These errors occur when an energy level within the chip (for example, a one or a zero) changes, most often due to cosmic radiation. When referenced by the CPU, such errors cause the system to either crash (if the error is in an area that is not recoverable) or they recover other systems (for example, a CyBus complex restarts if the error was in the packet memory (MEMD)). In case of a soft parity error, there is no need to swap the board or any of the components.
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