Electrical computers and digital processing systems: memory – Addressing combined with specific memory configuration or... – Addressing extended or expanded memory
Patent
1996-03-29
1998-03-24
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Addressing combined with specific memory configuration or...
Addressing extended or expanded memory
711 3, 711202, 711 5, 711 6, 711200, 711203, G06F 1204, G06F 1210
Patent
active
057324042
ABSTRACT:
A multiple-word virtual address flexibly expands the virtual address space of a computer system without requiring the modification of the word size of the computer system. In a memory system having a virtual memory mapped to an absolute memory, the virtual memory is divided up into multiple levels each having a plurality of memory banks. Each memory bank has a plurality of words. The multiple-word virtual address provides a plurality of words for specifying the virtual memory level, memory bank, and offset word within the memory bank, to describe a selected memory location. Special instructions are added to the instruction set architecture to set up a window of program visibility, called a peephole, into a selected area of the expanded virtual memory. Existing programs are compatible with the multiple-word addressing scheme, and can also reference virtual memory through a defined peephole. New programs using multiple-word virtual addresses can still call procedures requiring single word virtual addresses.
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Johnson David Randal
Ward Wayne Douglas
Chan Eddie P.
Johnson Charles A.
Nguyen Than V.
Starr Mark T.
Unisys Corporation
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