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Browse Prior Art Database

Access Protocol for Bilateral Bus with Unilateral Control Wire

IP.com Disclosure Number: IPCOM000050375D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10

Publishing Venue

IBM

Related People

Authors:
Fratta, L [+details]

Abstract

This invention relates to a method for accessing a contention-free bilateral bus shared among N transceiving ports. A unidirectional signal wire also couples and orders (arranges) the ports 1,2..j..N. In the prior art, Eswaran (U.S. Patent 4,292,623) described a bus accessing protocol requiring each port to intent signal higher order ports j..N, pause for a stipulated period, and transmit on the bus only in the absence of a received intent signal from lower order ports 1..(j-1) and a free bus. Significantly, this art requires each port to lock onto the bus until message completion.