Inter-bus system
US4728754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Aug 29, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/37
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The inter-bus system provides the communication interconnection between communication systems to form a large telegraph packet switching exchange for example. The fast inter-bus system uses an RS-485 interface, however, the specific protocol used has particular speed advantages. The inter-bus system consists of a bus converter for each communication system interconnected by a bus involving 16 data bits, a pair of parity bits, clock, abort, transmit active, address strobe and grant return paths. The bus converters are chained by a grant link arrangement. The grant link is used to carry a grant pulse which is passed on around the chained bus converters to identify the master converter for an inter-bus system transfer. When the grant pulse is received by a bus converter wanting to transmit, that bus converter breaks the chain and performs the transmission required. When the transmission is complete the completing bus converter surrenders its master state by generating the grant pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.