System and method for bus master emulation
US5890002A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Dec 31, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/385
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method in accordance with the invention allows the emulation of a DMA transfer between a device such as a CD-ROM which is incapable of a bus-mastering mode of operation (e.g., a DMA transfer) and a memory. Following receipt of an interrupt request, a system in accordance with the invention generates an I/O access cycle to the device, retrieves data and stores the data in a buffer. Following data retrieval, the system transfers the data to host memory. Once data is transferred to host memory, an interrupt is generated to the host processor. Thus, host processor resources are not required to perform a data transfer with devices unable to become bus-masters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.