Simultaneous resynchronization by command for state machines in redundant systems
US6470462B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1999 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Feb 25, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/142
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A redundant system (20) comprises a first unit (21), a second unit (22), and a synchronization server (24). The first unit (21) and a second unit (22) each include plural state machines (SMs) for performing tasks. At least some of the state machines provided at the first unit simultaneously perform same tasks as at least corresponding ones of some of the state machines provided at the second unit. When a state machine of the second unit needs to be resynchronized, the synchronization server (24) receives a resynchronization request (2-1) from the resync requesting state machine of the second unit and thereupon provides an out-of-synchronization indication (2-2) to a corresponding state machine of the first unit. In response to the out-of-synchronization indication (2-2) from the synchronization server, the corresponding state machine of the first unit generates a resynchronization request (2-3) at an time deemed appropriate by the corresponding state machine. In response to the resynchronization request (2-3) from the corresponding state machine, the synchronization server issues a resynchronization command (2-4) to both the resync requesting state machine of the second unit and th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.