Reed Solomon IPcore 13.0 problem

Hi kaz, thank you very much for your reply.

I forgot myself to include the backpressure control in that code. Now I'm using the sink_enable signal to stop the data stream when the Encoder is not able to receive more data. This way it should be reasonably good, in fact the RS compiler guide says: "By de-asserting sink_ena, the encoder signals that it cannot sink more incoming symbols after sink_eop is signalled at the input. During this time it is generating the check symbols for the current codeword." However it doesn't work, as before. I post the corrected code:

module avalon_st_interface(
input clk,res,
input valid,
input  data_in,
input sink_en, 
output reg sop,eop,source_val, 
output reg source_en, 
output reg  data_out,
output reg  count
);
reg valid_mem;
always@(posedge clk)begin source_en<=sink_en;end 
always@(posedge clk)begin data_out<=data_in;end
always@(posedge clk)begin valid_mem<=valid;end
always@(posedge clk or posedge res)
begin
	if(res)
		begin
			count<=9'd0;
			sop<=1'd0;
			eop<=1'd0;
			source_val<=1'd0;			
		end
	else
		begin
			if(sink_en)
				begin
					if(!valid_mem & valid & count==9'd0)
						begin
							count<=9'd1; 
							sop<=1'd1;
							eop<=1'd0;
							source_val<=1'd1;
						end
					else if(valid & count==9'd222)
						begin
							count<=count + 9'd1;
							sop<=1'd0;
							eop<=1'd1;
							source_val<=1'd1;
						end
					else if(valid & count==9'd223) 
						begin
							count<=9'd1;
							sop<=1'd1;
							eop<=1'd0;
							source_val<=1'd1;
						end
					else if(valid & count>=9'd0 & count<=9'd222) 
						begin
							count<=count + 9'd1;
							sop<=1'd0;
							eop<=1'd0;
							source_val<=1'd1;
						end
					else if(!valid & count>=9'd0 & count<=9'd222) 
						begin
							count<=count;
							sop<=1'd0;
							eop<=1'd0;
							source_val<=1'd0;
						end
					else if(!valid & (count==9'd0 | count==9'd223)) //idle
						begin
							count<=9'd0;
							sop<=1'd0;
							eop<=1'd0;
							source_val<=1'd0;
						end
					else
						begin
							count<=9'd0;
							sop<=1'd0;
							eop<=1'd0;
							source_val<=1'd0;
						end
				end
			else //backpressure on
				begin
							count<=count;
							sop<=1'd0;
							eop<=1'd0;
							source_val<=1'd0;					
				end
			end
end
endmodule