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Abstract

An elastic buffer circuit uses codes having a predetermined number of bits and a Hamming distance of 1 when adjacent memory elements are designated. The codes contain a common code in which bits other than, one bit of the code each adjacent memory element are the same. The elastic buffer includes a plurality of memory elements for storing data and then outputting the data. A writing designation means generates writing position coded for successively designating the memory element in cycles when data is stored in the memory element in synchronism with a first clock pulse using the code. A reading designation means generates a reading position code for successively designating the memory element in cycles using the codes when data is read out from the memory element in synchronism with a second clock pulse. An error detection circuit detects an occurrence of an over-flow error or an under-flow error when the common code of the memory element designated by the reading position code is the same as the common code of the memory element designated by the writing position code.

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First Claim