MEMORY CONTROLLING SYSTEM

PURPOSE:To permit a temporary defect and to detect a permanent defect of an RAM with a simple constitution, by checking the result of transfer at every time the external storage information is transferred to the RAM to process a memory error. CONSTITUTION:The contents of an external storage device (...

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Bibliographic Details
Main Author ITOU TOORU
Format Patent
LanguageEnglish
Published 15.08.1983
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
INFORMATION STORAGE
PHYSICS
STATIC STORES
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Summary:PURPOSE:To permit a temporary defect and to detect a permanent defect of an RAM with a simple constitution, by checking the result of transfer at every time the external storage information is transferred to the RAM to process a memory error. CONSTITUTION:The contents of an external storage device (a) are written to an RAMb via a control circuit (d) in responding to the signal that is delivered at every fixed time from a timer circuit (c). At the same time, the information written into the RAMb is compared with the information read out of the RAMb through a comparator (c). If no coincidence is obtained from this coparison, the circuit (d) performs an error process that is needed for a memory error. In this case, a temporary defect of the RAM is corrected by the synchronizing output of the circuit (c), and then a permanent defect is detected by the discordant output of the circuit (c) respectively with a simple constitution requiring no error correcting circuit.
Bibliography:Application Number: JP19820018606