Data processing device, which has redundant chip sets and serial controllers for controlling serial data exchange, has a maintenance processor that oversees their operation, with data is sent to either or both dependent on state

摘要

Data processing system has a processor (1) and an input-output device together with two chip sets for serial connection of the processor to the I-O device. A maintenance processor is configured to monitor and control the connection between the CPU and the I-O device. Thus if both chip sets are functioning correctly, input and output data are supplied to both chip sets, while if either is not working correctly, input and or output data is only supplied to the chip set that is operating correctly.