Access control to a shared resource in an asynchronous system
US4660169A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1983 |
| Grant date | Apr 21, 1987 |
| Priority date | — |
| Expiry date | Jul 5, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/37
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Independent asynchronous bus master devices share a common bus with control lines serially connecting each bus master in a daisy-chain contiguration. A Bus Acknowledge signal is received by a local bus master which is thereby enabled to seize control of the bus without an input synchronization delay by first inhibiting synchronization means to prevent the passage of the Bus Acknowledge signal to a downstream device for a period of time sufficient to stabilize an output signal indicating such passage. In that manner, the output signal may be used to control the immediate enabling of local bus seizure thereby avoiding local synchronization delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.