The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 1996
Filed:
Sep. 25, 1992
Ashish B Dixit, Union City, CA (US);
Earl A Killian, Los Altos, CA (US);
Silicon Graphics, Inc., Mountain View, CA (US);
Abstract
A TLB which has at least two page frame numbers (PFN) associated with each tag (Virtual Page Number) is provided. Thus, a match will produce two possible physical page frame numbers. The selection between these two is controlled by a bit provided directly from the virtual address, without translation. This bit is preferably the least significant bit of the virtual page number, or the first bit after the physical offset. This structure effectively doubles the capacity of the TLB without doubling the number of tags. Although the virtual space covered by each tag or VPN is necessarily restricted to two contiguous areas, the invention allows these two contiguous areas to be mapped to completely different regions of the physical address space. In addition to limiting the number of tags required, the number of comparators required is also similarly limited, with only the number of physical page frame numbers stored being required to double.