Triple modular redundant computer system - Patent Review 6240526

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Triple modular redundant computer system
United States Patent	6240526
Link to this page	http://www.wikipatents.com/6240526.html
Inventor(s)	Petivan; James L. (Palo Alto, CA); Lundell; Jonathan K. (Half Moon Bay, CA); Lundell; Don C. (Boulder Creek, CA)
Abstract	A fault tolerant computer system is provided which includes a first system module with a first processor and a first processor bus and a first I/O bus; a second system module with a second processor and a second processor bus and a second I/O bus; a third system module with a third processor and a third processor bus and a third I/O bus; wherein the first system module further includes a first control device which coordinates transfer of first transaction information between the first processor bus and each of the first I/O bus or the second I/O bus or the third I/O bus; and wherein the first system module includes first comparison logic which compares first transaction information with corresponding second transaction information; wherein the second system module further includes a second control device which coordinates transfer of second transaction information between the second processor bus and each of the first I/O bus or the second I/O bus or the third I/O bus; and wherein the second system module includes second comparison logic which compares second transaction information with corresponding third transaction information; wherein the third system module further includes a third control device which coordinates transfer of third transaction information between the third processor bus and each of the first I/O bus or the second I/O bus or the third I/O bus; and wherein the third system module includes third comparison logic which compares third transaction information with corresponding first transaction information; and transfer circuitry which transfers the first, second and third transaction information among the first, second and third system modules.

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