A reconfigurable real-time RISC computer system

The hardware architecture of a modular redundant and reconfigurable RISC- (reduced-instruction-set-computer) based fault-tolerant computer system that meets the high availability requirements of real-time applications is presented. A range of redundancy levels is available, and these levels can be defined by the user during the initial or any subsequent system configuration process. Fail-operational capabilities are provided for processor, memory, internal bus, I/O, and power source subsystem failures, and an optional uninterruptible power supply is available. The system protects both stored and output data from corruption upon failures, and the system´s fault tolerance and redundancy are transparent to the user. Overall, the fault-tolerance functions are closely integrated with diagnostic software to facilitate system maintenance and repair