Method and apparatus for detecting handshaking protocol errors on an asynchronous data bus
US6389568B1 · kind B1 · utility
6Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A circuit for monitoring and detecting data transfer protocol errors that occur during asynchronous transfer of data over a data bus. The circuit monitors bus request/acknowledge control lines in accordance with a predetermined handshaking protocol. In the event that an undefined or illegal logic state is detected on the data bus request or acknowledge control lines, the circuit provides an error value to the data sending entity. As a result of receiving this error value, the data sending entity can retry the data transmission over data bus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.