求5~85度的sin和cos值
其它角度和Verilog实现代码类似，查表、移位和加法器

`define     DIE    16          //迭代次数 
`define     PIE    3.1415926  
`define     MUL    100_000_000 //同比放大
initial begin  
int die;  
int x[17];  
int y[17];  
int z[17];  
int tan[16] =`{78539816,46364760,24497866,12435499,6241881,3123983,1562372,781234,390623,195312,97656,48828,24414,12207,6104,3052};  
int d;  
int angle;        //角度值
int cosz0,sinz0;  
#100;  
x[0] =(0.607253*`MUL);  
z[0] =(`PIE*`MUL/4);  
$display("x[0] = %0d;z[0] = %0d,tan[0]",x[0],z[0],tan[0]) ;  
  for(angle = 5;angle <= 85;angle++)  
  begin  
    z[0] = angle*2*(`MUL*`PIE)/360;   //转成弧度后作为初始角度
    for(die =0;die<`DIE;die++)begin  
        @(posedge clk) ;  
        if(z[die] >= 0)begin  
            d = 1;  
        end  
        else begin  
            d = -l;  
        end  
        x[die+1]= x[die] - d*((y[die]) >> die );  
        y[die+1]= y[die] + d*((x[die]) >> die );  
        z[die+1]= z[die] - d*tan[die];  
      end  
      cosz0 = x[16];  
      sinz0 = y[16];  
   end  
end

参考：https://blog.csdn.net/Pieces_thinking/article/details/83512820