Apparatus for conditioning priority arbitration
US5301279A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Nov 24, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/362
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data processing system including an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.