Dynamic Block Reed-Solomon Decoder

IP ExpressReed-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 Broadcasting (DVB) and Optical Carriers (i.e. OC-192).

Lattice’s Dynamic Block Reed-Solomon Decoder IP is compliant with several industry standards including the more recent IEEE 802.16-2004 and can be custom configured to support other non-standard applications as well. The Decoder supports a wide range of symbol widths and allows the user to define the field polynomial, generator polynomial and several other parameters. The newer standards like IEEE 802.16-2004 require the use of Reed-Solomon codes with dynamically varying block sizes. Lattice’s Dynamic Block Reed-Solomon Decoder core provides an ideal solution that meets such needs of today’s forward error correction world. This core allows the block size and number of check symbols to be varied dynamically through input ports. This IP core can be used with Lattice’s Dynamic Block Reed-Solomon Encoder for a complete Reed-Solomon code based forward error correction application.

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 Reed-Solomon Decoder performs detection and correction of encoded data available at the receiver after demodulation. The RS encoded data is then processed to determine whether any errors have occurred during transmission. Once the number of errors is determined, the decoder decides if they are within the range of correction. After determining this, the decoder corrects the errors in the received data. The figure below illustrates the operation of a Reed-Solomon Decoder.

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
  • Support of the following communication standards
    • OC-192
    • DVB
    • CCSDS
    • ATSC
    • IEEE 802.16-2004 WirelessMAN-SCa/OFDM
    • IEEE 802.16-2004 WirelessMAN-SC
  • Fully Synchronous
  • Systematic Decoder
  • Full Handshaking Capability
  • Dynamically Variable Block size
  • Dynamically Variable Check Symbols
  • Error, Erasure, and Puncturing modes
  • Error Measurement information

Jump to

Block Diagram

Performance and Size

LatticeECP31
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 564 1062 791 2 37 148
CCSDS 990 1884 1322 2 38 149
DVB 591 1123 792 2 37 156
ATSC 776 1476 960 2 37 144
IEEE 802.16-2004 WirelessMAN SCa 912 1746 1252 2 51 145
IEEE 802.16-2004 WirelessMAN SC 1067 2031 1493 2 52 142

1. Performance and utilization data are generated using an LFE3-95E-8FN672CES device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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.

LatticeECP2M1
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 562 1117 791 2 37 169
CCSDS 963 1917 1322 2 38 163
DVB 591 1173 792 2 37 178
ATSC 756 1500 960 2 37 160
IEEE 802.16-2004 WirelessMAN SCa 917 1818 1252 3 51 151
IEEE 802.16-2004 WirelessMAN SC 1037 2056 1493 3 52 145

1. Performance and utilization data are generated using an LFE2M35E/SE-7F484C device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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/S family.

LatticeECP21
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 562 1117 791 2 37 175
CCSDS 963 1917 1322 2 38 157
DVB 591 1173 792 2 37 150
ATSC 756 1500 960 2 37 166
IEEE 802.16-2004 WirelessMAN SCa 917 1818 1252 3 51 152
IEEE 802.16-2004 WirelessMAN SC 1037 2056 1493 3 52 137

1. Performance and utilization data are generated using an LFE2-50E/S-7F672C device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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 LatticeECP2/S family.

LatticeECP/EC1
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 588 1171 795 2 37 123
CCSDS 980 1947 1349 2 38 114
DVB 604 1196 802 2 37 124
ATSC 766 1520 969 2 37 113
IEEE 802.16-2004 WirelessMAN SCa 927 1835 1279 3 51 116
IEEE 802.16-2004 WirelessMAN SC 1044 2066 1486 3 52 104

1. Performance and utilization data are generated using an LFEC/P20E-5F672C device with Lattice Diamond 1.0 and Synplify Pro for Lattice 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.

LatticeSC/M1
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 591 1113 803 2 37 267
CCSDS 1033 1958 1348 2 38 245
DVB 642 1219 804 2 37 287
ATSC 804 1537 970 2 37 253
IEEE 802.16-2004 WirelessMAN SCa 965 1833 1276 2 51 240
IEEE 802.16-2004 WirelessMAN SC 1107 2101 1501 2 52 238

1. Performance and utilization data are generated using an LFSC/M3GA25E-7F900C device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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 LatticeSC/M family.

LatticeXP21
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 562 1117 791 2 37 140
CCSDS 963 1917 1322 2 38 128
DVB 591 1173 792 2 37 157
ATSC 756 1500 960 2 37 128
IEEE 802.16-2004 WirelessMAN SCa 917 1818 1252 2 51 126
IEEE 802.16-2004 WirelessMAN SC 1037 2056 1493 2 52 127

1. Performance and utilization data are generated using an LFXP2-30E-7F484C device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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.

LatticeXP1
IPexpress User-Configurable Mode SLICEs LUTs Registers sysMEM EBRs I/Os fMAX (MHz)
OC-192 588 1171 795 2 37 110
CCSDS 980 1947 1349 2 38 108
DVB 604 1196 802 2 37 111
ATSC 766 1520 969 2 37 103
IEEE 802.16-2004 WirelessMAN SCa 928 1837 1279 2 51 109
IEEE 802.16-2004 WirelessMAN SC 1044 2066 1486 2 52 85

1. Performance and utilization data are generated using an LFXP20E-5F484C device with with Lattice Diamond 1.0 and Synplify Pro for Lattice 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

Family Part Number
LatticeECP3 RSDEC-DBLK-E3-U3
LatticeECP2M RSDEC-DBLK-PM-U3
LatticeECP2 RSDEC-DBLK-P2-U3
LatticeECP/EC RSDEC-DBLK-E2-U3
LatticeSC/M RSDEC-DBLK-SC-U3
LatticeXP2 RSDEC-DBLK-X2-U3
LatticeXP RSDEC-DBLK-XM-U3

IP Express Version: 3.4

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Documentation

Quick Reference
Information Resources
TITLE NUMBER VERSION DATE FORMAT SIZE
Dynamic Block Reed-Solomon Decoder User's Guide
IPUG52 1.6 12/2/2010 PDF 910.8 KB
TITLE NUMBER VERSION DATE FORMAT SIZE
IPexpress Quick Start Guide
8/5/2010 PDF 304.8 KB

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