TIMING ADJUSTMENT DEVICE, TIMING ADJUSTMENT CIRCUIT AND TIMING ADJUSTMENT METHOD

摘要

A frequency ratio detection circuit (10), in accordance with a clock signal of a circuit (2) which transmits a data signal, generates a pattern signal in which a clock signal value of a circuit (3) which receives the data signal has been latched. In addition, the frequency ratio detection circuit (10), using the clock signal of the circuit (2) as a criterion, detects the period of the generated pattern signal. In addition, a frequency ratio detection circuit (20), in accordance with the clock signal of the circuit (3), generates a second pattern signal in which a clock signal value of the circuit (2) has been latched. In addition, the frequency ratio detection circuit (20), using the clock signal of the circuit (3) as a criterion, detects the period of the second pattern signal. Then, a timing adjustment circuit (5), using the ratio of each of the periods detected by the frequency ratio detection circuit (10) and the frequency ratio detection circuit (20), adjusts the frequency of the data signal.