This is easily accomplished with NOT gates, and a 7 bit shift register.
这是用非门和7位的移位寄存器很容易实现。
It is called a shift register because the data is shifted through the register by one bit position on each clock pulse.
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。
Four-bit bidirectional shift register was used to produce the device for demonstrating the direction of direct current.
利用四位双向移位寄存器等电子元件可制作能直观显示直流电流方向的模拟演示仪。
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