用VHDL写的硬件乘法器，以及测试过了，一个时钟周期内完成乘法运算。被乘数、乘数的宽度通过通用属性GENERIC参数改变而轻松改变，硬件除法器也快好了。-Written by VHDL hardware multiplier, and tested, and a clock cycle multiplication. Multiplicand, multiplier width parameter changes through the common property of GENERIC an