Method and apparatus for interrupt processing in a computer system having peripheral units connected in a daisy chain
US5119496A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 12, 1988 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Dec 12, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interrupt processing method and an interrupt processing apparatus provides an end indicative information storing unit for storing an end indicative information of a daisy chain for at least one of a plurality peripheral units, the peripheral unit receiving the indicative information when the peripheral unit receives an acknowledge signal but does not output a request signal, and the peripheral unit outputs a specific chain end state signal to the central processing unit, so that the central processing unit is returned from a response waiting state. Therefore, when an error request signal is produced by noise, etc., delay at a central processing unit is reduced. Further, the daisy chain connection is cut at an optional portion and a request signal from an irrevelant peripheral unit is ignored, so that the efficiency of the processing is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.