Dynamic Block Reed-Solomon Encoder

Overview

Reed-Solomon codes are used to perform Forward Error Correction (FEC). FEC introduces controlled redundancy in the data before it is transmitted to allow error correction at the receiver. The redundant data (check symbols) are transmitted with the original data to the receiver. A Reed-Solomon Decoder is used in the receiver to correct any transmission errors. This type of error correction is widely used in data communications applications such as Digital Video Broadcast (DVB) and Optical Carriers (i.e. OC-192).

Reed-Solomon codes are written in the format RS(n,k) where k is the number of information symbols and n is the total number of symbols in a codeword or block. Each symbol in the codeword is wsymb bits wide. The first k symbols in the Reed-Solomon Encoder output are information symbols and the last n-k symbols are check symbols.  This type of encoder, where the information symbols are unchanged and are followed by check symbols in the output, is called a systematic encoder.  The figure below illustrates the operation of a systematic encoder.

Features 3- to 12-bit Symbol Width Configurable Field Polynomial Configurable Generator Polynomial: Starting Root and Root Spacing User-defined Codewords Maximum of 4095 symbols Maximum of 256 check symbols Shortened codes Selectable Reed-Solomon Standards OC-192 DVB CCSDS ATSC IEEE 802.16-2004 WirelessMAN-SCa/OFDM IEEE 802.16-2004 WirelessMAN-SC Fully Synchronous Registered Input Selection Systematic Encoder Full Handshaking Capability Dynamically Variable Block Size Dynamically Variable Check Symbols Dynamically Variable Check Symbols Puncturing

Performance and Resource Utilization

1. Performance and utilization data are generated using an LFE3-95E-8FN484CES device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP3 family.

1. Performance and utilization data are generated using an LFE2M35E/SE-7F484C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2M and LatticeECP2MS families.

1. Performance and utilization data are generated using an LFE2-50E/SE-7F484C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP2S family.

1. Performance and utilization data are generated using an LFEC/P20E-5F672C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeECP/EC family.

1. Performance and utilization data are generated using an LFSC/M3GA25E-7F900C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeSCM family.

1. Performance and utilization data are generated using an LFXP2-17E-7FT256C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeXP2 family.

1. Performance and utilization data are generated using an LFXP20E-5F256C device with Lattice Diamond 1.0 and Synplify Pro D-2009.12L-1 software. Performance may vary when using a different software version or targeting a different device density or speed grade within the LatticeXP family.

Ordering Information

IP Version: 4.4
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