AUTOMATIC CALIBRATION TYPE CLOCK SYNTHESIZER

摘要

PURPOSE: To maintain a synchronous state for a long time by tracing a reference signal regardless of temperature, voltage and process fluctuations and therefore generating plural clock signals which synchronize with a reference clock. CONSTITUTION: A processor unit 12 which operates in response to clock signals that are given from a clock generator 14 generates various control signals which are sent to a control/controlled logic 18 via a multiple signal line bus 16. On the other hand, the unit 12 generates a periodic clock signal (SYSOUT) and sends it to a clock synchronizer 20 as a reference system clock. The synchronizer 20 receives the clock signal from the generator 14 and generates many clock signals (SYSCLK-OUT) serving as the synchronous replicas of the SYSOUT. These clock signals are sent to the logic 18 and perform the clocking and synchronous functions of a circuit which is included in the logic 18.