Method of determining devices requesting the transfer of data signals on a bus
US5502821A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4226
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is described for determining readiness of devices in a digital data bus system to transfer data signals. The bus system includes a bus having a clock line for communicating a clock signal, address lines for communicating address signals, data lines for communicating data signals, and control lines for communicating control signals. The bus system also includes a plurality of devices. Each device is connected to the bus and has an address on the bus. At least one device is a source device capable of sending data signals and at least one device is a destination device capable of receiving data signals. A bus controller connects to the bus and controls the bus. The control lines include bus request lines that connect each device to the bus controller for communicating a bus request signal from a device to the bus controller. The bus request signal indicates that the device is ready to send or receive data signals. The bus controller includes matching logic that stores the identities of predetermined pairs of a source device and a destination device between which matching logic will permit the transfer of data signals. The matching logic receives the bus request signals and de…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.