about missing sop？

[Altera_Forum]

now，I want to implement FFT core function，but the source_error's value is “01” or “10”，and the datasheet talk that “01” delegate missing sop and “10” delegate unexpected eoc. however,what is the missing sop and  

unexpected eop? anyone understand them or your meet the same problems？

[Altera_Forum]

SOP is Start Of Packet and EOP is End Of Packet, they are control signals ofr the FFT Megacore. Check that these signals are managed correctly.