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系统研究了Ｄｙｎｋｉｎ 型反馈移位寄存器，给出了ｎ 长码是Ａｎ 型Ｄｙｎｋｉｎ 反馈函数的周期码的充分必要条件，从而得出了所有周期码及其周期．
The Dynkin type feedback shift register is studied systematically, and the necessary and sufficient conditions for the periodic codes with n-long codes to be An-type Dynkin feedback functions are given. All the periodic codes and their periods are obtained.