MEMORY PROTECTION

专利名称：MEMORY PROTECTION发明人：STEVEN WALLACH,KENNETH D.

HOLBERGER,STEVEN M. STAUDAHER,DAVIDL. KEATING

申请号：AU4120285申请日：19850412公开号：AU4120285A公开日：19850815

摘要：A data processing system which handles thirty-two bit logical addresses whichcan be derived from either sixteen bit logical addresses or thirty-two bit logicaladdresses, the latter being translated into physical addresses by unique translationmeans. The system includes means for decoding macro-instructions of both a basic andan extended instruction set, each macro-instruction containing in itself selected bitpatterns which uniquely identify which type of instruction is to be decoded. The decodedmacro-instructions provide the starting address of one or more micro-instructions, whichaddress is supplied to a unique micro-instruction sequencing unit which appropriatelydecodes a selected field of each micro-instruction to obtain each successive micro-instruction. The system uses hierarchical memory storage using eight storage segments(rings), access to the rings being controlled in a privileged manner according to differentlevels of privilege. The memory system uses a bank of main memory modules whichinterface with the central processor system via a dual port cache memory, block datatransfers between the main memory and the cache memory being controlled by a bankcontroller unit.

申请人：DATA GENERAL CORP.

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