G - Physics – 06 – F
Patent
G - Physics
06
F
354/222
G06F 11/20 (2006.01) G06F 11/00 (2006.01) G06F 11/16 (2006.01)
Patent
CA 1232688
- 1 - Abstract: A dual processor system with duplicated memory has two modes of operation: a converged mode in which one of the two processors is active and executing all system tasks while the other processor is inactive; and a diverged mode in which both processors are active and independently executing different tasks. The system automatically changes modes in response to requests such as manual and program control and certain system fault conditions. In diverged mode, the system may be in either of two states of operation. In one state one processor is designated a primary processor, and in the other state the other processor is designated the primary processor. In the converged mode the system may be in either of four states of operation. In two of these states one processor is active while the other processor is standing by ready to take up execution of tasks from the point where the one processor stopped execution. In the other two of these states one processor is active while the other processor is out of service and cannot take up task execution with- out being initialized. The system 100 makes transitions between the various states in response to requests. Except for transitions of an active processor to an out-of-service condition, the state transitions are transparent to tasks other than fault recovery programs and, upon a fault condition, the faulted program.
482564
Bishop Thomas P.
Butvila Jonas
Fitch David J.
Hansen Robert C.
Schmitt David A.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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