is reversed under manual control and the new condition of C is again written into CB. Recovery from momentary power interruption or p...