Elliptic Curve Cryptography (ECC) over GF(2^163) HDL implementation by using three finit field cores you may check more details at my thesis http://ecommons.usask.ca/bitstream/handle/10388/etd-05032010-135617/Yu_thesis.pdf ecc_top_tb.v is the testbench top file for one usecase
it's been a while, and this is actually not my final version. I lost my hard drive, and only found this version somewhere. but it's getting very close...
please take a look ISA, ECC_ARCHITECT.xls
Highly recommend to use software Mathematica to do the check and debug.
If you have interest for commercial use, you can ping me as well