Distributed bus arbitration according each bus user the ability to inhibit all new requests to arbitrate the bus, or to cancel its own pending request, and according the highest priority user the ability to stop the bus
US4620278A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1983 |
| Grant date | Oct 28, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/378
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digital communication bus upon which arbitration is distributed in a multiplicity of communicable interconnected bus interface logics supports unique signals to each associated on user device and upon the bus. Arbitration inhibiting signals, called inhibit request signals, allow any one(s) user device(s) to inhibit the new entrance, via requests, into arbitration of all other bus interconnected bus interface logics and associated user devices. Arbitration among bus interface logics already registering requests continues in priority order. Each user device may, via a signal called retract request, deregister, or cancel, requests previously registered at the associated bus interface logics to arbitrate for ownership of the bus. Each user device may, via a signal called stop bus, cause continuous interface logics while being precluded from recognition that arbitration should ever be won. When the highest priority one user device so exercises the signal stop bus, then its associated bus interface logics always wins arbitrated ownership of the bus, but naught is known by, or done with, any user device of such ownership; effectively meaning the bus is stopped of normal data communicati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.