Reed Solomon IPcore 13.0 problem

You are still not doing it right. your counter goes from 1 to 223, that is ok but then it becomes 1 and sop of second packet is generated without check on back pressure.

You better run your counter freely on valid from 0 to 254 starting 0 at start of valid. You need to stop your input data and valid at counts 223~255.

that way you don't need to use back pressure. your sop will be at count 0 & valid while your eop will be at count 222 & vaild.