采用FPGA设计了一种基于同步状态机的帧同步检测电路，具有帧同步的前方保护和后方保护以及接收端的定时功能。
A frame synchronization detect circuit is designed based on the synchronization state machine using FPGA, and this circuit has functions of pre-protect, rear-protect and timing of the receiver.
从实用的角度来看，这保护了雕像，让它们不破裂，并在心理上赋予形象一种强壮有力的感觉，这种感觉通常又被一个在后方支撑的柱子加强。
From a practical aspect this protected the figures against breakage and psychologically gives the images a sense of strength and power, usually enhanced by a supporting back pillar.
为了保护大后方的亲人朋友——同时可能也享有他们坚定不移的支持——的作战观念已经成为明日黄花。
The notion of fighting to protect kith and kin on the home front-and perhaps also enjoying their undivided support-has become a thing of the past.
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