some question ahout RS Encoder and Decoder IP

some question ahout RS Encoder and Decoder IP

at the Reed-Solomon Compiler User Guide.pdf

https://www.alteraforum.com/forum/attachment.php?attachmentid=2034

what does above mean?

https://www.alteraforum.com/forum/attachment.php?attachmentid=2035

what is the use of the sink_ena ,can is assign sink_ena =1 sometimes ?

the sink_val must dealy a step of sink_ena

and if i input the sink_sop and sink_eop is fix

is the delay of the sink_sop and the source_sop fix?