Information system using error syndrome for special control
US4466099A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1981 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | Dec 20, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/19
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Special control within a data processing system is signalled by a predetermined unique combination of data and error correcting code (ECC) bits. The predetermined combination, received from a source 1, is one which normally is decoded to indicate the presence of an uncorrectable error. A comparator 3 compares data bits held in a register 5 with a reference pattern of data bits held in a storage medium 7. At the same time, a syndrome generator 9 generates a syndrome from the received word, which syndrome is decoded by a syndrome decoder 11. If a particular flag syndrome sf (which is selected from the syndromes normally indicating the existence of an uncorrectable error) is detected, and comparator 3 indicates an equal comparison, AND 13 will provide a signal indicating that the unique combination has been received. It will also, through inverter 15 and AND 17 block transmission of an error indication to the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.