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:
Aug. 12, 1997
Filed:
Apr. 16, 1992
Richard Lary, Colorado Springs, CO (US);
Robert Willard, Andover, MA (US);
Catharine van Ingen, Shrewsbury, MA (US);
David Thiel, Colorado Springs, CO (US);
William Watson, Redmond, WA (US);
Barry Rubinson, Danville, CA (US);
Verell Boaen, Groton, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A dual addressing arrangement comprises a complex address pointer within entries of a communication queue used by a port driver and an port adapter when exchanging information in a host computer. The complex address pointer comprises a virtual address portion and a physical address portion. The port driver uses the virtual address portion to ascertain the location of entry structures, while the port adapter uses the physical address portion to locate the structures in a host memory. The arrangement and interpretation of the address portions of the complex pointers within an entry depend upon the direction of information flow, i.e., the passing of messages from the port driver to the port adapter using a driver-to adapter queue or the passing of responses from the adapter to the driver using an adapter-to-driver queue.