Method and apparatus for communicating between master and slave electronic devices where the slave device may be hazardous
US5717931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1994 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Dec 20, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/1605
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A master device (11) can access slave devices (12) either speculatively or non-speculatively. The slave devices (12) can be either non-hazardous devices or hazardous devices which exhibit status changes on reading. The master device (11) issues an access request including information as to whether the request is speculative or non-speculative, the slave device (12) then responds to the master device (11) with a negative acknowledgment that access is denied if the access request is speculative and the slave device (12) is hazardous. Otherwise, if the slave device (12) can deal with the request, a positive acknowledgment is sent. If the master device (11) receives a negative acknowledgment, it continues to reissue updated access requests until a positive acknowledgment is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.