Peripheral bus with continuous real-time control
US4720783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1981 |
| Grant date | Jan 19, 1988 |
| Priority date | — |
| Expiry date | Aug 24, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/001
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital data processing system wherein large amounts of digital data are transferred from a source that is coupled to the internal bus of a host CPU to a data receiving device by cooperation between the host CPU and a microprocessor. A multiplexer has one of its input ports coupled to the host bus and its output port coupled by way of what is called a non-real-time bus to one or more devices that may be destinations for large amounts of data and need to be under at least periodic or non-real-time control by the microprocessor. Another bus, called a real-time bus, couples the microprocessor to another input port of the multiplexer. All digital devices that require real-time control by the microprocessor are coupled to the real-time bus. For data transfer, the microprocessor causes the multiplexer to couple the host bus to the non-real-time bus at which time the processor suspends control over the non-real-time devices but maintains control over the devices coupled to the real-time bus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.