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Arcsine - Cordic Method Question

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analog_fever

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I am trying to implement Arcsine function using CORDIC methods. I am following the method given in "A surevey of CORDIC algorithms for FPGA based computers" by Ray Andraka. (paper attached).

For the method described, I tried using x0 = 1 (since the paper says we start with a unit vector on x axis), y0 = 0, and z0 = 0. I am getting an incorrect result.

Can somebody correct me?

Also, should there be a "+" in the Z equation, instead of "-"?
 

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