US Patent 7350026 Memory based cross compare for cross checked systems

A cross compare solution running in a multiprocessor configuration, using a multi-port RAM with built-in logic. This provides for a fast and simple data cross compare medium. The multi-port RAM unit can be plugged into the motherboard of the main processor unit, requiring no external hardware or wiring. A method and a system for cross compare has a first layer of buffers with a first storage area for storing information from the first processor and a second storage area for storing information from the second processor, and a second layer of buffers with a third and fourth storage areas, where each storage area stores information from the first and second storage areas. The first, second, third, and fourth storage areas have one or more buffers allocated only for its respective storage area.