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Answers to Questions in Xilinx Reed-Solomon Tutorial 2


Q1. ready should go low for 87 symbol periods i.e. (Processing Delay - n) = 294-207 = 87.
Q2. As Q1.
Q3.  Latency = 507 symbol periods i.e. 10140/20
Q4. err_cnt = 10, as 10 errors were added to each code word in Tutorial 1.
Q5. No. There are now 11 errors in the first code word but the decoder can only detect and correct 10 i.e. (n-k)/2.
Q6. No. The decoder can only reliably detect up to 10 errors in a code word (unless erasure support is added and known errors are flagged).
Q7. The fail signal should be used to check whether the decoder has successfully decoded a code word.
Q8. Yes, the decoder will be able to accept continuous input data because Processing Delay is now less than n.
Q9. The ready signal is always high because the decoder can accept continuous input data now that Processing Delay is less than n.
Q10. Latency = 360 symbol periods i.e. 14400/40. Note that a symbol period is now two clock cycle periods (2*20 ns).