完成8位移位寄存器的VHDL设计、仿真、下载验证，要求有带进位循环右移、带进位循环左移、自循环右移和自循环左移功能。-Completed the 8-bit shift register VHDL design, simulation, download authentication, and require Rotate right, Rotate left, since the rotate right and left from the circulation function.