Importance

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Abstract

A transmission device includes: a write pointer controller that generates a write pointer by using a write clock recovered from a data signal; a read clock generator that generates a read clock; a read pointer controller that generates a read pointer by using the read clock; a memory in which the data signal is written to a bit specified by the write pointer, and the data signal is read from a bit specified by the read pointer; a detector that detects a usage rate of the memory according to a difference between the write pointer and the read pointer and; a frequency controller that generates a frequency control signal that changes a frequency of the read clock when the usage rate is out of a specified allowable range. The read clock generator controls the frequency of the read clock according to the frequency control signal.

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First Claim