Patent ID: 7283601

Claim:
A timing signal generating system comprising: a clock signal generating circuit generating at least one first clock signal upon receipt of at least one reference clock signal by controlling an output phase thereof with a digital code signal; a synchronizing circuit handing over signals between a group of circuits operated by said first clock signal and an internal circuit operated by a second clock signal; a phase code recognizing circuit recognizing a phase code when the phases of said first clock signal and of said second clock signal are in a particular relationship; and a calibration circuit calibrating a relationship between a value of said recognized phase code and a phase difference between said first and second clock signals, wherein said synchronizing circuit is controlled by using phase code data calibrated by said calibration circuit, wherein the phase code data from said calibration circuit and the phase difference between the first and second clock signals, are calibrated at the time of closing a power source circuit of an apparatus equipped with said timing signal generating system.