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:
Sep. 10, 1996
Filed:
Nov. 07, 1994
Uri Elazar, Alon Hagalil, IL;
Yehuda Peled, Bet Shearim, IL;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A PCI system is provided with a shadow register and a shadow timer. When a master device sends an address designating a target device that is connected to another bus, the device's latency value is recorded in the shadow register. While the PCI-PCI bridge arbitrates for the target bus, the master's latency timer increments but the shadow timer will not begin to increment until the PCI-PCI bridge receives a grant# from the target's bus and data transmission begins. Accordingly, the bus arbiter will not de-assert the grant# until the shadow timer has reached the latency value or the master device has released the bus after completing its data transmission. This ensures that the master device will be allocated a time period equal to its latency value to transmit data.