Decoder IP problem

[Altera_Forum]

HI,  

I want to know how to do with that problem in the decoder IP ( Reed Solomon and Viterbi), it is the same problem. "all the output are zero ". can anyone help me please? I am really in a big trouble

[Altera_Forum]

I know that this may be late for you lolitta73, however it may be useful for future visitors. 

Recently I have had the same behavior and the problem was that at one point (normally few seconds after starting decoding process) I was sending into the module two consecutive StartOfFrame signals without EndOfFrame signalling in between. And now you can use SignalTap in order to scope the problem! ;)