Digital Equipment Corporation

Quantum Corporation

Joseph F Rantala

John K Grooms

David W Hartwell

Lawrence A Chisvin

Charles F Cassidy

A memory system having volatile storage of data destined for secondary storage and smaller intermediate non-volatile storage of some of the data. The volatile memory is an array of DRAM storage devices integrated with the non-volatile memory array of SRAM devices by a mapping logic unit. The DRAM array stores all the data blocks destined for secondary storage. In contrast, the smaller SRAM array stores only the data requiring safe storage, which typically is a subset of the data stored in the DRAM array. The mapping logic unit manages the use of the SRAM array.

Memory system with dynamically allocatable non-volatile storage

Methodology and circuitry for managing read and write commands from nodes to a shared memory resource on a common data bus, including nodes with write-back caches, nodes with write-through caches and nodes without caches.

Growing community of inventors

Worcester, MA, United States of America

Joseph F Rantala