Cordic Functions

Hi,

I have been roped into doing some FPGA work (not my field)

I need to do implement the inverse TAN function

The Machlaren expansion is:

arctan(x) = x - x^3/3 + x^5/5 -x^7/7 + ...

not very practical

CORDAC function are suppose to do all trig calcuations in a digital world with just shifts and adds

anyone had any experience?/

I don't have any experience but I remember seeing a CORDIC core on OpenCores.com. Looks like they have one implemented in VHDL - certainly a good place to start looking.