System for initiating data transfer between input/output devices having separate address spaces in accordance with initializing information in two address packages
US5603057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | Feb 11, 1997 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4217
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system in a data processing system for transferring data from a first device to a second device within the data processing system. The data processing system includes a data bus, an address bus, a first address space associated with a memory and a second address space associated with an input/output device. Initially, a transfer signal is transmitted in the data processing system. The transfer signal identifies the transfer as a transfer concerning an address in the second address space associated with the input/output device. A first address package is then transmitted to the second device from the first device on the address bus. The first address package includes a transfer identifier, a first identifier associated with the first device and a second identifier associated with the second device. A second address package, comprising a byte count and an address, are transmitted to the second device from the first device on the address bus. If data is to be transferred, the data is then transferred on the data bus. Finally, a reply signal may be transmitted between the first and second devices, acknowledging the success or failure of the data transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.