Fault-tolerant computer system having switchable I/O bus interfa

Details Fault-tolerant computer system having switchable I/O bus interfa Fault-tolerant computer system having switchable I/O bus interfa

1995-01-31

1996-12-24

Beausoliel, Jr., Robert W.

39518204, 39518208, G06F 1100

Patent

active

055881114

ABSTRACT:
A computer system in a fault-tolerant configuration employs multiple identical CPUs executing the same instruction stream, with multiple, identical memory modules in the address space of the CPUs storing duplicates of the same data. The multiple CPUs are loosely synchronized, as by detecting events such as memory references and stalling any CPU ahead of others until all execute the function simultaneously; interrupts can be synchronized by ensuring that all CPUs implement the interrupt at the same point in their instruction stream. I/O devices are accessed through a pair of identical (redundant) I/O processors, but only one is designated to actively control a given device; in case of failure of one I/O processor, however, an I/O device can be accessed by the other one without system shutdown, i.e., by merely redesignating the addresses of the registers of the I/O device under instruction control.

REFERENCES:
patent: 4375683 (1983-03-01), Wensley
patent: 4455605 (1984-06-01), Cormier et al.
patent: 4564903 (1986-01-01), Guyette et al.
patent: 4577272 (1986-03-01), Ballew et al.
patent: 4672535 (1987-06-01), Katzman et al.
patent: 4920540 (1990-04-01), Baty
patent: 4965717 (1990-10-01), Cutts, Jr. et al.
patent: 5146589 (1992-09-01), Peet, Jr. et al.
patent: 5276823 (1994-01-01), Cutts, Jr. et al.
Yashwant K. Malaiya and Stephen Y. H. Su; "Fault Tolerance in Multiple Processor System"; IEEE; May 80; pp. 710-716.
John H. Wensley; "Fault tolerant Computers Ensure Reliable Industrial Controls"; Electronic Design, Jun. 25, 1981; pp. 129-135.
John H. Wensley; "Fault-Tolerant Computers Industrial-Control System does Things in Three for Safety"; Electronics; Jan. 27, 1983; pp. 98-102.

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