05349651 is referenced by 31 patents and cites 21 patents.

In the field of high speed computers it is common for a central processing unit to reference memory locations via a virtual addressing scheme, rather than by the actual physical memory addresses. In a multi-tasking environment, this virtual addressing scheme reduces the possibility of different programs accessing the same physical memory location. Thus, to maintain computer processing speed, a high speed translation buffer cache is employed to perform the necessary virtual-to-physical conversions for memory reference instructions. The translation buffer cache stores a number of previously translated virtual addresses and their corresponding physical addresses. A memory management processor is employed to update the translation buffer cache with the most recently accessed physical memory locations. The memory management processor consists of a state machine controlling hardware specifically designed for the purpose of updating the translation buffer cache. The memory management processor calculates an address of a location in the memory where the physical address is stored concurrently with the translation buffer cache comparing the virtual address with already stored virtual addresses. With this arrangement the memory management unit can immediately access memory to retrieve the physical address upon a "miss" by the translation buffer cache.

Title
System for translation of virtual to physical addresses by operating memory management processor for calculating location of physical address in memory concurrently with cache comparing virtual addresses for translation
Application Number
306544
Publication Number
5349651
Application Date
August 9, 1991
Publication Date
September 20, 1994
Inventor
Dwight P Manley
Holliston
MA, US
Tryggve Fossum
Northboro
MA, US
John E Murray
Acton
MA, US
David B Fite
Northboro
MA, US
David A Webb Jr
Berlin
MA, US
Ricky C Hetherington
Northboro
MA, US
Agent
Denis G Maloney
Richard J Paciulan
Assignee
Digital Equipment Corporation
MA, US
IPC
G06F 12/00
G06F 12/10
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