按照逻辑芯片设计特点，将芯片工作时的信号分为4种：时钟信号、输入信号、组合输出信号和寄存器输出信号。
According to the logic chip design feature, the chip work's time signal can be divided into 4 kinds: clock signal, input signal, combination output signal and register output signal.
这就是移位寄存器，因为数据在每一个时钟脉冲的作用下通过寄存器会移动一位。
It is called a shift register because the data is shifted through the register by one bit position on each clock pulse.
在通信协议中，主要实现了双向数据缓冲器、数据移位寄存器、时钟控制电路以及奇偶校验等功能。
The protocol realized some functions, such as two-way data buffer, shift register, clock circuit and parity check.
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