L64724 LSI Logic Corporation, L64724 Datasheet - Page 184

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

7.3.2 Features
7-14
Assume that the byte size is 8, the redundant check parameter is 32, and
a 122-bit burst error is input to the RS decoder. The RS decoder can
correct up to T = 16 byte errors. A 122-bit burst can be divided into
17 bytes as shown in
Because the redundancy is 32, the decoder corrects up to 16 byte errors.
Because the 122-bit burst corrupts 17 consecutive bytes, the maximum
guaranteed correctable burst length in this example is 121 bits.
Figure 7.9
The FEC Decoder Pipeline
Flag for corrected errors
Complies with CCITT-recommended CCIR723 standard for digital TV
transmission
DVB/DSS compliant
Decoder channel output counts for uncorrected data and error vector
data
ERROROUTn signal flags uncorrectable errors
(204, 188) Reed-Solomon Code Format for DVB
(146, 130) Reed-Solomon Code Format for DSS
e e e e e e e e e . . . . . .
122-Bit Burst Example
1 Byte
Figure
7.9, where each e represents a one bit error.
17 Bytes
122 Bits
e e e e e e e e