是codic算法实现atan的virilog程序，模块结构如下：Core Structure: sc_corproc.vhd->p2r_cordic.vhd->p2r_cordicpipe.vhd-Atan is the codic algorithm virilog procedures, module is structured as follows: Core Structure: sc_corproc.vhd-> p2r_cordic.vhd-> p2r_cord