文件名称:tongbu
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1、搜索出数据流中的帧同步字信号，并给出帧同步标志。
2、系统工作开始后，要连续3次确认帧同步字进入锁定状态后才输出帧同步标志。
3、在锁定状态时，如连续出现3次错误的帧同步字，则帧同步标志输出无效，系统重新进入搜索状态；否则继续输出有效的帧同步标志。
-1, the search for the data stream signal in the fr a me synchronization word and fr a me synchronization flag is given. 2, the system works after the start of 3 consecutive times to confirm the fr a me synchronization word into the locked state after the output fr a me sync flag. 3, in the locked state, such as 3 consecutive incorrect fr a me synchronization word, the output fr a me sync flag is invalid, the system re-entering the search state otherwise continue to output a valid fr a me sync flag.
2、系统工作开始后，要连续3次确认帧同步字进入锁定状态后才输出帧同步标志。
3、在锁定状态时，如连续出现3次错误的帧同步字，则帧同步标志输出无效，系统重新进入搜索状态；否则继续输出有效的帧同步标志。
-1, the search for the data stream signal in the fr a me synchronization word and fr a me synchronization flag is given. 2, the system works after the start of 3 consecutive times to confirm the fr a me synchronization word into the locked state after the output fr a me sync flag. 3, in the locked state, such as 3 consecutive incorrect fr a me synchronization word, the output fr a me sync flag is invalid, the system re-entering the search state otherwise continue to output a valid fr a me sync flag.
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