CE6313

Data Sheet

13

Intel Corporation

2.4.4

The Reed-Solomon Decoder Block

DVB and DSS data are encoded using shortened versions of the Reed-Solomon code of block length 255,

containing 239 message bytes and 16 check bytes, that is (255,239) with T = 8. Both encoders use the same

generator polynomial. The code block size for DVB is 204 and that for DSS is 146. Hence DVB code is (204, 188)

and DSS code is (146, 130), with both having T = 8. The block structure of the DVB and DSS Reed-Solomon codes

are as shown in Figure 10 and Figure 11 below.

The Reed-Solomon decoder can correct up to eight byte errors per packet. If there are more than eight bytes

containing errors, the packet is flagged as uncorrectable using the BKERR pin 63. In the case of DVB the Transport

Error Indicator (TEI) bit of the MPEG packet is set to 1, if setting of TEI is enabled.

Figure 10 - DVB Block Structure

Figure 11 - DVB Energy Dispersal Conceptual Diagram

Sync byte

187 bytes

16 check bytes

Reed-Solomon encoded block

Sync byte

187 bytes

MPEG transport packet

130 bytes

16 check bytes

Reed-Solomon encoded block

130 bytes

DSS transport packet