这种设计是一个普遍的登记册可作为一个简单的存储登记，双向移位寄存器，计数器的行动和反跌。登记册可以载入了一套并行数据输入和模式是由3位输入。-This design is a universal register which can be used as a straightforward storage register, a bi-directional shift register, an up counter and a down counter. The register can be