一个4比特移位寄存器,活跃在不断上升的边缘的时钟。登记应能转移左、右移,接受连续剧和平行(负荷)输入,而有一个异步预设(“1111”)和清晰的(“0000”)的能力。-a 4-bit shift register which is active on the rising edge of the clock. The register should be able to shift left, shift right, accept a serial and parallel (load) i