Frame synchronization method and frame synchronization circuit

摘要

A frame synchronization circuit has a frame synchronization pattern detecting circuit for detecting a frame synchronization pattern from received frame data and for outputting a pattern detection signal; a frame synchronization state transition managing circuit for managing state transitions; and a frame timing generation circuit for detecting a transition from a hunting state and for generating an enable signal. The frame synchronization state transition managing circuit manages the number of times a frame synchronization pattern is and is not detected, and makes a transition from the hunting state to a synchronization state if the frame synchronization pattern is detected consecutively for a backward protection stage count, and makes a transition from the synchronization state to the hunting state if the frame synchronization pattern is not detected consecutively for a forward protection stage count.