The CMS0018 J.83abc/DVB-C Cable FEC Decoder combines all of the channel coding and Forward Error Correction functions specified by DVB-C and by J83 – Annexes A B and C
The CMS0018 includes functions for QAM constellation slicing, trellis decoding, de-framing, de-scrambling, de-interleaving, and Reed-Solomon decoding.
With the exception of the common de-interleaver block, two independent datapaths are required. J83A J83C and DVB-C are quite similar in requirements. These are implemented in the DEC_A sub-block
The requirements of J83 Annex B are significantly different. The largest difference is the addition of trellis coding, but the Reed-Solomon code is also uniquely different and the scrambler is based on a different algorithm. In practice, only the de interleave block may be easily shared between them.
