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Abstract

A distributed XOR device that preferably includes a data buffer. The data buffer preferably stores at least two data blocks in an interleaved manner. The data blocks contain data words, and a specific data word for each data block contains CRC bits. In response to certain addresses, the data words of the data blocks are output from the data buffer in an interleaved manner. An XOR engine circuit receives the interleaved data words. The XOR engine circuit preferably includes a data XOR circuit and an error detection circuit. The data XOR circuit preferably performs an exclusive-OR function on pairs of data words, where one data word is from a one data block and the other data word in from the other data block. The generated combinations or results are output to the error detection circuit. The error detection circuit generates CRC bits from the generated combinations or results. Preferably, the CRC bits are encoded with a constant ID.sub.CRC. These encoded CRC bits are compared to the result of the exclusive-OR function on the CRC bits of the data blocks. If these bits are not equal, an error signal is output. The comparison therefore checks whether the XOR engine circuit or the data blocks are in error.

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