Computer memory systems when exposed to strong electromagnetic waves or radiation are highly vulnerable to multiple random bit errors. Under this situation, we cannot apply existing SEC-DED or S{sub}bEC capable codes because they provide insufficient error control performance. This correspondence considers the situation where two random bits in a memory chip are corrupted by strong electromagnetic waves or radioactive particles and proposes two classes of codes that are capable of correcting random double bit errors occurring within a chip. The proposed codes, called Double bit within a block Error Correcting -Single byte Error Detecting ((DEC){sub}B-S{sub}bED) code and Double bit within a block Error Correcting -Single byte Error Canceling ((DEC){sub}B-S{sub}bEC code, are suitable for recent computer memory systems.
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