设计一检测电路，搜索帧同步码。要求在搜捕态能够正确地从数据流中提取帧同步码，在达到一定设计要求时进入稳定同步态。同时，要求帧同步检测电路具有一定的抗干扰能力，在稳定同步态发现帧失步次数超过设计要求时，系统要进入搜捕状态。-Design a detection circuit, the search frame synchronization code. Required to search state can correctly be extracted from the data stream frame synchronization code, in a certain design requirements into the stable synchronous state. Meanwhile, the frame synchronization detection circuit requires a certain anti-interference ability, found in the steady-state frame-of-step synchronization times more than the design requirements, the system to enter the hunt state.