利用VHDL编写ln(1+x)这样的特殊函数逼近程序，采用Quartus 仿真-Writing the ln (1+x) special function approximation procedures using VHDL simulation with Quartus

vhdl写的自然对数计算，通过cordic迭代出的结果。提高精度需要增加迭代次数。-write vhdl natural logarithm, cordic iterate through the results. Improve the accuracy of the need to increase the number of iterations.