Computer system and system expansion unit
US5557754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1993 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Apr 20, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4031
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
To enable a computer system such that each local arbiter is supposed to output its own priority as the right to use the bus on a common arbitration bus through open-collector-type drivers to determine a winner in arbitration, to expand the bus by way of a channel different from bus signal lines. Certain representation features 73 and 79 having the functions of a local arbiter that represent the arbitration level of the other bus are provided in both a primary system and a secondary system linked via a channel in a signal transmission mode different from the signal transmission mode of the bus. Arbitration is first conducted on each of the buses of the primary and secondary system to determine winners in arbitration. Notification of the arbitration level of each winner is made through a channel to the representation feature on the other bus. After this notification, arbitration is conducted once again between a winner in arbitration on each bus and the representation feature representing the arbitration level of the other bus to determine a final winner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.