VHDL小程序，其中包含了bcd码转换成格雷码、寄存器的简单设计（并入串出移位寄存器、串入串出移位寄存器）以及脉冲发生器的VHDL实现。适合于基础的VHDL入门。-VHDL small program, which includes a bcd code into Gray code, register for a simple design (String into a shift register, the string into the string out of the shift re