AVAILABILITY AND DIAGNOSTIC APPARATUS FOR MEMORY MODULES

摘要

In a semiconductor memory module associated with a data processing unit, a maintenance status register and associated apparatus identity and store information relating to erros arising in the memory module. The stored information is transferred from the maintenance status register, upon receipt of a proper command signal, to the data processing unit for diagnostic and availability analysis. A mode of operation of the maintenance status register is provided for checking logic circuits associated with the refresh apparatus of the semiconductor memory elements under control of the data processing unit. Information concerning errors in data entering the memory module is also available to the maintenance status register and associated equipment.