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Reed-Solomon Encoder/Decoder

This is high-speed Reed-Solomon encoder/decoder core, which is widely used in the error correction of various storage and communication systems.

Introduction

Product NoErasureExternal RAM
Si2520NoNo
Si2520-EYesNo
Si2520-MNoYes
Si2520-EMYesYes

Four kinds of products are selectable to meet different demands.

Features

  • - High-speed encoding/decoding
  • - Support shortened codes
  • - Number of bits per symbol (m) : 3 to 12 bits
  • - Number of symbols in a codeword (n) : 3 to 2m-1 symbols
  • - Number of information symbols (k) : 1 to 2m-3 symbols
  • - Number of correctable symbols (t) : 1 to 2m-1-1 symbols
  • - Primitive polynomial configurable
  • - Generator polynomial configurable
    Reed-Solomon Encoder/Decoder formula
  • - Support erasure correction
  • - No external RAM option
  • - Available limitation of number of correctable symbols
  • - Support continuous encoding / decoding due to pipeline
    (except the case of n<4t+2)
  • - Fully synchronous design using a single clock
  • - ASIC friendly design

Deliverables

  • - Verilog RTL source code
  • - FPGA netlist (Xilinx, Altera, Lattice, etc.)
  • - ASIC netlist (need ASIC cell library)
  • - CPU/DSP source code (C, Assembler) Especially we've got high experience on TI's DSP.
    Test bench and test patterns are also provided.

Gate Count / Performance

  • - TSMC 90nm
    (Constraints : Clock skew 20%, Using wire load model)

    #1: Si2520 (m=4, n=15, k=11, t=2)
    #2: Si2520 (m=8, n=20, k=16, t=2)
    #3: Si2520-M (m=8, n=255, k=239, t=8)
    #4: Si2520-EM (m=8, n=204, k=188, t=8)
Reed-Solomon Encoder/Decoder Graph

Interface

  • - Encoder
    Input
    NameDescription
    ICLKClock
    IXRSTAsynchronous reset
    IDATA[m-1:0]Information symbol
    IDENInformation symbol enable
    Output
    NameDescription
    ORDYReady to input information symbol
    ODATA[m-1:0]Code symbol
    ODENCode symbol enable
  • - Decoder
    Input
    NameDescription
    ICLKClock
    IXRSTAsynchronous reset
    IDATA[m-1:0]Code symbol
    IDENCode symbol enable
    IERSErasure position (*1)
    ILMT[h-1:0]Correctable symbol limitation (*3)
    IRAMRD[m-1:0]External RAM read data (*2)
    • *1 : Only for Si2520-E, Si2520-EM
    • *2 : Only for Si2520-M, Si2520-EM
    • *3 : Only when limitation of number of correctable symbols is used
    Output
    NameDescription
    ORDYReady to input code symbol
    ODATA[m-1:0]Decoded symbol
    ODENDecoded symbol enable
    OFAILDecoding fail flag
    OERRNUM[h-1:0]Number of corrected symbols
    OENDDecoding end flag
    ORAMWA[a-1:0]External RAM write address (*2)
    ORAMWEExternal RAM write enable (*2)
    ORAMWD[m-1:0]External RAM write data (*2)
    ORAMRA[a-1:0]External RAM read address (*2)
    ORAMREExternal RAM read enable (*2)

Applications

  • - Communications (support various standards with RS code)
  • - Hard disk drive(HDD), Optical disc drive(ODD), Solid state drive(SSD)

For more information/customization on Reed-Solomon encoder/decoder, please contact us.

* The content might change without a previous notice due to the improvement.