As I try with the ALTERA_CORDIC IP -> Performance -> Check Performance, it seems like the IP does not work with the SIV part with -2X. I am not sure about the specific restriction for this with -2X speed grade device. As a workaround, it is recommended for you to choose other part with speed grade than -2X to proceed with the ALTERA_CORDIC IP. Sorry for the inconvenience.
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