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:
Jul. 13, 1999
Filed:
Nov. 19, 1997
Maria L Melo, Houston, TX (US);
Robert Allan Lester, Houston, TX (US);
Compaq Computer Corporation, Houston, TX (US);
Abstract
Arbitration circuitry in a computer system having a plurality of arbiters for arbitrating requests from bus masters on a PCI bus and an EISA bus. Each of the PCI and EISA buses have a plurality of masters. The PCI bus utilizes a modified LRU arbitration scheme, while the EISA bus utilizes a rotating priority scheme. The arbiter on the EISA bus includes a first level of arbitration and a second level of arbitration. The first level is assigned a plurality of requester types to determine the priority between the requestor types. Certain of the first level requestor types include a plurality of devices. If one of those certain requestor types wins priority on the first level arbitration cycle, a second level arbitration is performed to determine the priority between the plurality of devices.