CONTROL SIGNAL GENERATING CIRCUIT ENABLING VALUE OF PERIOD OF A GENERATED CLOCK SIGNAL TO BE SET AS THE PERIOD OF A REFERENCE SIGNAL MULTIPLIED OR DIVIDED BY AN ARBITRARY REAL NUMBER

摘要

A pulse signal circulates around a ring of delay elements with respective traversal signals being thereby successively outputted from the delay elements. The period of a reference signal is multiplied or divided by a real number to obtain control data specifying a required period of a clock signal as a value having an integer part and a fractional part. The control data are used to select the timings of specific traversal signal, and the clock signal is generated based these selected timings, with the timing selection being repetitively adjusted in accordance with the fractional part of the control data.