Microprocessor including an interrupt polling unit configured to poll external devices for interrupts using interrupt acknowledge bus transactions
US5687381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Feb 9, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An interrupt polling unit included within a bus interface unit of a microprocessor is provided. The interrupt polling unit causes a periodic interrupt acknowledge bus transaction to occur. If an interrupt controller receiving the interrupt acknowledge bus transaction returns an interrupt vector indicative of an interrupt service routine, then the microprocessor executes the interrupt service routine. The number of interrupt acknowledge bus transactions associated with the interrupt is reduced from two to one, and the microprocessor effectively prefetches the interrupt service routine before the interrupt is actually signaled. In one embodiment, the interrupt polling unit causes an interrupt acknowledge bus transaction to occur at the expiration of a programmable time interval. Another embodiment of the interrupt polling unit causes an interrupt acknowledge bus transaction subsequent to the occurrence of a bus transaction programmed by the user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.