Electronic module with redundant architecture for fault tolerant operation

摘要

The electronic module for a computer rack has two processors (MP1,MP2) working in redundant but non-synchronous mode. Control circuits (CS1,CS2) synchronise the outcome of certain tasks are in agreement. The tasks are brought into synchronism by delaying the result of the first task to finish. The control circuits detect commencement of execution of the specified tasks, and initiate a timer when the task has been started by one of the processors. The task is blocked on the first processor until it is started by the second processor. The address, data and control buses of the processors are compared to determine whether there has been an error.