| 摘要 |
PROBLEM TO BE SOLVED: To provide a synchronization system that prevents the occurrence of a timing violation due to a clock skew between a frequency division circuit and a first device.SOLUTION: The synchronization system includes: the frequency division circuit for frequency-dividing a reference clock by a first frequency division ratio set by a frequency division ratio setting signal to generate a frequency-divided clock; the first device, which operates in synchronization with the reference clock; a second device that operates in synchronization with the frequency-divided clock; a frequency division ratio detection circuit for, at every single period of the frequency-divided clock, outputting a count value counted in synchronization with the reference clock and, on the basis of the count value, detecting a frequency division ratio of the frequency-divided clock to be output as a second frequency division ratio; and a decoder for generating strobe signals to control timings when the first device inputs/outputs signals from/to the second device, on the basis of the count value and the second frequency division ratio. The first device communicates with the second device via a bus that operates in synchronization with the frequency-divided clock, on the basis of the strobe signals. |
