Patent ID: 7940876
Filing Date: 2011-05-10
Classification: H03L,H04L

Abstract:
1. A frequency synchronizing apparatus for synchronizing a slave device with a start of frame (SOF) signal to mark a reference interval, comprising: a frequency divider, used to receive a high-frequency signal and divide the high-frequency signal by a variable frequency factor to obtain a lock frequency signal; a counter unit, having a default pulse number, for obtaining a currently detected deviation by calculating a difference between the default pulse number and a pulse number of the lock frequency signal during a current reference interval; an operating unit, used to generate an error adjusting value based on the currently detected deviation, wherein the operating unit includes: an adjusting unit, used to receive the error adjusting value and generate a proportional adjusting value, so that the frequency divider adjusts the variable frequency factor based on the error adjusting value at every proportional adjusting value of a next reference interval; wherein by adjusting the variable frequency factor, the slave device receives the lock frequency signal and synchronizes a frequency with a master device to which the slave device connects.